JP7327038B2 - light alarm device - Google Patents

Description

The present invention relates to light warning devices.

2. Description of the Related Art In recent years, an optical warning system has been proposed that notifies the occurrence of a disaster such as a fire using sound and a highly visible flashlight or the like. According to the optical warning system, for example, a xenon lamp or the like emits high-intensity white light (flashlight) that emits pulses, so compared to display notifications using LEDs or red lamps, for example, even people with hearing disabilities can The occurrence can be recognized early and reliably.

As an optical alarm system, when a fire occurs, an optical alarm control device transmits a synchronizing signal to a plurality of optical alarm devices at predetermined intervals (for example, 1 second or 2 seconds). By performing synchronous light emission that repeats light emission with , it is possible to solve the problem of photosensitivity seizures that cause dazzle caused by light emission at different timings (for example, Patent Document 1).

JP 2016-103207 A

However, in the conventional optical alarm system, there is a risk that multiple optical alarm devices will not emit light synchronously due to the emergence of an optical alarm device that does not emit light at a predetermined period due to malfunction or device failure due to noise from the surrounding environment. There is Further, in the case of an optical alarm system in which only one optical alarm device is caused to emit light at a predetermined cycle from an optical alarm control device, there is a possibility that the emission cycle may deviate from the predetermined cycle. And in either case, there is a risk of triggering a photosensitivity attack.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and its object is to detect when a light alarm device does not emit light in a predetermined cycle so as not to cause a photosensitivity attack. is.

The present invention comprises a light emitting unit, a charging control unit for charging a capacitor for supplying a drive current to the light emitting unit, a light emission control signal generating unit for generating a light emission control signal having a predetermined cycle, and a light emission control signal based on the light emission control signal. a light emission control unit for causing the light emitting unit to emit light by discharging the capacitor to supply a driving current to the light emitting unit, and determining whether or not the light emission of the light emitting unit and the light emission control signal are synchronized. and a synchronization determination means, wherein when the synchronization determination means determines that synchronization is not performed, the light emission state of the light emitting portion is changed by changing the light emission control signal.

Advantageous Effects of Invention According to the present invention, it is possible to detect that the light alarm device has not emitted light in a predetermined cycle, thereby preventing a photosensitivity seizure.

1 is a block diagram showing the configuration of an optical warning device according to a first embodiment of the present invention; FIG. It is a flowchart which shows the 1st operation|movement of the optical warning device which concerns on the 1st Embodiment of this invention. 3 is a diagram showing waveforms of a light emission control signal and a charging voltage of a charging capacitor during the operation shown in FIG. 2; FIG. It is a flowchart which shows the 2nd operation|movement of the optical warning device which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the optical alarm device which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the 1st operation|movement of the optical warning device which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the 2nd operation|movement of the optical warning device which concerns on the 2nd Embodiment of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
<Configuration of optical alarm device>
FIG. 1 is a block diagram showing the configuration of an optical alarm device according to the first embodiment of the present invention.

As illustrated, the light alarm device 1 according to the first embodiment of the present invention includes a current control unit 11, a charging control unit 12, a charging capacitor 13, a light emission control unit 14, an LED 15 as a light emitting unit, a CPU 16, and A charging voltage monitoring unit 17 is provided.

The current control unit 11 outputs the power supply voltage and the synchronization pulse to the CPU 16 when the power supply voltage and the synchronization pulse (synchronization signal) of a predetermined period (1 second or 2 seconds) are input from the optical alarm control device (not shown). At the same time, a current of a predetermined value is generated and supplied to the charging control unit 12 . Here, the current value generated by the current control unit 11 corresponds to the emission intensity of the LED 15 set by a setting unit (not shown). The charge controller 12 charges the charging capacitor 13 with the current supplied from the current controller 11 . The light emission control unit 14 discharges the charging capacitor 13 and causes the LED 15 to emit light by supplying the discharge current to the LED 15 as a drive current. The charging voltage monitoring unit 17 monitors the charging voltage of the charging capacitor 13 and notifies the CPU 16 of the voltage value.

The CPU 16 generates a light emission control signal with a predetermined period based on the synchronizing pulse with a predetermined period output from the current control section 11 and outputs the light emission control signal to the light emission control section 14 so that the light emission control section 14 discharges the charging capacitor 13 . The light emission timing of the LED 15 is controlled by controlling the timing of light emission.

Further, the CPU 16 compares the voltage value notified from the charging voltage monitoring unit 17 and the light emission control signal to determine whether or not the light emission cycle is the predetermined cycle. , the light emission control signal is changed to change the light emission mode of the LED 15 so as not to cause a photosensitivity seizure. Details of this operation will be described later.

<First operation of light alarm device>
FIG. 2 is a flow chart showing the first operation of the light warning device according to the first embodiment of the present invention, and FIG. It is a figure which shows the waveform of a charge voltage. A first operation of the light alarm device 1 according to the first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG.

First, in the optical alarm device 1, a power supply voltage and a synchronous pulse sent by an optical alarm control device (not shown) in response to reception of a fire detection signal from a fire detector are input to the current control section 11 (step S1).

The current control unit 11 outputs the power supply voltage and the synchronization pulse to the CPU 16 , generates a current of a predetermined value, and supplies the current to the charging control unit 12 . The CPU 16 is activated by the supply of power supply voltage (step S2). The charge controller 12 charges the charging capacitor 13 with the current supplied from the current controller 11 .

Next, the CPU 16 generates a light emission control signal and outputs it to the light emission control section 14 (step S3). The light emission control unit 14 discharges the charging capacitor 13 and causes the LED 35 to emit light by supplying the discharge current to the LED 15 as a drive current.

The CPU 16 receives the voltage value of the charging voltage of the charging capacitor 13 from the charging voltage monitoring unit 17, and determines whether or not the change in the charging voltage is synchronized with the light emission control signal (step S4). This determination can be made, for example, based on whether the peak of the charging voltage is synchronized with the light emission control signal.

When it is determined that the light emission control signal and the change in the charging voltage are synchronized (step S4: Yes), it is determined that the operation is normal, and the process is repeated from step S3. FIG. 3A shows the emission control signal with a period of 1 second, and FIG. 3B shows the charge voltage with a period of 1 second, the change of which is synchronized with the change of the emission control signal.

On the other hand, if it is determined that the light emission control signal and the change in the charging voltage are not synchronized (step S4: No), then it is determined whether the change in the charging voltage is slower than the light emission control signal (step S5).

If it is determined that the change in the charging voltage is slow with respect to the light emission control signal (step S5: Yes), it is determined that there is a failure in the light emission control unit 14 or the like, the light emission control signal is stopped (step S6), and the LED 15 is put into the light emission stop state. Or, by keeping it in a lighting state, it prevents a photosensitivity seizure. FIG. 3C shows the emission control signal with a period of 1 second, and FIG. 3D shows the charge voltage whose change is slower than the change of the emission control signal.

If it is determined that the change in the charging voltage is faster than the light emission control signal (step S5: No), it is determined that the malfunction is due to noise from the environment, and the process proceeds to step S2, and the CPU 16 is restarted to restore the LED 15 to normal operation. to return to normal light-emitting behavior and prevent photosensitivity attacks. FIG. 3E shows the emission control signal with a period of 1 second, and FIG. 3F shows the charging voltage whose change is faster than the change of the emission control signal.

<Second operation of light alarm device>
FIG. 4 is a flow chart showing the second operation of the light warning device according to the first embodiment of the present invention.

Steps S11, S12, S13, S14 and S15 in this figure are the same as steps S1, S2, S3, S4 and S6 in FIG. 2, respectively. That is, in the second operation, when it is determined that the light emission control signal and the charge voltage change are not synchronized (step S14: No), light emission is performed without determining whether the charge voltage change is slow or not. By stopping the control signal (step S15) and quickly putting the LED 15 into the light emission stop state or lighting state, the photosensitivity seizure is quickly and reliably prevented.

[Second embodiment]
<Configuration of optical alarm device>
FIG. 5 is a block diagram showing the configuration of an optical warning device according to a second embodiment of the present invention. In this figure, the same reference numerals as in FIG. 1 are given to the same or corresponding components as in FIG.

The LED current monitoring unit 18 monitors the driving current flowing through the LED 15 and notifies the CPU 16 of the current value. The CPU 16 compares the current value notified from the LED current monitoring unit 18 with the light emission control signal to determine whether or not the light emission period is the predetermined period. By changing the control signal to change the light emission mode of the LED 15, the photosensitivity seizure is prevented. Details of this operation will be described later.

<First operation of light alarm device>
FIG. 6 is a flow chart showing the first operation of the light warning device according to the second embodiment of the present invention. A first operation of the light warning device 1 according to the second embodiment of the present invention will be described below with reference to FIGS. 5 and 6. FIG.

Steps S21, S22 and S23 in FIG. 5 are the same as steps S1, S2 and S3 in FIG. 2, respectively. In step S24, the CPU 16 receives the current value of the current flowing through the LED 15 from the LED current monitoring unit 18, and determines whether or not the light emission control signal and the change in the current flowing through the LED 15 are synchronized. This determination can be made, for example, based on whether the peak of the current flowing through the LED 15 is synchronized with the light emission control signal.

When it is determined that the light emission control signal and the change in the current flowing through the LED 15 are synchronized (step 24: Yes), it is determined that the operation is normal, and the process is repeated from step S23. Here, since the current flowing through the LED 15 is the discharge current of the charging capacitor 13, it rises at the falling timing of the charging voltage shown in FIG. 3B.

On the other hand, if it is determined that the change in the current flowing through the LED 15 is not synchronized with the light emission control signal (step S24: No), then it is determined whether the change in the current flowing through the LED 15 is slower than the light emission control signal. Determine (step S25).

If it is determined that the change in the current flowing through the LED 15 is slow with respect to the light emission control signal (step S25: Yes), it is determined that the light emission control unit 14 or the like has failed, the light emission control signal is stopped (step S26), and the LED 15 emits light. A photosensitivity seizure is prevented by setting it in a stopped state or a lighting state.

If it is determined that the change in the current flowing through the LED 15 is faster than the light emission control signal (step S25: No), it is determined that there is a malfunction due to noise from the environment, the process proceeds to step S22, and by restarting the CPU 16, the LED 15 to return to normal light-emitting behavior and prevent photosensitivity seizures.

<Second operation of light alarm device>
FIG. 7 is a flow chart showing the second operation of the light warning device according to the second embodiment of the present invention.

Steps S31, S32, S33, S34 and S35 in this figure are the same as steps S21, S22, S23, S24 and S26 in FIG. 6, respectively. That is, in the second operation, when it is determined that the change in the current flowing through the LED 15 is not synchronized with the light emission control signal (step S34: No), it is determined whether the change in the current flowing through the LED 15 is slow. The light emission control signal is stopped (step S35), and the light emission of the LED 15 is quickly turned off or turned on, so that a photosensitivity seizure is quickly and reliably prevented.

As described in detail above, according to the light alarm device 1 according to the embodiment of the present invention, the light emission control signal of the predetermined cycle and the current flowing through the LED 15 or the charging voltage of the charging capacitor 13 for generating the current When it is detected that the LED 15 does not emit light in a predetermined period based on the synchronization state, the light emission control signal is changed to change the light emission mode of the LED 15 so as not to cause a photosensitivity seizure. .

In the above-described embodiment, the CPU 16 generates the light emission control signal with a predetermined period based on the synchronizing pulse with a predetermined period sent from the optical alarm control device. The present invention can also be applied to an optical alarm device in which no synchronizing pulse is supplied to the alarm device and the CPU 16 can self-oscillate a light emission control signal of a predetermined cycle.

DESCRIPTION OF SYMBOLS 1... Light alarm device 11... Current control part 12... Charge control part 13... Charging capacitor 14... Light emission control part 15... LED 16... CPU 17... Charging voltage monitoring part 18... LED current monitoring Department.

Claims (5)

a light emitting unit;
a charging control unit that charges a capacitor for applying a drive current to the light emitting unit;
a light emission control signal generating means for generating a light emission control signal with a predetermined cycle;
a light emission control unit that discharges the capacitor based on the light emission control signal to supply a driving current to the light emitting unit and cause the light emitting unit to emit light;
Synchronization determination means for determining whether or not the light emission of the light emitting unit and the light emission control signal are synchronized,
An optical alarm device that changes the light emission state of the light emitting unit by changing the light emission control signal when the synchronization determination means determines that the synchronization is not performed. A light warning device as claimed in claim 1,
The synchronism determination means determines whether or not the light emission of the light emitting unit and the light emission control signal are synchronized from the change in the voltage of the capacitor and the period of the light emission control signal. A light warning device as claimed in claim 1,
The synchronism determining means determines whether or not the light emission of the light emitting section and the light emission control signal are synchronized based on the change in current flowing through the light emitting section and the cycle of the light emission control signal. A light warning device as claimed in claim 1,
The light alarm device, wherein the change of the light emission control signal is stop of the output of the light emission control signal. A light warning device as claimed in claim 1,
a delay determination means for determining whether or not the light emission of the light emitting unit is delayed with respect to the light emission control signal when the synchronization determination means determines that the synchronization is not performed;
The light emission control signal generation means stops the output of the light emission control signal when the delay determination means determines that it is late, and restarts the light warning device when it determines that it is early.

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