JP2020036419A - Emergency lighting fixture - Google Patents

Abstract

To provide an emergency lighting fixture capable of reducing manufacturing costs.SOLUTION: The emergency lighting fixture includes: a light source; a battery; a regular power supply circuit supplied with power from an external power supply so as to charge the battery; an emergency lighting circuit for boosting an output voltage of the battery so as to light the light source; and a control unit for controlling the emergency lighting circuit. The output voltage of the battery is lower than an operating voltage of the control unit. The control unit is operated by being supplied with power from the regular power supply circuit or the emergency lighting circuit, and, when a power failure of the external power supply is detected, the emergency lighting circuit is operated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an emergency lighting device.

  Patent Document 1 discloses a DC / DC converter that uses a dry battery as a DC power supply and supplies a higher voltage than the DC power supply to a control power supply of a control IC. In this DC / DC converter, a constant voltage circuit capable of supplying a voltage higher than the voltage of the DC power supply by using the output boosted by the transformer circuit is used as a control power supply for the control IC.

JP 2003-111390 A

  For example, in the event of a disaster or accident such as a fire or earthquake at a place where an unspecified number of people gather, emergency lights that illuminate the interior of the room may be used so that people at the place can safely evacuate. is there. As a light source of the emergency light, a fluorescent lamp or an LED is generally employed.

  Generally, a lighting device using an LED has higher conversion efficiency than a lighting device using a conventional fluorescent lamp. Therefore, the size of the lighting device may be reduced by reducing the size of the battery. At this time, the number of cells of the battery may be reduced.

  Consider a case where a voltage higher than the battery voltage is required as the power supply voltage of the emergency light control IC. In Patent Literature 1, power for a control IC is supplied from the side boosted by a constant voltage circuit. However, an emergency light generally has a minimum brightness. For this reason, the emergency lighting circuit is required to be a constant current type or a constant power type, and it may be difficult to realize the emergency lighting circuit with a constant voltage type. Therefore, when Patent Document 1 is applied to an emergency light, a constant voltage circuit for generating a power supply for the control IC is provided separately from a lighting circuit for lighting an LED. This may lead to an increase in the cost or size of the emergency light.

  The present invention has been made in order to solve the above-mentioned problem, and an object of the present invention is to provide an emergency lighting device capable of reducing manufacturing costs.

  An emergency lighting device according to the present invention includes a light source, a battery, a power supply circuit that is supplied with power from an external power supply and charges the battery, and an emergency light source that boosts an output voltage of the battery and turns on the light source. A lighting circuit, and a control unit for controlling the emergency lighting circuit, wherein the output voltage of the battery is lower than an operating voltage of the control unit, and the control unit is configured to control the emergency power supply circuit or the emergency lighting circuit. The emergency lighting circuit is operated by being supplied with power from the circuit and operating when the power failure of the external power supply is detected.

  In the emergency lighting device according to the present invention, the control unit operates by being supplied with electric power from the normal power supply circuit or the emergency lighting circuit. The control unit is supplied with power from the normal power supply circuit because the normal power supply circuit is operating during normal use. At the time of power failure, the control unit operates the emergency lighting circuit. Thus, the control unit is supplied with power from the emergency lighting circuit. Therefore, it is not necessary to provide a booster circuit for generating a power supply for the control unit. Therefore, manufacturing costs can be reduced.

FIG. 2 is a circuit block diagram of the emergency lighting device according to the first embodiment. FIG. 3 is a diagram illustrating voltage waveforms of a normal power supply circuit and an emergency lighting circuit according to the first embodiment. FIG. 3 is a diagram illustrating a voltage waveform of the input voltage detection circuit according to the first embodiment.

  An emergency lighting device according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components are denoted by the same reference numerals, and description thereof may not be repeated.

Embodiment 1 FIG.
FIG. 1 is a circuit block diagram of the emergency lighting device 100 according to the first embodiment. The emergency lighting device 100 includes the LED 30, the unit 10, and the battery 250. The LED 30 is a light source for ensuring brightness in an emergency. The unit 10 receives power from an external power supply AC and charges the battery 250. The external power supply AC is an AC power supply. The battery 250 supplies power to the LED 30 in an emergency.

  The unit 10 includes an input filter circuit 1, a regular power supply circuit 2, an emergency lighting circuit 3, a power supply generation circuit 4, and a control circuit 5.

  The input filter circuit 1 includes a fuse 11 for protecting overcurrent, a capacitor 12 for AC, and a diode bridge 13 for converting AC to DC. One end of the fuse 11 is connected to the high potential side of the external power supply AC. The other end of the fuse 11 is connected to the positive electrode of the capacitor 12 and the high potential side of the input of the diode bridge 13. The negative electrode of the capacitor 12 is connected to the low potential side of the external power supply AC and the low potential side of the input of the diode bridge 13. The output of the diode bridge 13 is connected to the ordinary power supply circuit 2.

  The service power supply circuit 2 is configured by an insulated flyback circuit. The power supply circuit 2 is supplied with power from an external power supply AC during normal use, and charges the battery 250. Further, the microcomputer 50 controls the ordinary power supply circuit 2. Here, the normal time indicates a normal state in which the external power supply AC is not in the power failure state or the pseudo power failure state.

  In the service power supply circuit 2, a capacitor 201 is connected in parallel with the output of the diode bridge 13. The low potential side of the output of the diode bridge 13 is connected to a ground terminal. The positive electrode of the capacitor 201 is connected to the positive electrode of the capacitor 202, one end of the resistor 203, and one end of the transformer 220 on the primary side. The cathode of a diode 204 is connected to the negative electrode of the capacitor 202 and the other end of the resistor 203. The capacitor 202, the resistor 203, and the diode 204 form a snubber circuit that absorbs a transient high voltage accompanying switching.

  The first terminal of the switching element 205 and the other end of the primary side of the transformer 220 are connected to the anode of the diode 204. Switching element 205 is connected in series with the primary winding of transformer 220. The second terminal of the switching element 205 is connected to the negative electrode of the capacitor 201. The control terminal of the switching element 205 is connected to the control IC 200. The control terminal is a terminal for switching between the first and second terminals.

  The switching element 205 is, for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). When the switching element 205 is a MOSFET, the first terminal is a drain terminal, the second terminal is a source terminal, and the control terminal is a gate terminal. In the switching element 205, the first terminal is connected to the transformer 220, the second terminal is connected to the ground terminal, and the third terminal is connected to the control IC 200.

  The control IC 200 is a PFC (Power Factor Correction) driver. The control IC 200 drives the switching element 205. The anode of the diode 208 is connected to the auxiliary winding on the primary side of the transformer 220. The cathode of diode 208 is connected to power supply terminal Vcc1 of control IC 200. The diode 208 supplies power for the control IC 200 from the auxiliary winding of the transformer 220.

  A photocoupler 207 is connected to the control IC 200 via a resistor 206. The resistor 206 and the photocoupler 207 are provided to input information on the secondary side of the transformer 220 to the control IC 200.

  The anode of the diode 209 is connected to one end of the flyback winding on the secondary side of the transformer 220. The diode 209 is connected in series to the secondary side of the transformer 220, and is provided for transmitting a stable voltage to the output side. The cathode of diode 209 is connected to the positive electrode of electrolytic capacitor 214. The negative electrode of the electrolytic capacitor 214 is connected to a ground terminal.

  One end of a battery 250 is connected to the positive electrode of the electrolytic capacitor 214 via a resistor 217. The other end of battery 250 is connected to the negative electrode of electrolytic capacitor 214. The resistor 217 is connected in series with the battery 250, and is provided to limit the current of the battery 250.

  The service power supply circuit 2 includes an output voltage detection circuit. The output voltage detection circuit includes a resistor 215 and a resistor 216 connected in series. The output voltage detection circuit is connected in parallel with the electrolytic capacitor 214. The divided voltage values of the resistors 215 and 216 are input to the microcomputer 50 as a control unit. Thereby, the microcomputer 50 detects the output voltage of the service power supply circuit 2.

  A series circuit of resistors 218 and 219 is connected in parallel with the battery 250. The voltage obtained by dividing the battery voltage by the resistors 218 and 219 is input to the microcomputer 50. The microcomputer 50 calculates a voltage difference between the output voltage of the service power supply circuit 2 detected by the output voltage detection circuit and the voltage obtained by dividing the battery voltage by the resistors 218 and 219. The microcomputer 50 performs an operation using the calculated voltage difference and the resistance value of the resistor 217 to calculate a target value of a signal for turning on and off the switching element 205.

  The microcomputer 50 outputs a rectangular wave according to the calculated target value from an output terminal. An output terminal of the microcomputer 50 is connected to a photocoupler 58 via resistors 55 and 57. Further, a capacitor 56 is connected in parallel with a series circuit formed by the resistor 57 and the photocoupler 58. The rectangular wave output from the microcomputer 50 is averaged by the resistor 55 and the capacitor 56. This voltage is transmitted to the photocoupler 207 provided on the primary side of the transformer 220 via the resistor 57 and the photocoupler 58.

  Thus, the output signal of the microcomputer 50 turns the switching element 205 on and off via the photocoupler 207, the resistor 206, and the control IC 200. As described above, constant current feedback of the insulated flyback circuit is realized. The regular power supply circuit 2 charges the battery 250 connected to the secondary side with a constant current.

  The service power supply circuit 2 includes an input voltage detection circuit 240. The input voltage detection circuit 240 is connected in series to the secondary side of the transformer 220 and detects an input voltage to the service power supply circuit 2. The input voltage detection circuit 240 has a series circuit formed by the first resistor 212 and the second resistor 213. The input voltage detection circuit 240 includes a diode 210 connected to one end of a forward winding on the secondary side of the transformer 220.

  The diode 210 has an anode connected to the secondary side of the transformer 220 and a cathode connected to one end of a series circuit formed by the first resistor 212 and the second resistor 213. The other end of the series circuit is connected to a ground terminal. A smoothing capacitor 211 is connected in parallel with a series circuit formed by the first resistor 212 and the second resistor 213. The voltage divided by the first resistor 212 and the second resistor 213 is input to the microcomputer 50. Thereby, the microcomputer 50 detects the input voltage to the service power supply circuit 2.

  The emergency lighting circuit 3 is configured by a boost type switching circuit. The emergency lighting circuit 3 boosts the output voltage of the battery 250 and lights the LED 30 in an emergency such as a power failure of the external power supply AC or a pseudo power failure.

  A capacitor 31 is connected in parallel to the input terminal of the emergency lighting circuit 3. One end of the battery 250 and one end of the coil 32 are connected to the positive electrode of the capacitor 31. The negative electrode of the capacitor 31 is connected to a ground terminal. The other end of the coil 32 is connected to the anode of the diode 34. The cathode of the diode 34 is connected to the positive electrode of the capacitor 35. The negative electrode of the capacitor 35 is connected to the negative electrode of the capacitor 31. That is, a series circuit connected in the order of the coil 32, the diode 34, and the capacitor 35 is connected in parallel with the capacitor 31.

  A switching element 33 is connected between a connection point between the coil 32 and the diode 34 and a ground terminal. The first terminal of the switching element 33 is connected to the anode of the diode 34. The second terminal of the switching element 33 is connected to the negative electrode of the capacitor 31. The control terminal of the switching element 33 is connected to the microcomputer 50. The switching element 33 is, for example, a MOSFET.

  The anode side of the LED 30 is connected to the positive electrode of the capacitor 35. One end of a sense resistor 38 is connected to the cathode side of the LED 30. The other end of the sense resistor 38 is connected to the negative electrode of the capacitor 35. Although one LED 30 is shown in FIG. 1, the number of LEDs 30 included in the emergency lighting device 100 may be one or more.

  The emergency lighting circuit 3 includes an output voltage detection circuit. The output voltage detection circuit includes a resistor 36 and a resistor 37 connected in series. The output voltage detection circuit is connected in parallel with the capacitor 35. The divided voltage values of the resistors 36 and 37 are input to the microcomputer 50. Thereby, the microcomputer 50 detects the output voltage of the emergency lighting circuit 3.

  One end of the sense resistor 38 is connected to the microcomputer 50. A voltage corresponding to the current flowing through the LED 30 is applied to the sense resistor 38. The voltage applied to the sense resistor 38 is input to the microcomputer 50. The microcomputer 50 compares the voltage detected by the sense resistor 38 with a predetermined target value. The microcomputer 50 outputs a signal to the third terminal of the switching element 33 so that the voltage detected by the sense resistor 38 matches the target value.

  The switching element 33 switches according to an output signal from the microcomputer 50. Thereby, the current flowing through the LED 30 can be matched with the target value. Therefore, constant current feedback of the step-up switching circuit is realized. Thus, the microcomputer 50 controls the emergency lighting circuit 3. When the emergency lighting circuit 3 is of a constant power control type, constant voltage control and constant current control are performed simultaneously.

  In the present embodiment, the battery 250 is charged with the power from the external power supply AC during normal use, and the LED 30 is lit with the power from the battery 250 during an abnormality such as a power failure of the external power supply AC. In general, the emergency lighting circuit 3 for lighting the LED 30 has a fixed lighting period. For this reason, the emergency lighting circuit 3 employs a switching method with good conversion efficiency. Further, by adopting the step-up type, the LED 30 can be turned on even when the number of cells of the battery 250 is small.

  Next, the power generation circuit 4 will be described. The power supply generation circuit 4 generates a power supply for the microcomputer 50. In the power generation circuit 4, the anode of the first diode 42 is connected to the positive electrode of the capacitor 35. The output voltage of the emergency lighting circuit 3 is applied to the capacitor 35. The anode of the second diode 41 is connected to the positive electrode of the electrolytic capacitor 214. The output voltage of the ordinary power supply circuit 2 is applied to the electrolytic capacitor 214.

  The cathode of the first diode 42 and the cathode of the second diode 41 are connected to the regulator 40. The regulator 40 is provided between the cathode of the first diode 42 and the microcomputer 50. The output of the regulator 40 is connected to the power supply terminal Vcc2 of the microcomputer 50. The regulator 40 stabilizes output voltages from the first diode 42 and the second diode 41.

  In the present embodiment, the microcomputer 50 operates by being supplied with power from the service power supply circuit 2 or the emergency lighting circuit 3. At the time of regular use, the regular power supply circuit 2 is operating. Therefore, the power supply generation circuit 4 generates the power supply of the microcomputer 50 via the second diode 41. In an emergency, the emergency lighting circuit 3 operates. For this reason, the power supply generation circuit generates the power supply of the microcomputer 50 from the first diode 42.

  In the present embodiment, the output voltage of battery 250 is lower than the operating voltage of microcomputer 50. Battery 250 is charged to a voltage obtained by dividing the output voltage of service power supply circuit 2 by resistor 217. On the other hand, the microcomputer 50 is supplied with the output voltage of the service power supply circuit 2 which is the voltage applied to the electrolytic capacitor 214 via the second diode 41 and the regulator 40. Thereby, the power supply of the microcomputer 50 during normal use is secured.

  When detecting a power failure of the external power supply AC, the microcomputer 50 operates the emergency lighting circuit 3. When the emergency lighting circuit 3 operates, a voltage obtained by boosting the output voltage of the battery 250 is applied to the capacitor 35. The voltage applied to the capacitor 35 is the output voltage of the emergency lighting circuit 3. At this time, the output voltage of the emergency lighting circuit 3 is supplied to the microcomputer 50 via the first diode 42 and the regulator 40. Thereby, the power supply of the microcomputer 50 at the time of emergency is secured.

  The power generation circuit 4 of the present embodiment includes a first diode 42 provided on a line that supplies power from the emergency lighting circuit 3 to the microcomputer 50. The first diode 42 has an anode connected to the emergency lighting circuit 3 side and a cathode connected to the microcomputer 50 side. The cathode of the first diode 42 is connected to a line that supplies power from the service power supply circuit 2 to the microcomputer 50. Further, the power supply generation circuit 4 includes a second diode 41 provided on a line that supplies power from the service power supply circuit 2 to the microcomputer 50. The second diode 41 has an anode connected to the service power supply circuit 2 and a cathode connected to the cathode of the first diode 42.

  According to such a configuration, the higher of the output voltage of the service power supply circuit 2 and the output voltage of the emergency lighting circuit 3 is supplied to the microcomputer 50. Therefore, the power of the microcomputer 50 can be stably supplied in normal use and in emergency. Further, in the present embodiment, the power generation circuit 4 of the microcomputer 50 is formed by two diodes and the regulator 40. Therefore, the power supply generation circuit 4 can be formed with a simple circuit.

  As described above, in the present embodiment, even when the number of cells of the battery 250 is reduced and the output voltage of the battery 250 is lower than the operating voltage of the microcomputer 50, a constant-voltage booster There is no need to add a switching circuit. Therefore, a power supply for the microcomputer 50 can be generated without using expensive components such as coils or switching elements, and manufacturing costs can be reduced.

  The control circuit 5 includes switches 51 and 52 for pseudo power failure, an infrared sensor 54 for remote control reception, and a display LED 53. The switches 51 and 52, the infrared sensor 54, and the display LED 53 are connected to the microcomputer 50. Signals from the switches 51 and 52, the infrared sensor 54, and the display LED 53 are input to the microcomputer 50, respectively. By processing these signals by the microcomputer 50, a pseudo power failure state can be generated. Therefore, it is possible to confirm whether or not the emergency lighting device 100 can operate normally when the external power supply AC fails.

  Next, the operation of the microcomputer 50 when switching from normal use to emergency will be described. In normal use, the external power supply AC is input. Therefore, a voltage corresponding to the current for charging battery 250 is output from service power supply circuit 2. However, since the output voltage of the ordinary power supply circuit 2 fluctuates, the output voltage is lowered by the regulator 40 and stabilized to generate the power supply of the microcomputer 50.

  In an emergency, the external power supply AC drops. The microcomputer 50 detects a power failure from the detection voltage of the input voltage detection circuit 240. The input voltage detection circuit 240 detects the voltage of the external power supply AC and inputs it to the microcomputer 50. A predetermined threshold is provided in the program of the microcomputer 50. When the input voltage from the input voltage detection circuit 240 becomes smaller than the threshold value, the microcomputer 50 determines that the external power supply AC is in a power failure state. Thereby, the microcomputer 50 starts the operation of the emergency lighting circuit 3. The microcomputer 50 may store the threshold value in the storage unit.

  When the operation of the emergency lighting circuit 3 starts, the voltage of the battery 250 is boosted and the LED 30 is turned on. At this time, the emergency lighting circuit 3 outputs a voltage corresponding to the current of the LED 30. However, since the output voltage of the emergency lighting circuit 3 fluctuates, the voltage is lowered by the regulator 40 and stabilized to generate the power supply of the microcomputer 50. As a result, the power supply source of the microcomputer 50 is switched from the output of the regular power supply circuit 2 to the output of the emergency lighting circuit 3.

  FIG. 2 is a diagram showing voltage waveforms of the ordinary power supply circuit 2 and the emergency lighting circuit 3 according to the first embodiment. When the external power supply AC decreases, the output of the service power supply circuit 2 also decreases. Therefore, in the present embodiment, the operation of the emergency lighting circuit 3 is started before the output voltage of the ordinary power supply circuit 2 becomes lower than the power supply voltage of the microcomputer 50. Thereby, the power supply of the microcomputer 50 can be secured stably.

  The discharge characteristics of the ordinary power supply circuit 2 shown in FIG. 2 are determined by the electrolytic capacitor 214 and the resistance connected to the electrolytic capacitor 214 or the current consumption of the microcomputer 50 or the like. The output voltage characteristic of the emergency lighting circuit 3 shown in FIG. Here, the starting method of the microcomputer 50 includes control of a time change of the output voltage and the current of the microcomputer 50 at the time of starting. For this control, for example, there is control for gradually increasing the output voltage and current after the LED 30 such as soft start and fade-in is turned on. The output voltage characteristic of the emergency lighting circuit 3 is determined according to the boosted voltage when the coil 32 is charged and discharged after the switching element 33 starts oscillating.

  Here, the time required for switching the power supply of the microcomputer 50 is a time for the microcomputer 50 to determine an emergency. By averaging the waveform input to the input voltage detection circuit 240 with the first resistor 212, the second resistor 213, and the capacitor 211, the microcomputer 50 can detect the input voltage. At this time, the time when the microcomputer 50 determines an emergency is determined by the time constant of the first resistor 212, the second resistor 213, and the capacitor 211. However, when the waveform input to the input voltage detection circuit 240 is averaged by the first resistor 212, the second resistor 213, and the capacitor 211, the time constant becomes large, and the time required to determine an emergency may be long. is there.

  Here, at the cathode of the diode 210, a voltage waveform is generated in which a full-wave rectified wave of an AC voltage from the external power supply AC and a rectangular wave generated by switching of the switching element 205 are combined. The frequency of the square wave is the switching frequency. The full-wave rectified wave has a waveform obtained by full-wave rectification of a sine wave of a commercial frequency. The voltage at the cathode of the diode 210 is determined by the turn ratio of the transformer 220.

  The input voltage detection circuit 240 of the present embodiment filters a rectangular wave and does not filter a full-wave rectified wave. That is, the first resistor 212 and the second resistor 213 have a resistance value that filters a rectangular wave and does not filter a full-wave rectified wave. The capacitor 211 has a capacitance that filters a rectangular wave and does not filter a full-wave rectified wave. By selecting the first resistor 212, the second resistor 213, and the capacitor 211, the voltage of the external power supply AC can be detected with a small time constant.

A method for detecting a power failure based on a voltage divided by the first resistor 212 and the second resistor 213 using the input voltage detection circuit 240 will be described. Input voltage _{V a} from the input voltage detecting circuit 240 to the microcomputer 50, satisfies the equation (1). Here, N ₁ is the number of turns of the primary side of the transformer 220, N ₂ is the number of turns of the secondary side of the transformer 220. _Vac is the voltage of the external power supply AC, and _Vf is the forward voltage of the diode 210. R ₁ is the resistance of the first resistor 212, _{R 2} is the resistance of the second resistor 213.

The microcomputer 50, is written the threshold of the peak value of the input voltage V _a for determining power outage in advance. Microcomputer 50, the peak value of the input voltage V _a to the microcomputer 50 becomes smaller than a predetermined threshold value, determines that the external power source AC is in the power failure state.

FIG. 3 is a diagram showing a voltage waveform of the input voltage detection circuit 240 according to the first embodiment. Figure 3 shows one period of the voltage waveform of the input voltage V _a applied to the microcomputer 50. In Figure 3, for example, the _{R 1 330kΩ,} the _{R 2 27kΩ,} 0.5V to _{V f,} turns ratio of the transformer 220 _N 1: _{N 2} 115: is 10. The solid line in FIG. 3, the voltage _{V ac} is 40V, dashed external power supply AC voltage _{V ac} external power source AC is a voltage waveform in the case of 80V.

As shown in FIG. 3, when it is desired to determine an emergency when the voltage _Vac of the external power supply AC is 40 V, the threshold may be set to 0.33 V. Further, when it is desired to determine that the emergency occurs when the voltage _Vac of the external power supply AC is 80 V, the threshold may be set to 0.70 V. By detecting a power failure in this manner, the input voltage detection circuit 240 need not filter the rectangular wave. Therefore, the resistance values of the first resistor 212 and the second resistor 213 can be reduced, and the time required to determine an emergency can be reduced.

  The configurations of the service power supply circuit 2, the emergency lighting circuit 3, and the power generation circuit 4 are not limited to those shown in FIG. The service power supply circuit 2 only needs to be supplied with power from an external power supply AC and charge the battery 250. In addition, the emergency lighting circuit 3 may boost the output voltage of the battery 250 and light the light source. In the power generation circuit 4, only one of the first diode 42 and the second diode 41 may be provided.

  The emergency lighting device 100 according to the present embodiment is a dedicated emergency light. That is, the emergency lighting device 100 does not turn on the light source during normal use, but turns on the LED 30 during an emergency. Thus, the battery 250 can be reliably charged by the regular power supply circuit 2 which is a charging circuit at the time of regular use. Therefore, the power supply of the microcomputer 50 can be ensured in an emergency, and the LED 30 can be turned on. The emergency lighting device 100 may be a dual-purpose or combined-type emergency light. In this case, the emergency lighting device 100 is turned on or off according to a switch operation on a wall or the like in a normal use in the same manner as a general lighting device, and turns on the LED 30 in an emergency similarly to a dedicated type. Further, the emergency lighting device 100 may be a guide light.

  Note that the technical features described in the present embodiment may be appropriately combined and used.

  Reference Signs List 1 input filter circuit, 11 fuse, 12 capacitor, 13 diode bridge, 2 regular power supply circuit, 10 units, 100 emergency lighting device, 200 control IC, 201 capacitor, 202 capacitor, 203 resistor, 204 diode, 205 switching element, 206 Resistor, 207 photocoupler, 208 diode, 209 diode, 210 diode, 211 capacitor, 212 first resistor, 213 second resistor, 214 electrolytic capacitor, 215 resistor, 216 resistor, 217 resistor, 218 resistor, 219 resistor, 240 input voltage Detection circuit, 250 battery, 3 emergency lighting circuit, 30 LED, 31 capacitor, 32 coil, 33 switching element, 34 diode, 35 capacitor, 36 resistor, 37 resistor , 38 sense resistor, 4 power generation circuit, 40 regulator, 41 second diode, 42 first diode, 5 control circuit, 50 microcomputer, 51 switch, 52 switch, 53 display LED, 54 infrared sensor, 55 resistor, 56 capacitor , 57 Resistance, 58 Photocoupler

Claims (10)

Light source,
Batteries and
A power supply circuit that is supplied with power from an external power supply and charges the battery,
An emergency lighting circuit that boosts the output voltage of the battery and turns on the light source;
A control unit for controlling the emergency lighting circuit;
With
The output voltage of the battery is lower than the operation voltage of the control unit,
The emergency illuminating device, wherein the control unit is operated by being supplied with power from the normal power supply circuit or the emergency lighting circuit, and operates the emergency lighting circuit when a power failure of the external power supply is detected.   The emergency lighting device according to claim 1, wherein a higher one of an output voltage of the emergency power supply circuit and an output voltage of the emergency lighting circuit is supplied to the control unit. The battery is charged to a voltage obtained by dividing the output voltage of the service power supply circuit,
The emergency lighting device according to claim 1, wherein the control unit is supplied with the output voltage of the service power supply circuit. A first diode is provided on a line that supplies power to the control unit from the emergency lighting circuit, an anode is connected to the emergency lighting circuit side, and a cathode is connected to the control unit side,
4. The emergency lighting device according to claim 1, wherein the cathode of the first diode is connected to a line that supplies power from the service power circuit to the control unit. 5.   A second diode is provided on the line that supplies power from the service power circuit to the control unit, an anode is connected to the service power circuit side, and a cathode is connected to the cathode of the first diode. The emergency lighting device according to claim 4, wherein:   The emergency lighting device according to claim 4, further comprising a regulator provided between the cathode of the first diode and the control unit. The service power supply circuit,
A switching element;
With a transformer
An input voltage detection circuit that is connected in series to a secondary side of the transformer and detects an input voltage to the service power supply circuit;
With
The emergency lighting device according to claim 1, wherein the control unit detects a power failure based on a detection voltage of the input voltage detection circuit. The external power supply is an AC power supply,
A voltage waveform obtained by combining a full-wave rectified wave of an AC voltage from the external power supply and a rectangular wave generated by switching of the switching element is input to the input voltage detection circuit,
The emergency lighting device according to claim 7, wherein the input voltage detection circuit filters the rectangular wave and does not filter the full-wave rectified wave. The input voltage detection circuit has a series circuit formed by a first resistor and a second resistor,
The first resistor and the second resistor have a resistance value that filters the rectangular wave and does not filter the full-wave rectified wave,
The emergency lighting device according to claim 8, wherein the control unit detects a power failure based on a voltage divided by the first resistor and the second resistor. The input voltage detection circuit includes a diode having an anode connected to the secondary side of the transformer and a cathode connected to one end of the series circuit,
Wherein the number of turns N ₁ of the primary side of the transformer, the winding number N ₂ of the secondary side of the transformer, and the voltage V _ac of the external power supply, and the forward voltage V _f of the diodes, the first resistor resistance value and R _1, and the resistance value R ₂ of the second resistor, and the input voltage V _a from the input voltage detecting circuit to said control unit, the

The filling,
Wherein the control unit, emergency lighting device according to claim 9, characterized in that to determine that the external power supply and the peak value is smaller than a predetermined threshold value of the input voltage V _a is a power failure state.

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