JP7357271B2 - Lighting devices, disaster prevention lighting equipment, and disaster prevention lighting systems - Google Patents

Description

The present disclosure relates to a lighting device, a disaster prevention lighting device, and a disaster prevention lighting system.

The conventional lighting device described in Patent Document 1 is an emergency light that is turned on in an emergency such as a power outage, and includes an emergency lighting circuit and a secondary battery that is an emergency power source. The emergency lighting circuit uses a secondary battery as a power source to turn on a light source with a constant current in an emergency such as a power outage of an external power source. In such lighting devices, it is required by law to periodically check whether the light source is lit for a predetermined period of time using a secondary battery.

Therefore, when inspecting a conventional lighting device, a light source is turned on by a secondary battery for a predetermined period of time, and the voltage of the secondary battery at that time is detected. Then, the detected voltage of the secondary battery is compared with a threshold value, and the state of the secondary battery is determined based on the comparison result. Some lighting devices have a function of notifying the outside of an abnormality such as the lifespan of a secondary battery by controlling the lighting of a display monitor based on the result of this determination.

JP2018-139222A

In the above-mentioned conventional lighting device, a discharge circuit for discharging the battery (secondary battery) is required for inspection of the battery (secondary battery).

An object of the present disclosure is to provide a lighting device, a disaster prevention lighting device, and a disaster prevention lighting system that allow battery inspection without using a discharge circuit.

A lighting device according to one aspect of the present disclosure includes a lighting circuit, a charging circuit, a voltage detection circuit, and an abnormality detection circuit. The lighting circuit executes emergency lighting in which the light source is turned on using emergency power supplied from a battery when the external power supply is stopped. The charging circuit charges the battery. The voltage detection circuit detects a battery voltage of the battery. The abnormality detection circuit performs an abnormality detection process of detecting an abnormality in the battery based on the battery voltage detected by the voltage detection circuit. The equivalent circuit of the battery includes an ideal voltage source with no internal resistance, a first internal resistance corresponding to a solution resistance, a second internal resistance corresponding to a charge transfer resistance, and a capacitor corresponding to an electric double layer. , the second internal resistance and the capacitor are connected in parallel to form an RC parallel circuit, and the voltage source, the first internal resistance and the RC parallel circuit are connected in series. The abnormality detection circuit performs a charge amount variation process to vary the charging current to the battery, and performs the abnormality detection process based on a state of variation in the battery voltage due to the charge amount variation process. When the abnormality detection circuit performs a charge amount reduction process in which the charging current is reduced as the charge amount variation process, the battery voltage decreases because the voltage drop across the first internal resistance is reduced by the charge amount reduction process. The abnormality detection process is performed based on the fluctuating state at the end timing of the falling first period. When the abnormality detection circuit performs a charging amount increasing process in which the charging current is increased as the charging amount fluctuation process, the abnormality detecting circuit is configured to perform a charging amount increasing process in which the charging current passes through the first internal resistor and the capacitor due to the charging amount increasing process. The abnormality detection process is performed based on the fluctuation state at the end timing of the third period in which the battery voltage rises.

A disaster prevention lighting device according to an aspect of the present disclosure includes the above-described lighting device, a light source that is lit by the output of the lighting device, a battery that supplies emergency power to the lighting device to light the light source, and a main body. and. The lighting device, the light source, and the battery are attached to the main body.

A disaster prevention lighting system according to one aspect of the present disclosure includes the plurality of disaster prevention lighting fixtures described above.

As described above, the present disclosure has the advantage that a battery can be inspected without using a discharge circuit.

FIG. 1 is a block diagram showing the configuration of a disaster prevention lighting fixture including a lighting device according to an embodiment of the present disclosure. FIG. 2 is a waveform diagram showing voltage fluctuations during discharge of a battery included in the above lighting device. FIG. 3 is an enlarged waveform diagram showing the fall of the voltage fluctuation of the lighting device. FIG. 4 is a waveform diagram showing an enlarged rise of the voltage fluctuation of the lighting device.

FIG. 5 is a circuit diagram showing an equivalent circuit of the above battery. FIG. 6 is a characteristic diagram showing the relationship between internal resistance and battery capacity of the same battery. FIG. 7 is a circuit diagram showing the configuration of a DC power supply circuit included in the above lighting device. FIG. 8 is a circuit diagram showing a first specific example of a lighting circuit included in the above lighting device. FIG. 9 is a diagram for explaining the operation of the first specific example. FIG. 10 is a circuit diagram showing a second specific example of a lighting circuit included in the above lighting device. FIG. 11 is a diagram for explaining the operation of the second specific example. FIG. 12A is a top view of the disaster prevention lighting device same as above. FIG. 12B is a bottom view of the disaster prevention lighting device same as above. FIG. 12C is a side view of the disaster prevention lighting device same as above. FIG. 13 is a block diagram showing the configuration of a disaster prevention lighting system according to an embodiment of the present disclosure.

Each figure described in the following embodiments is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual size ratio. Note that the configuration described in the embodiments below is only an example of the present disclosure. The present disclosure is not limited to the following embodiments, and various changes can be made depending on the design etc. as long as the effects of the present disclosure can be achieved.

(1) Outline of Disaster Prevention Lighting Equipment The disaster prevention lighting equipment 1 according to the embodiment is an embedded emergency light that is embedded in an embedded hole provided in the indoor ceiling of a building. However, disaster prevention lighting equipment is not limited to recessed emergency lights. The disaster prevention lighting equipment may be an exposed emergency light that is directly attached to the ceiling, or it may be a disaster prevention lighting equipment other than emergency lights such as a guide light.

The following embodiments generally relate to lighting devices, disaster prevention lighting equipment, and disaster prevention lighting systems. More specifically, the following embodiments relate to a lighting device that turns on a light source in an emergency, a disaster prevention lighting fixture, and a disaster prevention lighting system.

FIG. 1 shows a block configuration of a disaster prevention lighting fixture 1 of this embodiment. The disaster prevention lighting fixture 1 includes a light source 2, a battery 3, and a lighting device 4.

The light source 2 includes a plurality of solid-state light emitting elements. For example, the light source 2 includes an LED array in which a plurality of LEDs (Light Emitting Diodes) are connected in series as a plurality of solid-state light emitting elements. Note that the light source 2 is not limited to having an LED as a solid-state light emitting element. The light source 2 may include, for example, an organic EL (Organic Electro Luminescence, OEL) or other solid state light emitting device such as a semiconductor laser diode (LD).

The battery 3 is a rechargeable storage battery (secondary battery) and corresponds to an emergency power source. Although the battery 3 is not limited to a particular type of secondary battery, it is preferable that the battery 3 is, for example, a nickel-hydrogen battery or a nickel-cadmium battery. The battery 3 can output emergency power by discharging the stored charge during a power outage. That is, the power supplied from the battery 3 during a power outage is emergency power.

The lighting device 4 includes a charging circuit 40, a lighting circuit 41, and a control circuit 42. It is preferable that the lighting device 4 further includes a notification circuit 43 (notification section). Further, it is preferable that the lighting device 4 further includes a DC power supply circuit 45, a power failure detection circuit 46, a receiving section 47, a monitor lamp 48, and a push button switch 49. The lighting device 4 of this embodiment includes three pushbutton switches 49, and when distinguishing the three pushbutton switches 49, they are referred to as pushbutton switches 49A, 49B, and 49C, respectively.

The DC power supply circuit 45 is configured with a switching power supply circuit such as a flyback converter, for example, and converts the AC voltage supplied from the external power supply (for example, a commercial power system) 9 into a DC voltage lower than the effective value of the AC voltage. It is preferable to convert it into The charging circuit 40 is preferably configured to operate when powered by the external power supply 9 and to flow a charging current from the DC power supply circuit 45 to the battery 3 . It is preferable that the lighting circuit 41 is configured to constant current the DC current supplied from the battery 3 and supply it to the light source 2 . The power outage detection circuit 46 is configured to detect a power outage in the external power supply 9 from the output voltage of the DC power supply circuit 45 and notify the control circuit 42 of the detected power outage. The external power supply 9 is a 100V or 200V commercial power system.

Charging circuit 40 is controlled by control circuit 42 . When the charging circuit 40 is supplied with power from the external power source 9 and is instructed to perform charging by the control circuit 42, the charging circuit 40 supplies a charging current to the battery 3 to charge the battery 3. When the charging circuit 40 is instructed to stop charging by the control circuit 42, the charging circuit 40 reduces the charging current to zero and stops charging the battery 3. At least when the amount of electricity stored in the battery 3 reaches a predetermined amount or more, the charging circuit 40 performs trickle charging in which a small amount of charging current continues to flow in order to compensate for self-discharge. The charging current for trickle charging is approximately C/20 to C/30 with respect to the rated current of the battery 3 of 1C.

The monitor lamp 48 is composed of, for example, a light emitting diode that emits green light. The receiving unit 47 is configured to receive a wireless signal using infrared rays as a communication medium, demodulate a transmission frame from the received wireless signal, and pass the demodulated frame to the control circuit 42 . This wireless signal is transmitted from a wireless transmitter operated by an inspector who performs periodic inspections, user inspections, and the like.

Note that periodic inspections are carried out at intervals stipulated by law, and are performed by forcibly operating the lighting circuit 41 and discharging the battery 3 for a specified period of time to ensure that the illuminance of the floor surface provided by the light source 2 is maintained. The purpose is to confirm whether The purpose of the user inspection is to stop charging the battery 3 and check the degree of deterioration of the battery 3.

The notification circuit 43 is a notification section having a notification function, and includes, for example, a monochrome display element 431, a sounding part 432 such as a piezoelectric sounder, and a drive circuit 433 that drives the display element 431 and the sounding part 432. The drive circuit 433 drives the display element 431 to emit light, and drives the sound generating section 432 to generate sound. Note that the notification circuit 43 may use the monitor lamp 48 as a display element.

The control circuit 42 is configured to have the following functions: a voltage detection circuit 421, an abnormality detection circuit 422, an abnormality timer 423, a power supply timer 424, an inspection timer 425, an appliance timer 426, a notification control circuit 427, and an inspection control circuit 428. ing.

The control circuit 42 operates by being supplied with power from the external power supply 9, the battery 3, or the control power supply. Preferably, control circuit 42 comprises a computer system. A computer system mainly consists of a processor and a memory as hardware. At least part of the function of the control circuit 42 in the present disclosure is realized by the processor executing a program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, provided through a telecommunications line, or recorded on a non-transitory storage medium readable by the computer system, such as a memory card, optical disc, or hard disk drive. may be provided. A processor of a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits such as IC or LSI referred to herein have different names depending on the degree of integration, and include integrated circuits called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Furthermore, an FPGA (Field-Programmable Gate Array), which is programmed after the LSI is manufactured, or a logic device that can reconfigure the connections inside the LSI or reconfigure the circuit sections inside the LSI, may also be used as a processor. I can do it. The plurality of electronic circuits may be integrated into one chip, or may be provided in a distributed manner over a plurality of chips. A plurality of chips may be integrated into one device, or may be distributed and provided in a plurality of devices. A computer system herein includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including semiconductor integrated circuits or large-scale integrated circuits.

The control circuit 42 is configured to operate the charging circuit 40 when the power outage detection circuit 46 does not detect a power outage. Further, the control circuit 42 is configured to stop the charging circuit 40 and supply emergency power from the battery 3 to the lighting circuit 41 when the power outage detection circuit 46 detects a power outage. The lighting circuit 41 supplied with the emergency power executes emergency lighting to light the light source 2 with the emergency power. Furthermore, regardless of the state of charge of the battery 3, the charging circuit 40 may be stopped and the lighting circuit 41 may be operated to cause the light source 2 to be constantly lit (for example, fully lit). Further, if the amount of charge in the charging circuit 40 is sufficiently smaller than the amount of discharge to the lighting circuit 41 (for example, trickle charging), the lighting circuit 41 is operated without stopping the charging circuit 40, and the light source 2 is turned on steadily (for example, at full capacity). (lights up) in some cases.

Furthermore, when the pushbutton switch 49A is pressed or when the transmission frame of the periodic inspection signal is received from the receiving section 47, the control circuit 42 determines that there has been an instruction for periodic inspection from an inspector or the like. If the battery 3 is fully charged, the control circuit 42 stops the charging circuit 40 and operates the lighting circuit 41 to discharge the battery 3 for a predetermined period of time. configured to perform inspections; If the battery 3 is not fully charged, the control circuit 42 first operates the charging circuit 40 to bring the battery 3 to a fully charged state, and then stops the charging circuit 40 for a predetermined period of time. In addition, the lighting circuit 41 is operated to discharge the battery 3, and periodic inspections are performed. Further, if the battery 3 is not fully charged, the control circuit 42 operates the charging circuit 40 to charge the battery 3 and operates the lighting circuit 41 for a predetermined period of time to charge the battery 3. may be discharged. Furthermore, regardless of the state of charge of the battery 3, the charging circuit 40 may be stopped and the lighting circuit 41 may be operated to cause the light source 2 to be constantly lit (for example, fully lit). Further, if the amount of charge in the charging circuit 40 is sufficiently smaller than the amount of discharge to the lighting circuit 41 (for example, trickle charging), the lighting circuit 41 is operated without stopping the charging circuit 40, and the light source 2 is turned on steadily (for example, at full capacity). (lights up) in some cases. Note that it is not essential to discharge the battery 3 when performing the periodic inspection, and the periodic inspection may be performed without discharging the battery 3.

When the pushbutton switch 49B is pressed, the control circuit 42 stops the operation of the charging circuit 40, supplies the discharged power of the battery 3 to the lighting circuit 41, and lights the lighting circuit 41 with the discharged power of the battery 3. Confirm the emergency lighting by operating it for seconds.

When the push button switch 49C is pressed, or when the transmission frame of the user inspection signal is received from the receiving unit 47, the control circuit 42 determines that there is an instruction for user inspection from an inspector or the like. The control circuit 42 is configured to stop the charging circuit 40, execute a charging amount variation process to vary the charging current of the battery 3, and perform user inspection.

(2) User Inspection At the time of user inspection, the abnormality detection circuit 422 performs charge amount variation processing to vary the charging current to the battery 3 when the charging circuit 40 is trickle charging the battery 3, and An abnormality detection process is performed to detect an abnormality in the battery 3 based on the fluctuation state of the battery voltage Vb. Note that the charging amount variation process includes a charging amount decreasing process that reduces the charging current, and a charging amount increasing process that increases the charging current. The charging amount reduction process includes a process of reducing the charging current to 0 (zero), and a process of reducing the charging current to a value lower than the current value and larger than 0 (zero). The charging amount increasing process includes a process of increasing the charging current from 0 (zero) and a process of increasing the charging current to a value higher than the current value.

Therefore, the lighting device 4 does not need to use a discharge circuit for discharging the battery 3 for abnormality detection processing, and can inspect the battery 3 without using a discharge circuit. Further, the light source 2 is not turned on due to the abnormality detection process. That is, the configuration of the lighting device 4 required for user inspection can be simplified, and changes in the lighting environment due to user inspection can be prevented.

Each method of abnormality detection processing will be explained below.

(2-1) First abnormality detection process First, the characteristics of the battery 3 will be explained using FIGS. 2 to 5.

The voltage detection circuit 421 is electrically connected to the positive and negative electrodes of the battery 3. Then, the voltage detection circuit 421 performs AD conversion on the analog value of the battery voltage Vb, which is the voltage across the battery 3, and delivers data of the detected value representing the battery voltage Vb as a digital value to the abnormality detection circuit 422. That is, the voltage detection circuit 421 detects the battery voltage Vb and delivers data of the detected value |Vb| of the battery voltage Vb to the abnormality detection circuit 422.

FIG. 2 shows an example of the amount of variation in the battery voltage Vb during discharging using characteristics X1 to X8. Characteristics X1 to X8 set the discharge current value of battery 3 to each C rate of 0.1C, 0.2C, 0.3C, 0.4C, 0.5C, 0.6C, 0.8C, and 1C, respectively. This shows the change in battery voltage Vb over time. When the fully charged battery 3 is discharged at a C rate of 1C, the battery voltage Vb decreases to the discharge end voltage one hour after the start of discharge, and the battery 3 becomes completely discharged. In FIG. 2, when discharging is started at time t1, battery voltage Vb drops sharply at time t1, and then gradually declines over time until time t2 when discharging stops. Then, the battery voltage Vb rises sharply at time t2. During the discharge period T1 from time t1 to t2, the greater the value of the discharge current (the greater the C rate), the greater the amount of decrease in the battery voltage Vb. Note that the discharge period T1 in FIG. 2 is about 10 seconds. Further, the end-of-discharge voltage of each of the plurality of battery cells included in the battery 3 is, for example, about 1V.

FIG. 2 shows fluctuations in the battery voltage Vb due to the start and stop of discharging the battery 3. However, when the charging circuit 40 stops and starts trickle charging the battery 3, the battery voltage Vb similarly fluctuates. 3 and 4 show the variation in battery voltage Vb due to stop and start of trickle charging as a characteristic X10.

FIG. 3 shows the characteristic X10 near time t10 when trickle charging of the battery 3 is stopped. When trickle charging is stopped at time t10, battery voltage Vb sharply falls during a first period T11 from time t10 to time t11. During the second period T12 from time t11 to time t12, battery voltage Vb decreases with a gradually decreasing slope. After time t12, the amount of electricity stored in the battery 3 decreases with the passage of time, and the battery voltage Vb gradually decreases. In FIG. 3, the amount of decrease in battery voltage Vb during the first period T11 is assumed to be ΔVb11. Further, the amount of decrease in battery voltage Vb during the second period T12 is assumed to be ΔVb12.

FIG. 4 shows the characteristic X10 around time t20 when trickle charging of the battery 3 was started. When trickle charging is started at time t20, the battery voltage Vb rises steeply during a third period T21 from time t20 to time t21. The battery voltage Vb increases while gradually decreasing the slope in the fourth period T22 from time t21 to time t22. After time t22, battery voltage Vb converges to a predetermined value while gradually increasing as time passes. In FIG. 4, the amount of increase in battery voltage Vb during the third period T21 is ΔVb21. Further, the amount of increase in battery voltage Vb during the fourth period T22 is assumed to be ΔVb22.

FIG. 5 shows an equivalent circuit of the battery 3. The equivalent circuit of the battery 3 includes an ideal voltage source 3a with no internal resistance, a first internal resistance 3b equivalent to solution resistance, a second internal resistance 3c equivalent to charge transfer resistance, and a capacitor 3d equivalent to an electric double layer. Consists of. The second internal resistance 3c and the capacitor 3d are connected in parallel to form an RC parallel circuit 3e, and the voltage source 3a, the first internal resistance 3b, and the RC parallel circuit 3e are connected in series. The battery voltage Vb is the voltage across a series circuit of the voltage source 3a, the first internal resistor 3b, and the RC parallel circuit 3e.

Then, in the first period T11 (see FIG. 3) immediately after charging is stopped, the voltage drop across the first internal resistor 3b suddenly becomes zero, and the battery voltage Vb falls sharply. In the second period T12 (see FIG. 3), the capacitor 3d discharges, and the battery voltage Vb decreases with a gradually decreasing slope. Thereafter, the battery voltage Vb gradually decreases due to self-discharge of the battery 3.

Further, in the third period T21 (see FIG. 4) immediately after the start of charging, the charging current mainly passes through the first internal resistor 3b and the capacitor 3d, and the battery voltage Vb rises steeply. In the fourth period T22 (see FIG. 4), the charging current mainly passes through the first internal resistance 3b and the second internal resistance 3c, and the battery voltage Vb increases while gradually decreasing the slope. Thereafter, the battery voltage Vb converges to a predetermined value while gradually increasing.

FIG. 6 shows the relationship between the capacity of the battery 3 (battery capacity) and the resistance value of the first internal resistor 3b. As the usage time of the battery 3 passes, the battery 3 deteriorates and the capacity of the battery 3 decreases. Then, as the capacity of the battery 3 decreases, the resistance value of the first internal resistor 3b increases. That is, the resistance value of the first internal resistance 3b increases as the battery 3 deteriorates.

Therefore, the abnormality detection circuit 422 that performs the first abnormality detection process instructs the charging circuit 40 that is trickle charging the battery 3 to stop charging. As a result, the charging current of the battery 3 decreases to 0, and a fall in the battery voltage Vb (voltage drop across the first internal resistor 3b) occurs. The abnormality detection circuit 422 can detect an abnormality in the battery 3 based on the fall of the battery voltage Vb. In this case, the charge amount variation process is a charge amount reduction process that reduces the charging current to the battery 3. Further, the fluctuation state of the detected value |Vb| due to the charge amount fluctuation process is a decreasing state of the detected value |Vb|, and the detected value |Vb| after the charge amount fluctuation process is started, or This is the amount of decrease (amount of variation) in the detected value |Vb|.

For example, the abnormality detection circuit 422 detects the detected value |Vb| when the battery voltage Vb falls due to the stoppage of charging of the battery 3, or the detected value |Vb| before and after the battery voltage Vb falls due to the stoppage of the charge of the battery 3. Abnormality detection processing is performed based on the amount of decrease (amount of variation). In other words, the abnormality detection circuit 422 uses the detected value |Vb| after the battery voltage Vb falls, or the amount of decrease in the detected value |Vb| before and after the battery voltage Vb falls, as the state of decrease in the detected value |Vb| Use. Specifically, "when the battery voltage Vb falls due to the stoppage of charging of the battery 3" is time t11, which is the end timing of the first period T11, and the detected value |Vb| at time t11 is the detected value |Vb11 | (see Figure 3). “The amount of decrease in the detected value |Vb| before and after the battery voltage Vb falls due to the stoppage of charging of the battery 3” is the amount of decrease ΔVb11 in the first period T11 (see FIG. 3). Then, the abnormality detection circuit 422 performs abnormality detection processing based on the detected value |Vb11| or the decrease amount ΔVb11.

The length of the first period T11 is approximately equal to a design value determined by the specifications of the battery 3. When the control circuit 42 includes an RTC (Real Time Clock), the abnormality detection circuit 422 periodically reads the value of the RTC and integrates the count value, thereby determining the time period during which charging by the charging circuit 40 has stopped. It is preferable to perform a timing operation to measure the time elapsed from t10. Alternatively, the abnormality detection circuit 422 may include a counter that measures the elapsed time from time t10 by incrementing the count value at a constant cycle (for example, the cycle of a clock frequency). The abnormality detection circuit 422 starts a timing operation at time t10, which is the timing at which the charging circuit 40 is instructed to stop charging.

The abnormality detection circuit 422 performs abnormality detection processing based on the detected value |Vb11| as follows.

The abnormality detection circuit 422 sets the timing at which it instructs the charging circuit 40 to stop charging to be time t10. When the elapsed time from time t10 reaches the design value, the abnormality detection circuit 422 considers that it is the end timing of the first period T11 (time t11), and converts the detected value |Vb| at this time into the detected value |Vb11| shall be. The abnormality detection circuit 422 compares the detected value |Vb11| with a threshold value K1 (see FIG. 3). That is, the abnormality detection circuit 422 determines whether [|Vb11|<K1]. If the detected value |Vb11| is less than the threshold value K1, the abnormality detection circuit 422 determines that the battery 3 is deteriorating and detects an abnormality in the battery 3. If the detected value |Vb11| is equal to or greater than the threshold value K1, the abnormality detection circuit 422 determines that the battery 3 is normal and does not detect an abnormality in the battery 3.

Further, the abnormality detection circuit 422 performs abnormality detection processing based on the amount of decrease ΔVb11 as follows.

The abnormality detection circuit 422 sets the timing at which the charging circuit 40 is instructed to stop charging to be time t10, and sets the detected value |Vb| at time t10 to |Vb10|. When the elapsed time from time t10 reaches the design value, the abnormality detection circuit 422 considers that it is the end timing of the first period T11 (time t11), and converts the detected value |Vb| at this time into the detected value |Vb11| shall be. The abnormality detection circuit 422 obtains a value obtained by subtracting the detected value |Vb11| at time t11 from the detected value |Vb10| at time t10 as the amount of decrease ΔVb11.

Then, the abnormality detection circuit 422 compares the amount of decrease ΔVb11 with the threshold value ΔK1. That is, the abnormality detection circuit 422 determines whether [ΔVb11>ΔK1]. If the amount of decrease ΔVb11 exceeds the threshold value ΔK1, the abnormality detection circuit 422 determines that the battery 3 is deteriorating and detects an abnormality in the battery 3. If the amount of decrease ΔVb11 is less than the threshold value ΔK1, the abnormality detection circuit 422 determines that the battery 3 is normal and does not detect an abnormality in the battery 3.

When the abnormality detection process is completed, the abnormality detection circuit 422 stops the charge amount reduction process of the charging circuit 40 and causes the charging circuit 40 to resume trickle charging.

It is preferable that the abnormality detection circuit 422 sets the execution period of the above-mentioned abnormality detection process to about 1 to 10 msec. That is, the abnormality detection circuit 422 checks the degree of deterioration of the battery 3 based on the fall of the battery voltage Vb (voltage drop of the first internal resistor 3b) in the first period T11, thereby reducing the amount of time required for the abnormality detection process. time can be shortened. Therefore, a decrease in the capacity of the battery 3 and deterioration of the battery 3 due to the abnormality detection process can be suppressed.

(2-2) Second Abnormality Detection Process The abnormality detection circuit 422 that performs the second abnormality detection process instructs the charging circuit 40 that is trickle charging the battery 3 to stop charging. As a result, the charging current of the battery 3 decreases to 0, and after the battery voltage Vb drops, the battery voltage Vb further decreases due to self-discharge or the like. Then, the abnormality detection circuit 422 performs abnormality detection processing based on the decreasing state of the detected value |Vb| after time t12. In this case, the charge amount variation process is a charge amount reduction process that reduces the charging current to the battery 3. Further, the fluctuation state of the detected value |Vb| due to the charge amount fluctuation process is a decreasing state of the detected value |Vb|, and the detected value |Vb| after the charge amount fluctuation process is started, or This is the amount of decrease (amount of variation) in the detected value |Vb|.

For example, the abnormality detection circuit 422 detects the detected value |Vb| after the battery voltage Vb decreases due to the stoppage of charging of the battery 3, or the decrease in the detected value |Vb| before and after the battery voltage Vb decreases due to the stoppage of the charge of the battery 3. Anomaly detection processing is performed based on the amount (amount of variation).

The abnormality detection circuit 422 performs abnormality detection processing based on the detected value |Vb| as follows.

When the elapsed time from time t10 reaches specified time tc1 (see FIG. 3) (time t13), the abnormality detection circuit 422 sets the detected value |Vb| at this time as the detected value |Vb13|. The abnormality detection circuit 422 compares the detected value |Vb13| with a threshold value K11 (see FIG. 3). That is, the abnormality detection circuit 422 determines whether [|Vb13|<K11]. If the detected value |Vb13| is less than the threshold value K11, the abnormality detection circuit 422 determines that the battery 3 is deteriorating and detects an abnormality in the battery 3. If the detected value |Vb13| is equal to or greater than the threshold value K11, the abnormality detection circuit 422 determines that the battery 3 is normal and does not detect an abnormality in the battery 3. Note that the specified time tc1 is, for example, about one week, and is a value that is after the time t12 so that the time t13 is not included in the first period T11 and the second period T12.

Further, the abnormality detection circuit 422 performs abnormality detection processing based on the amount of decrease in the detected value |Vb| as follows.

When the elapsed time from time t10 reaches specified time tc1 (time t13), the abnormality detection circuit 422 sets the detected value |Vb| at this time as the detected value |Vb13|. The abnormality detection circuit 422 obtains a value obtained by subtracting the detected value |Vb13| at time t13 from the detected value |Vb10| at time t10 as the amount of decrease ΔVb13.

Then, the abnormality detection circuit 422 compares the amount of decrease ΔVb13 with a threshold value ΔK13. That is, the abnormality detection circuit 422 determines whether [ΔVb13>ΔK13]. If the decrease amount ΔVb13 exceeds the threshold value ΔK13, the abnormality detection circuit 422 determines that the battery 3 is deteriorating and detects an abnormality in the battery 3. If the amount of decrease ΔVb13 is less than or equal to the threshold value ΔK13, the abnormality detection circuit 422 determines that the battery 3 is normal and does not detect an abnormality in the battery 3.

When the abnormality detection process is completed, the abnormality detection circuit 422 stops the charge amount reduction process of the charging circuit 40 and causes the charging circuit 40 to resume charging.

(2-3) Third abnormality detection process The abnormality detection circuit 422 that performs the third abnormality detection process instructs the charging circuit 40 that is trickle charging the battery 3 to stop charging. As a result, the charging current of the battery 3 decreases to 0, and after the battery voltage Vb drops, the battery voltage Vb further decreases due to self-discharge or the like. Then, the abnormality detection circuit 422 performs abnormality detection processing based on the rate of decrease of the detected value |Vb| after charging is stopped. In this case, the charge amount variation process is a charge amount reduction process that reduces the charging current to the battery 3. Further, the fluctuation state of the detected value |Vb| due to the charge amount fluctuation process is a decreasing state of the detected value |Vb|, and the rate of decrease (fluctuation speed) of the detected value |Vb| after the charge amount fluctuation process is started. It is.

For example, the abnormality detection circuit 422 determines, as the rate of decrease of the detected value |Vb|, the time from time t10 when charging of the battery 3 is stopped until the detected value |Vb| decreases to the threshold value K12 (see FIG. 3). The time is measured as the drop time. The abnormality detection circuit 422 compares the drop time with a threshold value tc2 (see FIG. 3). If the drop time is less than the threshold tc2, the abnormality detection circuit 422 determines that the battery 3 is deteriorating and detects an abnormality in the battery 3. If the drop time is equal to or greater than the threshold value tc2, the abnormality detection circuit 422 determines that the battery 3 is normal and does not detect an abnormality in the battery 3.

In this case, the abnormality detection circuit 422 determines whether the elapsed time after starting the charge amount reduction process reaches the threshold tc2 (first threshold) or the detected value |Vb| has decreased to the threshold K12 (second threshold). For example, the abnormality detection process is completed and the charge amount reduction process is stopped. After stopping the charge amount reduction process, the abnormality detection circuit 422 starts (resumes) charging (trickle charging if necessary) of the charging circuit 40.

(2-4) Fourth abnormality detection process In the third period T21 (see FIG. 4) immediately after the start of charging, a voltage drop across the first internal resistor 3b occurs sharply, and the battery voltage Vb rises sharply. After that, in the fourth period T22 (see FIG. 4), the capacitor 3d is charged, and the battery voltage Vb increases while gradually decreasing the slope.

Therefore, the charge amount variation process may be a charge amount increase process that increases the charging current to the battery 3. In this case, the fluctuation state of the detected value |Vb| due to the charge amount fluctuation process is an increasing state of the detected value |Vb|, and the detected value |Vb| after the charge amount fluctuation process is started, or the state of change of the detected value |Vb| after the charge amount fluctuation process is started. is the amount of variation (amount of increase) in the detected value |Vb|.

That is, the abnormality detection circuit 422 that performs the fourth abnormality detection process instructs the charging circuit 40, which has stopped charging the battery 3, to start (resume) trickle charging, and causes the battery voltage Vb to rise. bring about The abnormality detection circuit 422 can detect an abnormality in the battery 3 based on the rise of the battery voltage Vb (voltage drop across the first internal resistor 3b).

For example, the abnormality detection circuit 422 detects the detected value |Vb| when the battery voltage Vb rises due to the start of charging of the battery 3, or the amount of increase in the detected value |Vb| before and after the battery voltage Vb rises due to the start of charging of the battery 3. Anomaly detection processing is performed based on (amount of variation). Specifically, "when the battery voltage Vb rises due to the start of charging of the battery 3" is time t21, which is the end timing of the third period T21, and the detected value |Vb| at time t21 is the detected value |Vb21| (See Figure 4). “The amount of increase in the detected value |Vb| before and after the battery voltage Vb rises due to the start of charging of the battery 3” is the amount of increase ΔVb21 in the third period T21 (see FIG. 4). Then, the abnormality detection circuit 422 performs abnormality detection processing based on the detected value |Vb21| or the increase amount ΔVb21.

The abnormality detection circuit 422 performs abnormality detection processing based on the detected value |Vb21| as follows.

The abnormality detection circuit 422 sets the timing at which the charging circuit 40 is instructed to start charging as time t20. When the elapsed time from time t20 reaches the design value, the abnormality detection circuit 422 assumes that it is the end timing (time t21) of the third period T21, and converts the detected value |Vb| at this time into the detected value |Vb21| shall be. The abnormality detection circuit 422 compares the detected value |Vb21| with a threshold value K2 (see FIG. 4). That is, the abnormality detection circuit 422 determines whether [|Vb21|>K2]. If the detected value |Vb21| exceeds the threshold value K2, the abnormality detection circuit 422 determines that the battery 3 is deteriorating and detects an abnormality in the battery 3. If the detected value |Vb21| is less than or equal to the threshold value K2, the abnormality detection circuit 422 determines that the battery 3 is normal and does not detect an abnormality in the battery 3.

Further, the abnormality detection circuit 422 performs abnormality detection processing based on the increase amount ΔVb21 as follows.

The abnormality detection circuit 422 sets the timing at which the charging circuit 40 is instructed to start charging to be time t20, and sets the detected value |Vb| at time t20 to |Vb20|. The abnormality detection circuit 422 obtains the increase amount ΔVb21 by subtracting the detected value |Vb20| at time t20 from the detected value |Vb21| at time t21.

Then, the abnormality detection circuit 422 compares the increase amount ΔVb21 with the threshold value ΔK2. That is, the abnormality detection circuit 422 determines whether [ΔVb21>ΔK2]. If the increase amount ΔVb21 exceeds the threshold value ΔK2, the abnormality detection circuit 422 determines that the battery 3 is deteriorating and detects an abnormality in the battery 3. If the increase amount ΔVb21 is less than or equal to the threshold value ΔK2, the abnormality detection circuit 422 determines that the battery 3 is normal and does not detect an abnormality in the battery 3.

(2-5) Fifth abnormality detection process The abnormality detection circuit 422 that performs the fifth abnormality detection process instructs the charging circuit 40 that has stopped charging the battery 3 to start (restart) trickle charging. do. Then, the abnormality detection circuit 422 performs abnormality detection processing based on the increasing state of the detected value |Vb| after time t22. In this case, the charge amount variation process is a charge amount increase process that increases the charging current to the battery 3. Further, the fluctuation state of the detected value |Vb| due to the charge amount fluctuation processing is an increasing state of the detected value |Vb|, and the detected value |Vb| after the charge amount fluctuation processing is started, or the fluctuation state of the detected value |Vb| by the charge amount fluctuation processing This is the amount of increase (amount of variation) in the detected value |Vb|.

For example, the abnormality detection circuit 422 detects the detected value |Vb| after the battery voltage Vb increases due to the start of charging of the battery 3, or the increase in the detected value |Vb| before and after the battery voltage Vb increases due to the start of charging of the battery 3. Anomaly detection processing is performed based on the amount (amount of change).

The abnormality detection circuit 422 performs abnormality detection processing based on the detected value |Vb| as follows.

When the elapsed time from time t20 reaches the specified time td1 (see FIG. 4) (time t23), the abnormality detection circuit 422 sets the detected value |Vb| at this time as the detected value |Vb23|. The abnormality detection circuit 422 compares the detected value |Vb23| with a threshold value K21 (see FIG. 4). That is, the abnormality detection circuit 422 determines whether [|Vb23|>K21]. If the detected value |Vb23| exceeds the threshold value K21, the abnormality detection circuit 422 determines that the battery 3 is deteriorating and detects an abnormality in the battery 3. If the detected value |Vb23| is less than or equal to the threshold value K21, the abnormality detection circuit 422 determines that the battery 3 is normal and does not detect an abnormality in the battery 3. Note that the specified time td1 is a time after time t22 so as not to be included in the third period T21 and the fourth period T22, and is, for example, about one week.

Further, the abnormality detection circuit 422 performs abnormality detection processing based on the amount of increase in the detected value |Vb| as follows.

When the elapsed time from time t20 reaches specified time td1 (time t23), the abnormality detection circuit 422 sets the detected value |Vb| at this time as the detected value |Vb23|. The abnormality detection circuit 422 obtains the increase amount ΔVb23 by subtracting the detected value |Vb20| at time t20 from the detected value |Vb23| at time t23.

Then, the abnormality detection circuit 422 compares the increase amount ΔVb23 with the threshold value ΔK23. That is, the abnormality detection circuit 422 determines whether [ΔVb23>ΔK23]. If the increase amount ΔVb23 exceeds the threshold value ΔK23, the abnormality detection circuit 422 determines that the battery 3 is deteriorating and detects an abnormality in the battery 3. If the increase amount ΔVb23 is less than or equal to the threshold value ΔK23, the abnormality detection circuit 422 determines that the battery 3 is normal and does not detect an abnormality in the battery 3.

(2-6) Sixth abnormality detection process The abnormality detection circuit 422 that performs the sixth abnormality detection process instructs the charging circuit 40 that has stopped charging the battery 3 to start (restart) trickle charging. do. The abnormality detection circuit 422 then performs abnormality detection processing based on the rate of increase in the detected value |Vb| after the start of charging. In the sixth abnormality detection process, the time from when the charge amount increase process is started until the detected value |Vb| increases to the threshold value is used as the rate of increase in the detected value |Vb|. In this case, the charge amount variation process is a charge amount increase process that increases the charging current to the battery 3. Further, the fluctuation state of the detected value |Vb| due to the charge amount fluctuation process is an increasing state of the detected value |Vb|, and the rate of increase (fluctuation speed) of the detected value |Vb| after the charge amount fluctuation process is started. It is.

(2-7) Charging after abnormality detection processing In each of the above-mentioned abnormality detection processing (2-1) to (2-3), after the charging amount reduction processing is completed, the charging circuit 40 continues charging for a predetermined charging period. It is preferable to charge the battery 3 using the same method. The charging period is a period during which at least the detected value |Vb| returns to the value immediately before the charge amount reduction process. Therefore, after the user's inspection, the lighting device 4 can restore the remaining capacity of the battery 3 to the value immediately before the charge amount reduction process.

For example, the control circuit 42 stores the data of the detected value |Vb| immediately before the charge amount reduction process is started as the return value data. When the charge amount reduction process is completed, the control circuit 42 causes the charging circuit 40 to start charging the battery 3 (trickle charging if necessary). The control circuit 42 causes the charging circuit 40 to continue charging the battery 3 until the detected value |Vb| increases during charging and reaches the return value. The control circuit 42 causes the charging circuit 40 to stop charging the battery 3 when the detected value |Vb| during charging reaches the return value.

Further, the control circuit 42 may set the time length of the charging period to be the same as the period length of the charge amount reduction process.

(2-8) Automatic execution of abnormality detection processing The abnormality timer 423 counts a period in which abnormality detection processing is not performed as an undetermined period. It is preferable that the abnormality detection circuit 422 performs the abnormality detection process after the time value of the undetermined period reaches a predetermined determination value. Therefore, the abnormality detection circuit 422 can periodically and automatically perform abnormality detection processing even without a user inspection instruction from an inspector or the like. The determination value is set, for example, so that the execution cycle of the abnormality detection process is shorter than the cycle of periodic inspection.

Furthermore, the abnormality timer 423 is reset when a user inspection is performed or when the battery 3 is replaced, and the time count becomes zero. In this embodiment, the inspector or administrator simultaneously presses the push button switches 49B and 49C after the user inspection and after replacing the battery 3. The control circuit 42 resets the abnormality timer 423 when the pushbutton switches 49B and 49C are pressed simultaneously. Alternatively, when the abnormality detection circuit 422 executes the abnormality detection process, the control circuit 42 may reset the abnormality timer 423. Alternatively, when the battery 3 is replaced, the control circuit 42 may reset the abnormality timer 423 similarly to the power supply timer 424 described below.

(2-9) User Inspection Notification Process The notification circuit 43 notifies the abnormality of the battery 3 detected by the abnormality detection circuit 422. That is, when the abnormality detection circuit 422 detects an abnormality in the battery 3, the drive circuit 433 notifies the battery abnormality by lighting or blinking the display element 431. Furthermore, when the abnormality detection circuit 422 detects an abnormality in the battery 3, the drive circuit 433 may notify the battery abnormality by outputting a sound from the sound generating section 432. The sound output by the sound generating unit 432 is, for example, a message notifying an abnormality in the battery 3, "An abnormality in the battery 3 has been detected. We recommend replacing the battery 3.", or a buzzer sound. The battery abnormality notification in this embodiment refers to notification that notifies a person that the battery 3 is abnormal and urges the person to replace the battery 3.

(3) Specific example of DC power supply circuit FIG. 7 shows a circuit using a flyback converter as a specific example of the DC power supply circuit 45. The DC power supply circuit 45 mainly includes a rectifier DB1, an input capacitor C1, a transformer Tr1, an intelligent power device IC1, a diode D3, and an output capacitor C6.

The rectifier DB1 has a plurality of full-bridge connected diodes, and performs full-wave rectification of the AC voltage of the external power supply 9. An input capacitor C1 is connected between the output terminals of the rectifier DB1. Input capacitor C1 smoothes the rectified voltage output by rectifier DB1. A series circuit of the primary winding N1 of the transformer Tr1 and the intelligent power device IC1 is connected between both ends of the input capacitor C1.

The intelligent power device IC1 in FIG. 7 is, for example, MIP0222 manufactured by Panasonic Corporation. The intelligent power device IC1 includes an N-channel enhancement type power MOSFET (Metal Oxide Semiconductor Field Effect Transistor) and an internal circuit that controls the power MOSFET. The internal circuit includes an error amplifier, an oscillator, a flip-flop, a gate driver, a startup power supply, and the like. Note that the drain of the power MOSFET built in the intelligent power device IC1 is connected to the drain terminal P1 of the intelligent power device IC1. Further, the source of the power MOSFET is connected to the source terminal P2 of the intelligent power device IC1. The internal circuit is connected to the control terminal P3 of the intelligent power device IC1.

A first end of the primary winding N1 is connected to the positive terminal of the input capacitor C1. The drain terminal P1 of the intelligent power device IC1 is connected to the second end of the primary winding N1. The source terminal P2 of the intelligent power device IC1 is connected to the negative terminal of the input capacitor C1.

A snubber circuit including a diode D1, a resistor R1, and a capacitor C2 is connected between both ends (first end and second end) of the primary winding N1. The anode of the diode D1 is connected to the drain terminal P1 (the second end of the primary winding N1), and the cathode of the diode D1 is connected to the positive pole of the input capacitor C1 (the first end of the primary winding N1) through the resistor R1. ). A capacitor C2 is connected in parallel to the resistor R1.

A series circuit of a diode D3 and an output capacitor C6 is connected between both ends of the secondary winding N2 of the transformer Tr1. The anode of diode D3 is connected to the first end of secondary winding N2, and the cathode of diode D3 is connected to the positive terminal of output capacitor C6. The negative pole of output capacitor C6 is connected to the second end of secondary winding N2.

Then, when the power MOSFET of the intelligent power device IC1 is turned on, current flows through the primary winding N1 and energy is stored. When the power MOSFET is turned off, the energy stored in the primary winding N1 is output from the secondary winding N2 through the diode D3, and a DC normal voltage Vd1 is generated across the output capacitor C6. That is, by turning on and off the intelligent power device IC1 (its power MOSFET), a common voltage Vd1 is generated across the output capacitor C6.

The DC power supply circuit 45 controls the value of the common voltage Vd1 to a predetermined value by feeding back the common voltage Vd1 and controlling the switching of the intelligent power device IC1.

Specifically, a series circuit of a resistor R6 and a resistor R7 is connected between both ends of the output capacitor C6. A connection point between resistor R6 and resistor R7 is connected to a control terminal of shunt regulator SR1. The cathode of shunt regulator SR1 is connected to the positive terminal of output capacitor C6 via a series circuit of resistor R4 and resistor R5. A series circuit of a resistor R8 and a capacitor C7 is connected between the cathode of the shunt regulator SR1 and the control terminal. The input diode of the photocoupler PC1 is connected in parallel to the resistor R5.

Furthermore, a series circuit of a diode D2, a resistor R2, and a capacitor C3 is connected between both ends of the tertiary winding N3 of the transformer Tr1. A series circuit consisting of the output transistor of the photocoupler PC1, a resistor R3, and a capacitor C4 is connected between both ends of the capacitor C3. A capacitor C5 is connected in parallel to the series circuit of the resistor R3 and the capacitor C4. The positive electrode of capacitor C5 is connected to control terminal P3 of intelligent power device IC1, and the negative electrode of capacitor C5 is connected to source terminal P2 of intelligent power device IC1.

When starting up the DC power supply circuit 45, a starting current is supplied from the drain terminal P1 of the intelligent power device IC1 to the internal circuit, and the starting current flows into the capacitor C5 through the control terminal P3. When the voltage of the capacitor C5 exceeds the starting voltage, the power MOSFET starts oscillating and at the same time the current supply from the drain terminal P1 is cut off. After the power MOSFET starts oscillating, the capacitor C3 is charged by the induced voltage in the tertiary winding N3.

When the value of the common voltage Vd1 exceeds the reference voltage inside the shunt regulator SR1, conduction occurs between the anode and cathode of the shunt regulator SR1, current flows through the input diode of the photocoupler PC1, and the output transistor of the photocoupler PC1 Turn on. When the output transistor of the photocoupler PC1 is turned on, the voltage of the capacitor C3 charged by the induced voltage of the tertiary winding N3 is applied between the control terminal P3 and the source terminal P2. The internal circuit of the intelligent power device IC1 controls the power MOSFET to reduce the output of the DC power supply circuit 45 when the voltage of the capacitor C3 increases. As a result, the common voltage Vd1 is controlled to decrease.

Next, when the value of the common voltage Vd1 falls below the reference voltage, the anode and cathode of the shunt regulator SR1 are cut off, no current flows through the input diode of the photocoupler PC1, and the output transistor of the photocoupler PC1 is turned off. When the output transistor of the photocoupler PC1 is turned off, the voltage of the capacitor C3 decreases, and the internal circuit of the intelligent power device IC1 controls the power MOSFET to increase the output of the DC power supply circuit 45. As a result, the common voltage Vd1 is controlled to increase.

In this way, the DC power supply circuit 45 controls the value of the common voltage Vd1 to a predetermined value by feeding back the common voltage Vd1 via the photocoupler PC1 and controlling the switching of the intelligent power device IC1. It is preferable that the DC power supply circuit 45 further has a voltage step-down function and a power factor correction function.

Note that the DC power supply circuit 45 is not limited to a configuration using a flyback converter, and may have any configuration as long as it can convert the AC voltage of the external power supply 9 to the common voltage Vd1.

(4) First Specific Example of Lighting Circuit FIG. 8 shows a circuit configuration of a first specific example of the lighting circuit 41. The lighting circuit 41 includes a switching circuit 41a, an emergency lighting circuit 41b, and a current adjustment circuit 41c. In addition, in FIG. 8, the charging circuit 40 receives the common voltage Vd1 as input, and charges the battery 3 through the diode D10 for preventing backflow.

The switching circuit 41a has a function of switching the power source for lighting the light source 2 to either the DC power supply circuit 45 or the battery 3. Specifically, the switching circuit 41a includes transistors Q11 to Q13, resistors R11 to R13, and capacitors C11 and C12. Transistors Q11 and Q12 are PNP type bipolar transistors. Transistor Q13 is an NPN type bipolar transistor.

The emitter of transistor Q11 is connected to the positive terminal of output capacitor C6 (see FIG. 7), and the collector of transistor Q11 is connected to the collector of transistor Q12. The base of transistor Q11 is connected to the collector of transistor Q13 via resistor R11, and the emitter of transistor Q13 is connected to the negative electrode of output capacitor C6 (see FIG. 7). A capacitor C11 is connected between the base and emitter of transistor Q11. A capacitor C12 is connected between the base and emitter of transistor Q12. The base of transistor Q12 is connected to control circuit 42 via resistor R12. The base of transistor Q13 is connected to control circuit 42 via resistor R13.

The emergency lighting circuit 41b boosts the battery voltage Vb and outputs a DC emergency voltage Vd2. The value of the emergency voltage Vd2 is the same (or almost the same) as the normal voltage Vd1. Specifically, the emergency lighting circuit 41b includes transistors Q21, Q22, resistors R21 to R25, an output capacitor C21, an inductor L21, a diode D21, and a switching controller 411 (hereinafter abbreviated as SW controller 411). Transistor Q21 is an N-channel enhancement type MOSFET. Transistor Q22 is an NPN type bipolar transistor.

A series circuit of an inductor L21 and a transistor Q21 is connected between both ends of the battery 3. A series circuit of a diode D21 and an output capacitor C21 is connected between the drain and source of the transistor Q21. A series circuit of a resistor R21 and a resistor R22 is connected between both ends of the output capacitor C21. The gate of transistor Q21 is connected to SW controller 411 via resistor R23. Further, a series circuit of a resistor R24 and a transistor Q22 is connected between both ends of the battery 3. The base of transistor Q22 is connected to control circuit 42 via resistor R25.

In this embodiment, as an example of the SW controller 411, S-8355 manufactured by ABLIC Inc. is used. The SW controller 411 uses the battery voltage Vb as an operating power source. The SW controller 411 is connected to the collector of the transistor Q22, and if the collector voltage Vc1 of the transistor Q22 is at L level, the SW controller 411 maintains the transistor Q21 in an off state and stops the boosting operation of the battery voltage Vb. When the collector voltage Vc1 of the transistor Q22 is at H level, the SW controller 411 turns on and off the transistor Q21 to boost the battery voltage Vb. The SW controller 411 that performs the step-up operation acquires the voltage at the connection point between the resistor R21 and the resistor R22 as the detected value of the emergency voltage Vd2, and turns on and off the transistor Q21 so that the value of the emergency voltage Vd2 becomes a predetermined value. .

The control circuit 42 outputs a control signal Y1 and a control signal Y2, and controls each operation of the switching circuit 41a and the emergency lighting circuit 41b using the control signal Y1 and the control signal Y2. The control signal Y1 and the control signal Y2 are binary voltage signals whose voltage values can be switched to either H level or L level. Control signal Y1 is transmitted to the base of transistor Q12 via resistor R12, and then transmitted to the base of transistor Q22 via resistor R25. Control signal Y2 is transmitted to the base of transistor Q13 via resistor R13.

FIG. 9 is a time chart showing the waveforms of the control signals Y1, Y2 and the collector voltage Vc1, and the states of the transistors Q11, Q12, Q13, and Q22.

The control circuit 42 controls the control signal Y1 and the control signal Y2 to the H level during the normal period Ta1 in which the power outage detection circuit 46 does not detect a power outage.

When the control signal Y1 is at H level, the transistor Q12 is turned off and the transistor Q22 is turned on. Since the collector voltage Vc1 of the transistor Q22 is at the L level, the SW controller 411 maintains the transistor Q21 in an off state and stops the boosting operation of the battery voltage Vb. Further, the current path from the positive electrode of the output capacitor C21 to the light source 2 is cut off by the transistor Q12 which is in an off state.

When the control signal Y2 is at H level, the transistor Q13 is turned on, and as a result, the transistor Q11 is turned on. Therefore, the common voltage Vd1 is outputted via the transistor Q11. That is, the switching circuit 41a outputs the normal voltage Vd1 if the power outage detection circuit 46 does not detect a power outage.

Furthermore, during the power outage period Tb1 during which the power outage detection circuit 46 detects a power outage, the control circuit 42 controls the control signal Y1 and the control signal Y2 to the L level, respectively.

When control signal Y2 is at L level, transistor Q13 is turned off, and as a result, transistor Q11 is turned off. Therefore, the current path to the light source 2 due to the common voltage Vd1 is blocked by the off-state transistor Q11.

When the control signal Y1 is at L level, the transistor Q12 is turned on and the transistor Q22 is turned off. Since the collector voltage Vc1 of the transistor Q22 is at H level, the SW controller 411 turns on and off the transistor Q21 to boost the battery voltage Vb. Further, the current path between the positive electrode of the output capacitor C21 and the light source 2 is made conductive by the transistor Q12 in the on state. Therefore, emergency voltage Vd2 is output via transistor Q12. That is, the switching circuit 41a outputs the emergency voltage Vd2 if the power outage detection circuit 46 detects a power outage.

The normal voltage Vd1 or the emergency voltage Vd2 output by the switching circuit 41a is applied to a series circuit of the current adjustment circuit 41c and the light source 2. Note that in order to prevent transistors Q11 and Q12 from being on at the same time, it is preferable to provide a simultaneous off period of about several milliseconds during which both transistors Q11 and Q12 are off when the states of transistors Q11 and Q12 are switched.

The current adjustment circuit 41c matches the value of the load current flowing through the light source 2 with the target current value. Specifically, the current adjustment circuit 41c includes transistors Q31, Q32, resistors R31 to R33, and a shunt regulator SR31. Transistors Q31 and Q32 are NPN type bipolar transistors.

A series circuit of the light source 2, the transistor Q31, and the resistor R31 is connected between the output terminals of the switching circuit 41a. The light source 2 uses LEDs (Light Emitting Diodes) as solid-state light emitting elements, and includes a plurality of LEDs connected in series. In a pair of adjacent LEDs, the cathode of one LED is connected to the anode of the other LED. The light source 2 has a high potential side as an anode side and a low potential side as a cathode side. In this case, the anode side of the light source 2 is connected to each collector of the transistors Q11 and Q12. The cathode side of the light source 2 is connected to the collector of the transistor Q31. The emitter of transistor Q31 is connected to the emitter of transistor Q13 via resistor R31.

A series circuit of a resistor R32 and a shunt regulator SR31 is further connected between the output terminals of the switching circuit 41a. A first end of the resistor R32 is connected to the anode side of the light source 2, and a second end of the resistor R32 is connected to the cathode of the shunt regulator SR31. The anode of shunt regulator SR31 is connected to the emitter of transistor Q31 via resistor R31. The emitter of transistor Q31 is connected to the control terminal of shunt regulator SR31. The base of transistor Q31 is connected to the emitter of transistor Q32, and the collector of transistor Q32 is connected to the anode side of light source 2 via resistor R33.

When the voltage across the resistor R31 caused by the load current exceeds a reference voltage (corresponding to a target current value) inside the shunt regulator SR31, conduction occurs between the anode and cathode of the shunt regulator SR31. When conduction occurs between the anode and cathode of shunt regulator SR31, transistor Q32 is turned off, and transistor Q31 is turned off. Then, when the voltage across the resistor R31 becomes lower than the reference voltage inside the shunt regulator SR31, the anode and cathode of the shunt regulator SR31 are cut off. When the anode and cathode of the shunt regulator SR31 are cut off, the transistor Q32 is turned on and the transistor Q31 is turned on. As a result, the value of the load current matches the target current value.

Therefore, if the power failure detection circuit 46 does not detect a power failure, a load current using the common voltage Vd1 as a power source flows through the light source 2, and the light source 2 lights up. If the power outage detection circuit 46 detects a power outage, a load current using the emergency voltage Vd2 as a power source flows through the light source 2, and the light source 2 lights up. The current adjustment circuit 41c matches the value of the load current flowing through the light source 2 with the target current value.

When performing any of the first to third abnormality detection processes described above, the abnormality detection circuit 422 instructs the charging circuit 40 to stop trickle charging. Then, when any one of the first to third abnormality detection processes is completed, the abnormality detection circuit 422 instructs the charging circuit 40 to start charging (trickle charging if necessary).

Furthermore, when performing any of the fourth to sixth abnormality detection processes described above, the abnormality detection circuit 422 instructs the charging circuit 40 to start trickle charging.

(5) Second specific example of lighting circuit FIG. 10 shows a circuit configuration of a second specific example of the lighting circuit 41. The lighting device 4 further includes a control power source 44. The control power supply 44 receives the battery voltage Vb and outputs the control voltage Vs1. The control voltage Vs1 serves as an operating power source for the control circuit 42. Note that, in FIG. 10, the charging circuit 40 receives the normal voltage Vd1 and charges the battery 3 via the backflow prevention diode D10.

The lighting circuit 41 boosts the battery voltage Vb and outputs a DC emergency voltage Vd3. Specifically, the lighting circuit 41 includes transistors Q41 to Q44, resistors R41 to R411, capacitors C41 to C46, an inductor L41, a diode D41, and a switching controller 412 (hereinafter abbreviated as SW controller 412). Transistors Q41 and Q43 are N-channel enhancement type MOSFETs. Transistors Q42 and Q44 are NPN type bipolar transistors.

Battery voltage Vb is applied across the capacitor C41. A series circuit of an inductor L41 and a transistor Q41 is connected between both ends of the capacitor C41. A series circuit of a diode D41 and a capacitor C42 is connected between the drain and source of the transistor Q41. The anode of diode D41 is connected to the drain of transistor Q41, and the cathode of diode D41 is connected to the positive electrode of capacitor C42. The negative electrode of capacitor C42 is connected to the negative electrode of capacitor C41. A series circuit of the light source 2, the transistor Q43, and the resistor R48 is connected between both ends of the capacitor C42. The anode side of the light source 2 is connected to the positive electrode of the capacitor C42. The cathode side of light source 2 is connected to the drain of transistor Q43. The source of transistor Q43 is connected to the negative electrode of capacitor C42 via resistor R48. The gate of transistor Q43 is connected to the positive output of control power supply 44 via resistor R49, and to the source of transistor Q43 via resistor R410. A resistor R410 is connected between the collector and emitter of transistor Q44. The base of transistor Q44 is connected to control circuit 42 via resistor R411. The gate of transistor Q41 is connected to SW controller 412 via resistor R41. A resistor R42 is connected between the gate and source of the transistor Q41.

Control voltage Vs1 is applied to the series circuit of resistor R43 and capacitor C43. The connection point between resistor R43 and capacitor C43 is connected to the collector of transistor Q42, and the emitter of transistor Q42 is connected to the negative electrode of capacitor C41. The base of transistor Q42 is connected to control circuit 42 via resistor R44.

In this embodiment, as an example of the SW controller 412, S-8338 manufactured by ABLIC Inc. is used. The SW controller 412 is connected to both ends of a capacitor C46 to which a control voltage Vs1 is applied, and uses the control voltage Vs1 as an operating power source. SW controller 412 is connected to the collector of transistor Q42 and monitors collector voltage Vc2 of transistor Q42. If the collector voltage Vc2 is at the L level, the SW controller 412 maintains the transistor Q41 in the off state and stops the boosting operation of the battery voltage Vb. If collector voltage Vc2 is at H level, SW controller 412 turns transistor Q42 on and off to boost battery voltage Vb. The SW controller 412 that performs the boost operation acquires the voltage across the resistor R48 as the detected value of the load current via the resistor R47, and turns on and off the transistor Q41 so that the value of the load current matches the target current value.

A series circuit of a resistor R45 and a capacitor C45, a capacitor C44, and a resistor R46 are further connected to the SW controller 412. The series circuit of resistor R45 and capacitor C45 is an element for output phase compensation of the error amplification circuit inside SW controller 412. The capacitor C44 is an element for setting a delay time for short circuit protection. The resistor R46 is an element for setting the oscillation frequency.

Then, the control circuit 42 outputs a control signal Y3, and controls the operation of the lighting circuit 41 using the control signal Y3. The control signal Y3 is a binary voltage signal whose voltage value can be switched to either H level or L level. Control signal Y3 is transmitted to the base of transistor Q42 via resistor R44, and then transmitted to the base of transistor Q44 via resistor R411.

FIG. 11 is a time chart showing the waveforms of the control signal Y3 and the collector voltage Vc2, and the states of the transistors Q42, Q43, and Q44.

The control circuit 42 controls the control signal Y3 to the H level during the normal period Ta2 in which the power outage detection circuit 46 does not detect a power outage. When the control signal Y3 is at the H level, the transistor Q42 is turned on and the collector voltage Vc2 of the transistor Q42 becomes the L level. Further, transistor Q44 is turned on and transistor Q43 is turned off. Since the collector voltage Vc2 is at the L level, the SW controller 412 maintains the transistor Q41 in the off state and stops the boosting operation of the battery voltage Vb. Further, the current path from the light source 2 to the negative electrode of the capacitor C42 is cut off by the transistor Q43 which is in an off state. Therefore, during the normal period Ta2, the light source 2 is turned off.

Further, the control circuit 42 controls the control signal Y3 to the L level during the power outage period Tb2 during which the power outage detection circuit 46 detects a power outage. When the control signal Y3 is at the L level, the transistor Q42 is turned off and the collector voltage Vc2 of the transistor Q42 becomes the H level. Furthermore, transistor Q44 is turned off and transistor Q43 is turned on. Therefore, the current path from the light source 2 to the negative electrode of the capacitor C42 is conducted by the transistor Q43 in the on state. Since the collector voltage Vc2 is at the H level, the SW controller 412 turns on and off the transistor Q41 to boost the battery voltage Vb and make the value of the load current match the target current value. As a result, during the power outage period Tb2, a load current flows through the light source 2, and the light source 2 lights up.

When performing any of the first to third abnormality detection processes described above, the abnormality detection circuit 422 instructs the charging circuit 40 to stop trickle charging. Then, when any one of the first to third abnormality detection processes is completed, the abnormality detection circuit 422 instructs the charging circuit 40 to start charging (trickle charging if necessary).

Furthermore, when performing any of the fourth to sixth abnormality detection processes described above, the abnormality detection circuit 422 instructs the charging circuit 40 to start trickle charging.

(6) Periodic Inspection The above-mentioned disaster prevention lighting equipment 1 is a disaster prevention lighting equipment such as a guide light or an emergency lighting equipment. Guide lights and emergency lighting equipment must undergo periodic inspections based on laws and regulations. The period for periodic inspection of guide lights is stipulated by the Fire Service Act, and the period for periodic inspection of emergency lighting equipment is stipulated by the Building Standards Act.

Furthermore, if the storage battery installed in the guide light has not exceeded the specified number of years since its manufacturing year, it is not necessary to inspect the storage battery during the above-mentioned periodic inspection of the guide light, taking into account the life of the battery. There is. In this case, if a predetermined number of years have passed since the year of manufacture of the storage battery installed in the guide light, it is necessary to carry out the above-mentioned periodic inspection of the guide light, taking into account the lifespan of the storage battery. For example, if the storage battery is a nickel-cadmium battery, periodic inspections must be performed if it has been more than three years since the battery was manufactured. Additionally, if the storage battery is a nickel-metal hydride battery, periodic inspections must be performed if it has been more than five years since the battery was manufactured.

However, the reality is that it is difficult to say that periodic inspections are performed at appropriate times (for example, at times specified by laws and regulations). Therefore, the disaster prevention lighting equipment 1 of this embodiment has the following notification function and automatic inspection function in order to perform periodic inspection at an appropriate time taking into consideration the life span of the storage battery.

First, as a premise, in the disaster prevention lighting equipment 1 according to the present embodiment, if the power usage period, which is the usage period of the battery 3, does not exceed the predetermined inspection time, there is no need to perform periodic inspections on the disaster prevention lighting equipment 1. becomes. Therefore, the control circuit 42 performs the following notification control process and inspection control process after the power usage period reaches the predetermined inspection time.

The control circuit 42 is configured to have the functions of a power supply timer 424, an inspection timer 425, an appliance timer 426, a notification control circuit 427, and an inspection control circuit 428 (see FIG. 1).

When the control circuit 42 is equipped with an RTC (Real Time Clock), the power supply timer 424, inspection timer 425, and instrument timer 426 periodically read the RTC value and integrate the count value to keep track of the elapsed time. Performs a timekeeping operation to measure time. Alternatively, the power supply timer 424, the inspection timer 425, and the appliance timer 426 may be counters that measure time by incrementing a count value at a constant period (for example, a period of a clock frequency).

The notification control and automatic inspection control will be explained below.

The power supply timer 424 measures the power usage period, which is the usage period of the battery 3 . In the present embodiment, the power usage period is the elapsed time from the time when the external power supply 9 starts supplying power to the lighting device 4 . However, the starting point of the power usage period may be the time when the unused battery 3 attached to the disaster prevention lighting equipment 1 is fully charged by the charging circuit 40. Then, when the power supply timer 424 starts counting the power usage period, the time measured during the power usage period increases from zero as time passes. Moreover, the power supply timer 424 is reset when the battery 3 is replaced with a new battery 3, and the timer time becomes zero. Power supply timer 424 is not reset when periodic inspection is performed. In this embodiment, the inspector or administrator simultaneously presses the push button switches 49A and 49B after replacing the battery 3. The control circuit 42 resets the power timer 424 when the pushbutton switches 49A and 49B are pressed simultaneously.

Alternatively, in a case where the control circuit 42 operates only with the discharged power of the battery 3, the control circuit 42 may detect whether the battery 3 is to be replaced based on whether or not the discharged power is supplied. For example, immediately before the voltage of the discharge power transmission path falls below the operating voltage of the control circuit 42 and the operation of the control circuit 42 stops, the control circuit 42 stores time information immediately before the stop based on the RTC value. I'll keep it. Then, immediately after the voltage of the discharge power transmission path exceeds the operating voltage of the control circuit 42 and the operation of the control circuit 42 is restarted, the control circuit 42 acquires time information immediately after restart based on the RTC value. do. The control circuit 42 calculates the stop time during which the operation was stopped from the difference between the time information immediately before the stop and the time information immediately after restarting, and if the stop time is longer than a certain time, it decides to replace the battery 3. is detected and the power supply timer 424 is reset.

The inspection timer 425 measures the period after the periodic inspection for discharging the battery 3 is completed as an uninspected period. The non-inspection period determines when to perform another periodic inspection on the same battery 3 (this is the second and subsequent periodic inspection on the same battery 3, hereinafter referred to as a re-periodic inspection) after the periodic inspection has been performed. used for When the inspection timer 425 starts counting time for the uninspected period, the measured time for the uninspected period increases from zero as time passes. Furthermore, the inspection timer 425 is reset when a periodic inspection is performed or when the battery 3 is replaced, and the time count becomes zero. In this embodiment, the inspector or manager simultaneously presses the push button switches 49A and 49C after a periodic inspection and after replacing the battery 3. The control circuit 42 resets the inspection timer 425 when the pushbutton switches 49A and 49C are pressed simultaneously. Alternatively, when the control circuit 42 executes a periodic inspection, the control circuit 42 may reset the inspection timer 425. Alternatively, the control circuit 42 may reset the inspection timer 425 similarly to the power timer 424 when the battery 3 is replaced.

The appliance timer 426 measures the appliance usage period, which is the usage period of the disaster prevention lighting equipment 1. In this embodiment, the appliance usage period is the elapsed time from the time when the external power supply 9 starts supplying power to the lighting device 4. However, the starting point of the appliance usage period may be the time when the new battery 3 is fully charged by the charging circuit 40. Then, when the appliance timer 426 starts counting the appliance usage period, the measured time of the appliance usage period increases from zero as time passes. Instrument timer 426 is not reset when a periodic inspection is performed.

Then, the notification control circuit 427 controls the notification circuit 43 based on the time measured by the power supply timer 424, inspection timer 425, and appliance timer 426 (power usage period, uninspected period, and appliance usage period). In other words, the notification circuit 43 performs notification according to each time measured by the power supply timer 424, inspection timer 425, and appliance timer 426.

Specifically, the notification control circuit 427 uses the time measured by the power supply timer 424 to perform inspection notification control that causes the notification circuit 43 to issue an inspection notification. In this specification, the inspection notification refers to a notification urging a person to perform the first periodic inspection. The notification control circuit 427 stores data on the inspection notification time in advance, and performs a comparison process between the time measured by the power supply timer 424 and the inspection notification time. When the time measured by the power supply timer 424 reaches the inspection notification time, the notification control circuit 427 controls the notification circuit 43 to issue an inspection notification. The inspection notification time is a periodic inspection period specified by law, and corresponds to, for example, 3 years or 5 years.

Furthermore, the notification control circuit 427 uses the time measured by the inspection timer 425 to perform re-inspection notification control that causes the notification circuit 43 to issue a re-inspection notification. In this specification, the re-inspection notification refers to a notification that urges a person to perform the second and subsequent periodic inspections on the battery 3 (re-periodic inspections). The notification control circuit 427 stores data of the re-inspection notification time in advance, and performs a comparison process between the time measured by the inspection timer 425 and the re-inspection notification time. When the time measured by the inspection timer 425 reaches the re-inspection notification time, the notification control circuit 427 controls the notification circuit 43 to issue a re-inspection notification. At this time, it is preferable that the re-inspection notification time is shorter than the inspection notification time.

Furthermore, the notification control circuit 427 uses the time measured by the appliance timer 426 to perform appliance replacement notification control that causes the notification circuit 43 to issue a appliance replacement notification. In this specification, the appliance replacement notification refers to a notification that urges a person to replace the disaster prevention lighting equipment 1. The notification control circuit 427 stores data on the appliance replacement notification time in advance, and performs a comparison process between the time measured by the appliance timer 426 and the appliance replacement notification time. When the time measured by the appliance timer 426 reaches the appliance replacement notification time, the notification control circuit 427 controls the notification circuit 43 to notify the appliance replacement. The appliance replacement notification time is a period that is predetermined based on the lifespan of the disaster prevention lighting equipment 1, and corresponds to, for example, 10 years.

Furthermore, the notification control circuit 427 uses the time measured by the appliance timer 426 to perform appliance replacement re-notification control that causes the notification circuit 43 to issue a replacement re-notification. In this specification, the equipment replacement re-notification refers to a notification that urges a person to replace the disaster prevention lighting equipment 1 more strongly than a re-inspection notification. The notification control circuit 427 stores data on the appliance life time in advance, and performs a comparison process between the time measured by the appliance timer 426 and the appliance life time. Then, when the time measured by the appliance timer 426 reaches the appliance life time, the notification control circuit 427 controls the notification circuit 43 to re-announce the appliance replacement. The appliance life time is a period that is predetermined based on the lifespan of the disaster prevention lighting equipment 1, and corresponds to, for example, 15 years.

In addition, the inspection control circuit 428 controls the charging circuit 40 and the lighting circuit 41 based on the time measured by the power supply timer 424, inspection timer 425, and appliance timer 426, thereby performing automatic inspection control that automatically performs periodic inspections. I do.

The inspection control circuit 428 executes a periodic inspection of the battery 3 when a first delay time has elapsed since the inspection notification was executed (for example, started). After the inspection notification is executed, an inspector may perform a periodic inspection. Note that the power supply timer 424 continues to measure the power supply usage period even if a periodic inspection of the battery 3 is performed before the time measured by the inspection timer 425 reaches the inspection notification time. In other words, until the time measured by the inspection timer 425 reaches the inspection notification period, the power supply timer 424 continues to measure the power usage period, regardless of whether or not the battery 3 is regularly inspected.

When the periodic inspection is completed, the inspection timer 425 starts counting the uninspected period. When the inspection timer 425 starts counting the uninspected period, the time measured by the inspection timer 425 increases from zero as time passes. The notification circuit 43 issues a re-inspection notification when the time measured by the inspection timer 425 reaches the re-inspection notification time. The inspection control circuit 428 executes a re-periodic inspection of the battery 3 when a second delay time has elapsed since the re-inspection notification was executed (for example, started). After the re-inspection notification is executed, the inspector may perform another periodic inspection of the battery 3.

The inspection control circuit 428 stops the charging circuit 40 for a predetermined period of time if the battery 3 is fully charged when performing periodic inspection (including re-periodic inspection), and turns on the lighting circuit. 41 to cause the light source 2 to be lit steadily (for example, fully lit). If the battery 3 is not fully charged, the inspection control circuit 428 first operates the charging circuit 40 to bring the battery 3 to a fully charged state, and then stops the charging circuit 40 for a predetermined period of time. , and operates the lighting circuit 41 to cause the light source 2 to be constantly lit (for example, fully lit). That is, the inspection control circuit 428 discharges the battery 3 when performing periodic inspection. In addition, if the battery 3 is not fully charged, the inspection control circuit 428 operates the charging circuit 40 to charge the battery 3 and operates the lighting circuit 41 for a predetermined period of time to charge the battery 3. 3 may be discharged.

Moreover, the inspection control circuit 428 may stop the charging circuit 40 and operate the lighting circuit 41 to cause the light source 2 to be constantly lit (for example, fully lit) regardless of the charging state of the battery 3. Furthermore, if the amount of charge in the charging circuit 40 is sufficiently smaller than the amount of discharge to the lighting circuit 41 (for example, trickle charging), the inspection control circuit 428 operates the lighting circuit 41 to turn on the light source 2 without stopping the charging circuit 40. The light may be constantly lit (for example, all the lights are lit).

Then, the inspection control circuit 428 performs the following operations based on the voltage value of the battery 3 and the current value flowing through the light source 2 at the time when a specified time (20 minutes, 30 minutes, or 60 minutes) has elapsed since the start of the periodic inspection. The disaster prevention lighting equipment 1 is periodically inspected, and the results of the periodic inspection are notified from the notification circuit 43. For example, if the inspection control circuit 428 determines that the battery 3 has deteriorated and is not normal (abnormal), the inspection control circuit 428 causes at least one of lighting or blinking of the display element 431 and audio output of the sounding section 432 to inform. In addition, if the inspection control circuit 428 determines that the light source 2 has deteriorated and is not normal (abnormal), the inspection control circuit 428 causes at least one of the lighting or blinking of the display element 431 and the audio output of the sounding section 432. inform. It is preferable that the notification form performed when an abnormality is reported for the battery 3 and the notification form performed when an abnormality is reported for the light source 2 are different from each other.

Further, the inspection control circuit 428 may determine that the battery 3 is normal if the lighting circuit 41 is operating normally when a specified time has elapsed since the start of the periodic inspection. The inspection control circuit 428 may determine that the battery 3 is not normal (abnormal) if the lighting circuit 41 is not operating normally due to a decrease in the output voltage of the battery 3 after the specified time has elapsed. .

Furthermore, the notification control circuit 427 uses the time measured by the power supply timer 424 to perform battery replacement notification control that causes the notification circuit 43 to issue a battery replacement notification. The battery replacement notification in this specification refers to a notification urging a person to replace the battery 3. The notification control circuit 427 stores data on the battery replacement notification time in advance, and performs a comparison process between the time measured by the power supply timer 424 and the battery replacement notification time. When the time measured by the power supply timer 424 reaches the battery replacement notification time, the notification control circuit 427 controls the notification circuit 43 to issue a battery replacement notification. The battery replacement notification time is a predetermined period based on the lifespan of the battery 3, and corresponds to, for example, 90,000 hours.

Alternatively, the lighting device 4 may not perform the above-mentioned automatic inspection control, but may be configured such that only periodic inspections (including re-periodic inspections) by an inspector are performed as periodic inspections. In this case, even if the lighting device 4 issues an inspection notification or re-inspection notification, the inspector may not perform a regular inspection. Therefore, even if the third delay time has elapsed since the lighting device 4 issued the inspection notification or re-inspection notification, if the regular inspection has not been performed by the inspector, the notification control circuit 427 instructs the notification circuit 43 to replace the battery. Performs battery replacement notification control that causes notification to be performed.

(7) Structure of disaster prevention lighting fixture The structure of the disaster prevention lighting fixture 1 including the lighting device 4 will be described below with reference to FIGS. 12A to 12C. The disaster prevention lighting device 1 according to the present embodiment is attached to construction materials such as ceiling materials and wall materials, for example, and irradiates illumination light onto evacuation passages and the like in the event of a power outage.

The disaster prevention lighting fixture 1 includes a main body 10, a cover 11, and a pair of supports 12, as shown in FIGS. 12A to 12C.

As shown in FIGS. 12A and 12B, the main body 10 is formed into a cylindrical shape with one bottom (lower surface) open. A pair of supports 12 are attached to the side surfaces of the main body 10. An annular flange 100 is formed at the lower end of the main body 10 and projects outward.

The pair of supports 12 is formed into a long leaf spring shape, as shown in FIGS. 12A to 12C. Each support 12 is fixed to the side surface of the main body 10 at one end in the longitudinal direction, and is configured such that the other end in the longitudinal direction can be bent in a direction (upward) approaching the bottom surface (top surface) of the main body 10. . That is, the main body 10 is installed on the ceiling by sandwiching the ceiling material between a pair of supports 12 inserted into a hole provided in the ceiling and a flange 100 provided on the lower end surface of the main body 10. supported by wood.

As shown in FIGS. 12A to 12C, the cover 11 is formed into a disk shape that is larger in outer diameter than the flange 100 of the main body 10. As shown in FIGS. As shown in FIG. 12B, a circular window hole 110 is provided in the center of the cover 11. The lens 21 of the light source unit 2U passes through the window hole 110. A pair of attachment springs are attached to the cover 11. As shown in FIG. 12C, the cover 11 is held on the main body 10 by a pair of attachment springs while closing the bottom surface of the main body 10.

A lighting device 4 (see FIG. 1), a light source 2 (see FIG. 1), and a battery 3 (see FIG. 1) are attached to the main body 10. More specifically, as shown in FIG. 12B, the light source unit 2U, battery unit 3U, and lighting unit 4U are housed in the main body 10. However, the battery unit 3U is housed in the main body 10 so that it can be inserted and removed through the opening on the bottom surface of the main body 10.

The light source unit 2U includes an LED module 20 and a lens 21, as shown in FIG. 12B. The LED module 20 has a substrate on which the light source 2 is mounted, and when a voltage is applied in the forward direction, it emits white illumination light such as white, neutral white, or daylight color. The lens 21 is arranged in front of (below) the LED module 20 and collects light emitted from the LED module 20.

The battery unit 3U shown in FIG. 12B includes a battery 3 (see FIG. 1) including a plurality of unit cells and a battery case that houses the battery 3. The battery 3 is, for example, a nickel-hydrogen storage battery or a nickel-cadmium storage battery. The battery case is formed into a box shape made of an electrically insulating material such as synthetic resin, and accommodates a plurality of unit cells therein.

The lighting unit 4U shown in FIG. 12B includes the lighting device 4 (see FIG. 1). Light emitted from the monitor lamp 48 of the lighting device 4 is emitted to the front (downward) of the cover 11 through a first hole 111 provided in the cover 11. The receiving unit 47 receives (receives) a wireless signal through the second hole 112 provided in the cover 11 . Light emitted from the display element 431 of the notification circuit 43 is emitted to the front (downward) of the cover 11 through the third hole 114 provided in the cover 11. The push buttons of the three push button switches 49A, 49B, and 49C are arranged so as to face each of the three operation holes 113 provided in the cover 11.

(8) Disaster Prevention Lighting System FIG. 13 shows the configuration of the disaster prevention lighting system B1 of this embodiment. The disaster prevention lighting system B1 includes a plurality of disaster prevention lighting fixtures 1.

In the disaster prevention lighting system B1, each of the plurality of disaster prevention lighting fixtures 1 has a communication function. The lighting device 4 further includes a communication circuit (not shown) connected to the communication line 8, and the communication circuit transmits and receives signals via the communication line 8. The communication circuit transmits and transmits signals in accordance with a wired LAN (Local Area Network) such as Ethernet (registered trademark) or a standard such as RS-485 (for example, IEEE 802.3 or RS-485). Preferably, the signal is received. Therefore, each lighting device 4 of the plurality of disaster prevention lighting devices 1 communicates via the communication line 8, and the control circuit 42 can exchange data with other lighting devices 4.

For example, each notification control circuit 427 of the plurality of lighting devices 4 receives data regarding the inspection timing of the other lighting device 4 (each data such as the next periodic inspection timing and delay time) from the control circuit 42 of the other lighting device 4. ) to obtain. Therefore, each notification control circuit 427 of the plurality of lighting devices 4 can set the periodic inspection timing of its own device so that the periodic inspection timing of its own device does not overlap with the periodic inspection timing of other lighting devices 4.

Further, each notification control circuit 427 of the plurality of lighting devices 4 may transmit data regarding the periodic inspection timing of its own device by multicast or broadcast. In this case, each of the plurality of lighting devices 4 can easily acquire each data regarding the periodic inspection timing of the other lighting devices 4.

Further, each notification control circuit 427 of the plurality of lighting devices 4 may periodically transmit a data request to other lighting devices 4 by multicast or broadcast. The notification control circuit 427 that has received the data request returns data regarding the periodic inspection timing of its own device to the lighting device 4 from which the data request was sent.

Further, the communication circuit of the lighting device 4 may transmit and receive signals by wireless communication. For example, the communication circuit may transmit signals in accordance with standards such as wireless LAN, BLUETOOTH (registered trademark), or ZIGBEE (registered trademark) (e.g., IEEE 802.11, IEEE 802.15.1, or IEEE 802.15.4). and receive signals. In this case, the communication line 8 becomes unnecessary in the disaster prevention lighting system.

Therefore, each of the plurality of lighting devices 4 included in the disaster prevention lighting system B1 can grasp the periodic inspection timing of the other lighting devices 4, and can prevent the periodic inspection timing of its own device from overlapping with the periodic inspection timing of the other lighting devices 4. can be set flexibly.

(9) Summary The lighting device (4) of the first aspect according to the above-described embodiment includes a lighting circuit (41), a charging circuit (40), a voltage detection circuit (421), and an abnormality detection circuit (422). and. The lighting circuit (41) executes emergency lighting to light the light source (2) using emergency power supplied from the battery (3) when the external power source (9) is stopped. The charging circuit (40) charges the battery (3). The voltage detection circuit (421) detects the battery voltage (Vb) of the battery (3). The abnormality detection circuit (422) performs abnormality detection processing to detect abnormality of the battery (3) based on the battery voltage (Vb) detected by the voltage detection circuit (421). The abnormality detection circuit (422) performs charge amount variation processing to vary the charging current to the battery (3), and performs abnormality detection processing based on the state of variation in battery voltage (Vb) due to the charge amount variation processing.

The lighting device (4) described above can inspect the battery (3) without using a discharge circuit.

Further, in the lighting device (4) of the second aspect according to the embodiment, in the first aspect, the fluctuation state is the detected value of the battery voltage (Vb) after the charge amount fluctuation process is started (|Vb| ) is preferable.

The lighting device (4) described above can inspect the battery (3) based on the detected value (|Vb|).

Further, in the lighting device (4) of the third aspect according to the embodiment, in the first aspect, the fluctuation state is the amount of fluctuation in the detected value (|Vb|) of the battery voltage (Vb) by the charge amount fluctuation processing. It is preferable that there be.

The lighting device (4) described above can inspect the battery (3) based on the amount of variation in the detected value (|Vb|).

Furthermore, in the lighting device (4) of the fourth aspect according to the embodiment, in the first aspect, the fluctuation state is the detected value (|Vb| ) is preferably the rate of variation.

The lighting device (4) described above can inspect the battery (3) based on the rate of variation of the detected value (|Vb|).

Further, in the lighting device (4) of the fifth aspect according to the embodiment, in any one of the first to fourth aspects, the abnormality detection circuit (422) is configured to detect It is preferable to stop the charge amount variation process when the elapsed time reaches the first threshold (tc2) or when the detected value (|Vb|) of the battery voltage (Vb) reaches the second threshold (K2).

The lighting device (4) described above can suppress execution of unnecessary charge amount variation processing.

In addition, in any one of the first to fifth aspects, the lighting device (4) of the sixth aspect according to the embodiment includes an abnormality timer ( ) 423 is preferably further provided. The abnormality detection circuit (422) performs abnormality detection processing after the clock value of the undetermined period reaches a predetermined determination value.

The lighting device (4) described above can automatically perform abnormality detection processing.

Further, in any one of the first to sixth aspects, the lighting device (4) of the seventh aspect according to the embodiment detects that the abnormality detection circuit (422) has detected an abnormality of the battery (3). It is preferable to further include a notification circuit (43) for notification.

The lighting device (4) described above can notify a person that the battery (3) is abnormal and prompt the person to replace the battery (3).

Further, in the lighting device (4) of the eighth aspect according to the embodiment, in any one of the first to seventh aspects, the charge amount fluctuation process is a charge amount reduction process that reduces the charging current. is preferred. After the charge amount reduction process is completed, the charging circuit (40) charges the battery (3) over a predetermined charging period. The charging period is a period until the detected value (|Vb|) of the battery voltage (Vb) during charging reaches the detected value (|Vb|) of the battery voltage (Vb) before the start of the charge amount reduction process, Or it is a period of the same time length as the charge amount reduction process.

The lighting device (4) described above can restore the remaining capacity of the battery (3) to the value immediately before the charge amount reduction process.

Further, in the lighting device (4) of the ninth aspect according to the embodiment, in any one of the first to eighth aspects, the lighting device (4) further includes a power supply timer (424) and an inspection control circuit (428). It is preferable. The power supply timer (424) measures the power usage period, which is the usage period of the battery (3). The inspection control circuit (428) executes an inspection in which the battery (3) is discharged for a predetermined period of time after the measured value of the power usage period reaches a predetermined inspection time.

The above-mentioned lighting device (4) can perform periodic inspections and the like more reliably.

Further, in the lighting device (4) of the tenth aspect according to the embodiment, in any one of the first to eighth aspects, the lighting device (4) may further include a power supply timer (424) and a notification circuit (43). is preferred. The power supply timer (424) measures the power usage period, which is the usage period of the battery (3). The notification circuit (43) performs notification after the time measured during the power usage period reaches a predetermined notification time.

The above-mentioned lighting device (4) can notify the timing of periodic inspection and the like.

Moreover, the lighting device (4) of the eleventh aspect according to the embodiment is included in the disaster prevention lighting fixture (1) in any one of the first to eighth aspects. Preferably, the lighting device (4) further includes a power supply timer (424), a fixture timer (426), and a notification circuit (43). The power supply timer (424) measures the power usage period, which is the usage period of the battery (3), and resets the clock time of the power usage period when the battery (3) is replaced. The appliance timer (426) measures the appliance usage period, which is the usage period of the disaster prevention lighting equipment (1). The notification circuit (43) issues an inspection notification after the time measured during the power usage period reaches the inspection notification time, and issues a replacement notification after the measured time during the appliance usage period reaches the appliance replacement notification time.

The above-mentioned lighting device (4) can notify the time to replace the disaster prevention lighting equipment (1) by a replacement notification.

Moreover, the disaster prevention lighting fixture (1) of the twelfth aspect according to the embodiment includes the lighting device (4) of any one of the first to eleventh aspects, a light source (2), a battery (3), A main body (10). The light source (2) is lit by the output of the lighting device (4). The battery (3) supplies the lighting device (4) with emergency power for lighting the light source (2). A lighting device (4), a light source (2), and a battery (3) are attached to the main body (10).

The above-described disaster prevention lighting device (1) allows inspection of the battery (3) without using a discharge circuit.

Moreover, the disaster prevention lighting system (B1) of the thirteenth aspect according to the embodiment includes a plurality of disaster prevention lighting fixtures (1) of the twelfth aspect.

The above-described disaster prevention lighting system (B1) can inspect the battery (3) without using a discharge circuit.

1 Disaster prevention lighting equipment 2 Light source 3 Battery 4 Lighting device 40 Charging circuit 41 Lighting circuit 421 Voltage detection circuit 422 Abnormality detection circuit 423 Abnormality timer 424 Power supply timer 426 Apparatus timer 428 Inspection control circuit 43 Notification circuit 44 Control power supply 9 External power supply 10 Main body Vb Battery voltage |Vb| Detected value of battery voltage B1 Disaster prevention lighting system

Claims (12)

a lighting circuit that executes emergency lighting that lights up the light source with emergency power supplied from a battery when the external power supply stops;
a charging circuit that charges the battery;
a voltage detection circuit that detects the battery voltage of the battery;
an abnormality detection circuit that performs abnormality detection processing to detect an abnormality in the battery based on the battery voltage detected by the voltage detection circuit,
The equivalent circuit of the battery includes an ideal voltage source with no internal resistance, a first internal resistance corresponding to a solution resistance, a second internal resistance corresponding to a charge transfer resistance, and a capacitor corresponding to an electric double layer. , the second internal resistance and the capacitor are connected in parallel to form an RC parallel circuit, the voltage source, the first internal resistance and the RC parallel circuit are connected in series,
The abnormality detection circuit performs a charge amount variation process to vary a charging current to the battery, and performs the abnormality detection process based on a fluctuation state of the battery voltage due to the charge amount variation process,
The abnormality detection circuit is
When performing a charge amount reduction process in which the charging current is reduced as the charge amount variation process, a first period in which the battery voltage falls because the voltage drop of the first internal resistance is reduced by the charge amount reduction process. Performing the abnormality detection process based on the fluctuating state at the end timing,
When performing a charge amount increasing process in which the charging current is increased as the charge amount variation process, the battery voltage rises because the charging current passes through the first internal resistor and the capacitor due to the charge amount increasing process. Performing the abnormality detection process based on the fluctuating state at the end timing of the three periods.
lighting device. The lighting device according to claim 1 , wherein the fluctuating state is a detected value of the battery voltage. The lighting device according to claim 1, wherein the fluctuation state is an amount of fluctuation in the detected value of the battery voltage by the charge amount fluctuation processing. The abnormality detection circuit stops the charge amount variation process when the elapsed time from the start of the charge amount variation process reaches a first threshold, or when the detected value of the battery voltage reaches a second threshold.
The lighting device according to any one of claims 1 to 3. further comprising an abnormality timer that measures a period in which the abnormality detection process is not performed as an undetermined period;
The abnormality detection circuit performs the abnormality detection process after the time value of the undetermined period reaches a predetermined determination value.
The lighting device according to any one of claims 1 to 4. The battery further includes a notification circuit that reports that the abnormality detection circuit has detected an abnormality in the battery.
The lighting device according to any one of claims 1 to 5. The charge amount variation process is the charge amount reduction process,
After the charge amount reduction process is completed, the charging circuit charges the battery for a predetermined charging period,
The charging period is a period from the start of charging the battery until the detected value of the battery voltage during charging reaches the detected value of the battery voltage before the start of the charge amount reduction process, or The period is the same length of time as the charge amount reduction process.
The lighting device according to any one of claims 1 to 6. a power supply timer that measures a power usage period that is a usage period of the battery;
further comprising an inspection control circuit that performs an inspection to discharge the battery for a predetermined period after the time value of the power usage period reaches a predetermined inspection time;
The lighting device according to any one of claims 1 to 7. a power supply timer that measures a power usage period that is a usage period of the battery;
A notification circuit that provides notification after the clocked time of the power usage period reaches a predetermined notification time.
road and further preparation
The lighting device according to any one of claims 1 to 7. The lighting device is included in a disaster prevention lighting device,
a power supply timer that measures a power usage period, which is a usage period of the battery, and resets the measured time of the power usage period when the battery is replaced;
an appliance timer that measures an appliance usage period that is a usage period of the disaster prevention lighting equipment;
It further comprises: a notification circuit that issues an inspection notification after the time measured during the power usage period reaches an inspection notification time, and provides an appliance replacement notification after the measured time during the appliance usage period reaches the appliance replacement notification time;
The lighting device according to any one of claims 1 to 7. The lighting device according to any one of claims 1 to 10,
a light source that is lit by the output of the lighting device;
a battery that supplies emergency power to the lighting device to light the light source;
A main body to which the lighting device, the light source, and the battery are attached.
Disaster prevention lighting equipment characterized by: A plurality of disaster prevention lighting devices according to claim 11 are provided.
A disaster prevention lighting system characterized by:

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