JPS5918837B2 - Emergency light lighting device with battery monitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emergency light lighting device with a battery monitor.

As shown in Fig. 1, the conventional emergency light lighting device with battery monitor constantly charges a secondary battery 5 using a commercial power supply AC through a power transformer 2, a bridge rectifier 3, and a charging resistor 4, and By energizing the relay 1, the relay contact 1a is switched to the NO side, and in the event of a commercial power outage, the relay contact 1a is switched to the NC side, and the lamp 6 is turned on by the secondary battery 5 in an emergency.

In addition, a battery monitor T connected to both ends of the secondary battery 5 includes a three-stone transistor 7A constituting a Schmitt circuit,
TB, 7C) Resistors 7D to 7, a capacitor 7L and a diode 7M, and the voltage of the secondary battery 5 or the detection voltage V
. The light emitting diode 8 is turned on when the power level drops further or when the secondary battery 5 is disconnected. In this case, the battery monitor 7 detects the input voltage or the detection voltage V, which is the lower threshold. When the voltage drops further, transistors TA and TB
, TC transitions from on, on, off to off, off, on, causing the light emitting diode 8 to transition from the off state to the on state, and when the input voltage exceeds the upper threshold V, the transistor TA, ? B, 7C is shifted from off, off, on to on, on, off, causing the light emitting diode 8 to shift from the lit state to the off state. 11 is a capacitor.

The operation of the above circuit configuration will be explained in more detail.

When the commercial power supply AC is on, the battery voltage of the secondary battery 5 is high due to charging, or when a power outage occurs, the relay contact 1a switches to the NC side and the secondary battery 5 discharges to the lamp 6 via the relay contact 1a. Start. At the beginning of discharge, the battery voltage of the secondary battery 5 is high, so the transistors 7A and TB are turned on, the transistor 7C is turned off, and the light emitting diode 8 is turned off. When the voltage between the base and emitter of the transistor 7A becomes such that it cannot remain on, the transistor 7A turns off, and as a result, the transistor 7B turns off and the transistor 7C turns on. As a result, the light emitting diode 8 lights up, indicating an overdischarge state. When electricity is started in this state, the battery voltage of the secondary battery 5 increases due to charging. In this case, when transistor 7C is turned on, the emitter voltage of transistor 7A (the emitter voltage determined by the division ratio of resistor 7J and resistor 7G) is high, so in order to turn on transistor 7A, the base voltage (resistance 7E) must be higher than the emitter voltage (voltage of resistor 7G), but in this case, due to the dividing resistance ratio l of resistor 7D and resistor 7E, within the range of battery voltage increase of secondary battery 5, transistor 7
Since transistor A is set not to be turned on, transistor 7A and transistor 7B are turned off, and transistor 7C is turned off.
will continue to maintain the on state, and as a result, the overdischarge display state will continue. Next, stop this overdischarge display (
(reset), stop energizing and close relay contact 1a.
When switched to the NC side, the charging power supply circuit steps down the power supply voltage with the transformer 2 and rectifies it with the bridge rectifier 3, so that the charging voltage of the capacitor 11 to be charged is changed to the secondary battery 5.
This results in a superimposed voltage higher than the battery voltage.

This superimposed voltage is applied to both ends of the dividing resistors 7D and 7E, increases the base-emitter voltage of the transistor 7A, and forcibly turns on the transistor 7A.
When transistor 7A is turned on, transistor 7B is turned on, transistor 7C is turned off, and light emitting diode 8 is turned off (reset). Figure 2 is AB
This is a waveform diagram showing the operation when the battery is disconnected when the peak value of the voltage between AB is lower than the upper threshold value V, and when the voltage between AB and VAB as shown in FIG. 2A is applied to the battery monitor 7, Since the voltage value at the valley point of the AB voltage VAB is lower than the detection voltage VO, and the peak value is lower than the upper threshold, when the transistors 7A, 7B, and 7C turn off, turn off, and turn on, the state continues. A current 1LED having the same phase as the AB voltage AB as shown in FIG. 2B is applied to the light emitting diode 8.
is played to indicate that the battery is removed.

Figure 3 shows that the peak value of the voltage AB between AB is the upper threshold value V,
This is a waveform diagram showing the operation when the battery is disconnected when the temperature is higher.
Check whether the AB voltage VAB or the battery monitor 7 is as shown in Figure A.
When applied to the AB voltage VAB, the time T2, t
4. Detection voltage at t6.

When the voltage drops further, the transistors 7A, 7B, and 7C switch from on, on, and off to off, off, and on, and the light emitting diode 8 lights up. After that, the voltage between AB and VAB changes at times Tl, t3, t, and t7. When the upper threshold value V is exceeded, the transistors 7A, 7B, and 7C are switched from OFF, OFF, and ON to ON, ON, and OFF, and the light emitting diode 8 is turned off. At this time, the current flowing through the light emitting diode 8 LED
is as shown in Figure 3B. However, in such a configuration, the detected voltage will be low when the battery is disconnected.

When a secondary battery 5 with a voltage higher than that shown in Fig. 2 is connected, the state of the Schmitts circuit does not reverse and the light emitting diode 8 remains lit, making it unclear whether the secondary battery 5 is normal or not. Therefore, it is necessary to cut off the commercial power supply AC, reset the battery monitor 7, and check whether the light emitting diode 8 is lit (it lights even if it is normal). Also,
In the case of Fig. 3, the timing of connection is period t1 to T2, t3.
-T4, t5-T6, the light emitting diode 8 is turned off, or the period T. -Tl, t2~T3, t4~T5
, t6 to T7, the light is turned on even though it should be turned off. If the light goes out, you can tell that the secondary battery 5 is normal, but if it lights up, you need to reset the battery monitor 7 and check whether the light emitting diode 8 is lighting up or not (it lights up even if it is normal). . SUMMARY OF THE INVENTION An object of the present invention is to provide an emergency light lighting device with a battery monitor that can eliminate unnecessary resetting of the Schmitt circuit when recovering from a disconnected battery.

An embodiment of this invention is shown in FIG.

In other words, this emergency light lighting device with battery monitor has two
By connecting a flat capacitor 9 in parallel with the next battery 5, the valley point voltage of the voltage between AB when the battery is disconnected is detected as a voltage V.
Transistors 7A and 7B when the battery is disconnected by holding the
, 7C is not reversed, and the light emitting diode 8
A secondary battery 5 is connected in parallel with a transistor 7C connected in series with
Connect a Zener diode 10 with a Zener voltage VZD higher than the rated voltage VB of AB
When the voltage VAB exceeds the sum of the Zener voltage ZD and the light emitting diode voltage F, the Zener diode 10 is made conductive and current is passed through the light emitting diode 8 to light the LED to indicate that the battery is disconnected. Fig. 5 shows the operation when the sum of the Zener voltage VZD and the light emitting diode voltage F is between the peak value and the trough value of the AB voltage AB when the battery is disconnected. When the AB voltage VAB as shown in FIG. 5B occurs, a current LED as shown in FIG. 5B flows through the light emitting diode 8.

Figure 6 shows the operation when the sum of the zener voltage ZD and the light emitting diode voltage VF is lower than the valley point value of the AB voltage AB when the battery is disconnected. is the current 1LED flowing through the light emitting diode 8.

As a result of this configuration, when the secondary battery 5 is normally connected, the voltage of the secondary battery 5 is the detected voltage V.

When the voltage drops further, the Schmitt circuit consisting of transistors 7A, 7B, 7C, etc. is inverted and the light emitting diode 8 is activated.
lights up. After the voltage of the secondary battery 5 is restored, the light emitting diode 8 can be turned off by resetting the Schmitt circuit.

On the other hand, when the secondary battery 5 is disconnected, the peak of the voltage between AB and BB rises to exceed VZD+VF, which causes the re-energizer diode 10 to conduct and the light-emitting diode 8 to light up.

When the secondary battery 5 is connected, the peak of the AB voltage VAB decreases, the Zener diode 10 is cut off, and the light emitting diode 8 is turned off.

At this time, the valley point value of the voltage between AB is the voltage detected by the smoothing capacitor 9. Since the voltage is maintained at this level, the Schmitt circuit will not be reversed even if the battery is disconnected.

Therefore, there is no need to reset the Schmitt circuit when recovering from a disconnected battery, and the operation is not complicated. As described above, the emergency light lighting device with battery power monitor of the present invention includes an AC power source, a charging circuit connected to the AC power source, a secondary battery charged by the charging circuit, and detecting a power outage of the AC power source. a power outage detection circuit that detects a power outage; a lamp that receives power from the secondary battery in response to a power outage detected by the power outage detection circuit; and a lamp that receives power from the secondary battery in response to a power outage detected by the power outage detection circuit; a Schmitt circuit that inverts the output of the Schmitt circuit; an indicator that operates in response to the inverted output of the Schmitt circuit; a capacitor for flat wires that maintains the voltage above a threshold value; and a capacitor that is connected in series with the display device and conducts in response to a voltage increase at the secondary battery feeding end of the charging circuit due to battery disconnection, and operates the display device. Since it is equipped with a voltage element, it has the effect of eliminating the need to reset the Schmitt circuit when recovering from a battery disconnection.

[Brief explanation of the drawing]

Fig. 1 shows the circuit of a conventional emergency light lighting device with a battery monitor, Figs. 2 A, B and 3 A, B are waveform diagrams showing the operation when the battery is disconnected, and Fig. 4 shows an embodiment of the present invention. The circuit diagrams of the example, FIGS. 5A and 5B and FIGS. 6A and 6B, are waveform diagrams showing the operation when the battery is disconnected. AC: AC power supply, 1: Relay (power failure detection circuit), 2: Power transformer, 3:
... Bridge rectifier, 4... Charging resistor, 5.
...Secondary battery, 6...Lamp, 7.゜゜...Battery monitor, 7A, 7B, 7C...
Transistor (Schmitt circuit), 8...Light-emitting diode, 9...Capacitor for Hiyoshi, 10.
...Zener diode.

Claims (1)

[Claims] 1. An AC power source, a charging circuit connected to this AC power source,
A secondary battery that is charged by the charging circuit, a power outage detection circuit that detects a power outage of the AC power source, a lamp that is supplied with power from the secondary battery in response to the power outage detection of the power outage detection circuit, and the charging circuit. a Schmitt circuit that inverts when the voltage at the secondary battery feeding end of the rechargeable battery falls below its own lower threshold; an indicator that operates in response to the inverted output of the Schmitt circuit; and a display connected to the output side of the charging circuit. a smoothing capacitor that is connected in series with the indicator and that maintains the output voltage of the charging circuit at a time when the battery is disconnected to a level above the lower threshold of the Schmitts circuit; An emergency light lighting device with a battery monitor, comprising: a voltage response element that detects that a voltage at a power feeding end exceeds a predetermined value and turns on to operate the indicator.