JP2022061081A - Emergency lighting device - Google Patents

Abstract

To provide an emergency lighting device which can charge a battery thereof with less circuit loss when a power-supply voltage is applied by a secondary of a switching circuit to activate a controlling microcomputer.SOLUTION: An emergency lighting device comprises a light source, a regular power-supply circuit to charge a battery for supplying power to the light source from an outside power source, an emergency power-supply circuit to light the light source using the battery by being activated when the outside power source is out, a controller to control the regular power-supply circuit, an activating power-supply to supply an activating power-supply voltage to activate the controller by a secondary of the regular power-supply circuit, and a battery voltage detector to detect a battery voltage of the battery and to input the battery voltage into the controller. The controller controls a voltage to a constant value as follows. When a value of the battery voltage is less than a first threshold indicating the activating power-supply voltage or more, an output voltage from the regular power-supply circuit is the activating power-supply voltage or more.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to emergency lighting equipment.

Conventionally, an emergency lighting device that illuminates the room has been used so that people in the place can safely evacuate in the event of a power outage that occurs in the event of a disaster or accident such as a fire or earthquake in a place where an unspecified number of people gather. May be done. In an emergency lighting device, power is supplied from an external power source during normal use to charge the battery, and in an emergency when power is not supplied from the external power source, power is supplied from the charged battery to light the light source. ..

In such an emergency lighting device, there is one that is generally used as a circuit configuration for realizing battery charging by combining a switching circuit and a linear regulator circuit for constant current control (for example, Patent Document 1).

In the circuit described in Patent Document 1, since a linear regulator for constant current control is configured, the circuit may become complicated and lead to cost increase. On the other hand, there is also a method of controlling the output of the switching circuit with a constant current without using a linear regulator for constant current control and charging the battery with a constant current using only the limiting resistor.

Japanese Unexamined Patent Publication No. 5-308733

However, in a circuit that obtains the operating power supply voltage of the control microcomputer from the secondary side of the switching circuit, when the battery is charged with a constant current using a limiting resistor, it is controlled by lowering the output voltage on the secondary side of the switching circuit. The problem arises that the operating power supply voltage of the computer cannot be obtained. Therefore, it is conceivable to increase the output voltage sufficiently in order to obtain the operating power supply voltage of the control microcomputer from the secondary side of the switching circuit, but in that case, it is necessary to increase the value of the limiting resistor, resulting in circuit loss. There was a problem that it became large.

The present disclosure has been made to solve the above-mentioned problems, and in a circuit for obtaining an operating power supply voltage of a control microcomputer from the secondary side of a switching circuit, it is possible to suppress a large circuit loss and charge a battery. The purpose is to obtain an emergency lighting device that can perform the above.

The emergency lighting device according to the present disclosure includes a light source unit, a regular power supply circuit that charges a battery that supplies power to the light source unit with an external power supply, and an emergency power supply that operates in the event of a power failure of the external power supply and lights the light source unit with the battery. The power supply circuit, the control unit that controls the regular power supply circuit, the operating power supply unit that supplies the operating power supply voltage that operates the control unit from the output side of the regular power supply circuit, and the battery that detects the battery voltage of the battery and supplies the control unit to the control unit. A battery voltage detection unit for inputting voltage is provided, and the control unit determines the output voltage of the regular power supply circuit as the operating power supply voltage or higher when the battery voltage value is less than the first threshold value indicating a value equal to or higher than the power supply voltage. It is an emergency lighting device that controls voltage.

According to the emergency lighting device according to the present disclosure, it is possible to charge the battery while suppressing a large loss in the circuit for obtaining the operating power supply voltage of the control microcomputer from the secondary side of the switching circuit.

It is a circuit block diagram of the emergency lighting apparatus which concerns on Embodiment 1. FIG. It is a figure explaining the output of the normal power supply circuit which concerns on Embodiment 1. FIG. It is a figure explaining the output of the normal power supply circuit which concerns on Embodiment 1. FIG. It is a figure explaining the output of the normal power supply circuit which concerns on Embodiment 2. FIG. It is a figure explaining the output of the normal power supply circuit which concerns on Embodiment 2. FIG.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are designated by the same reference numerals. Duplicate descriptions will be simplified or omitted as appropriate. The present disclosure is not limited to the embodiments described below.

Embodiment 1.
The emergency lighting device according to the first embodiment will be described below.

FIG. 1 is a circuit block diagram of the emergency lighting device 100 according to the first embodiment. The emergency lighting device 100 includes a lighting unit 10 and a light source unit 30. The light source unit 30 is a light source for ensuring brightness in an emergency. The light source unit 30 is, for example, an LED. By using the light source unit 30 as an LED, the energy consumption of the emergency lighting device 100 can be suppressed. The emergency lighting device 100 is equipped with a battery 50 for lighting the light source unit 30. The lighting unit 10 is supplied with electric power from the external power supply AC to charge the battery 50. The external power supply AC is an AC power supply. The battery 50 supplies electric power to the light source unit 30 in an emergency such as a power failure, and lights the light source unit 30. The battery 50 may be a rechargeable battery, and is a secondary battery such as a Ni-Cd battery, a nickel hydrogen battery, or a lithium ion battery.

The lighting unit 10 includes a diode bridge 1, a regular power supply circuit 2, a battery voltage detection unit 4, a power failure detection circuit 5, an emergency power supply circuit 6, a control unit 7, and a notification unit 8.

The diode bridge 1 converts alternating current into direct current. The output of the diode bridge 1 is connected to the regular power supply circuit 2. The low potential side of the output of the diode bridge 1 is connected to the grounding terminal.

The regular power supply circuit 2 is composed of an insulated flyback circuit. The normal power supply circuit 2 is supplied with electric power from the external power supply AC during normal use to charge the battery 50. The normal power supply circuit 2 includes a capacitor 11, a capacitor 13, a capacitor 24, a resistor 12, a resistor 17, a resistor 22, a resistor 23, a transformer 14, a switching element 15, a control IC (Integrated Circuit) 16, a photocoupler 18, and a pseudo power failure generation circuit. A 19, a diode 20, and an electrolytic capacitor 21 are provided.

In the normal power supply circuit 2, a capacitor 11 is connected in parallel with the output of the diode bridge 1 in order to reduce the ripple due to the full wave of the external power supply AC and switching. One end of the resistor 12 and one end of the primary side of the transformer 14 are connected to the positive electrode of the capacitor 11.

The first terminal of the switching element 15 is connected in series to the other end of the primary side of the transformer 14. The second terminal of the switching element 15 is connected to the negative electrode of the capacitor 11. The control terminal of the switching element 15 is connected to the control IC 16. The control terminal is a terminal for switching between the first terminal and the second terminal. The control IC 16 controls the regular power supply circuit 2. Here, the term "civil time" indicates a state in which the external power supply AC is not in a power failure state or a pseudo power failure state. Unless otherwise specified in the following description, the power failure state or the pseudo power failure state are collectively referred to as a power failure state.

The switching element 15 is, for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effective Transistor). When the switching element 15 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 15, the first terminal is connected to the transformer 14, the second terminal is connected to the grounding terminal, and the control terminal is connected to the control IC 16.

The control IC 16 is, for example, a PFC (Power Factor Direction) driver. The control IC 16 drives the switching element 15. The circuit connected in the order of the resistor 12 and the capacitor 13 in parallel with the capacitor 11 supplies the power supply of the control IC 16.

A photocoupler 18 is connected to the control IC 16 via a resistor 17. The resistor 17 and the photocoupler 18 are provided to input information on the secondary side of the transformer 14 to the control IC 16.

The regular power supply circuit 2 includes a pseudo power failure generation circuit 19. The pseudo power failure generation circuit 19 is a circuit capable of generating a pseudo power failure state. The pseudo power failure generation circuit 19 includes a pseudo power failure inspection switch, a remote control inspection button, and the like. The pseudo power failure generation circuit 19 can operate the control IC 16 by, for example, turning on the pseudo power failure inspection switch. As a result, the pseudo power failure generation circuit 19 can create a pseudo power failure state. Therefore, it is possible to confirm whether or not the emergency lighting device 100 operates normally in the event of a power failure of the external power supply AC.

The anode of the diode 20 is connected to one end of the flyback winding on the secondary side of the transformer 14. The diode 20 is connected in series to the secondary side of the transformer 14 and is provided to transmit a stable voltage to the output side. The positive electrode of the electrolytic capacitor 21 is connected to the cathode of the diode 20. The negative electrode of the electrolytic capacitor 21 is connected to the grounding terminal.

In the grounding path of the normal power supply circuit 2, the primary side and the secondary side of the transformer 14 are insulated by the capacitor 24.

The regular power supply circuit 2 includes a regular power supply output voltage detection unit. The normal power supply output voltage detection unit is composed of a resistance 22 and a resistance 23 connected in series. The normal power supply output voltage detection unit is connected in parallel with the electrolytic capacitor 21. The divided values of the resistance 22 and the resistance 23 are input to the microcomputer which is the control unit 7. As a result, the control unit 7 detects the output voltage of the regular power supply circuit 2.

The regular power supply circuit 2, which is a charging circuit, charges the battery 50. The resistor 31 is connected between the flyback winding of the transformer 14 and the battery 50. The positive electrode of the battery 50 is connected to the other end of the resistor 31. The resistor 31 is connected in series with the battery 50 and is provided to limit the current of the battery 50. The negative electrode of the battery 50 is connected to the grounding terminal. That is, a resistor 31 and a battery 50 are connected in series to the output end of the regular power supply circuit 2.

The battery voltage detection unit 4 is composed of a resistance 51 and a resistance 52 connected in series. A series circuit of the resistor 51 and the resistor 52 is connected in parallel with the battery 50. Further, the battery voltage detection unit 4 is connected in parallel with the capacitor 32. The voltage obtained by dividing the battery voltage by the resistance 51 and the resistance 52 is input to the control unit 7. The control unit 7 calculates the potential difference between the output voltage of the normal power supply circuit 2 detected by the normal power supply output voltage detection unit and the voltage obtained by dividing the battery voltage by the resistors 51 and 52. The control unit 7 performs an operation based on the calculated potential difference, and calculates a target value of a signal for turning on / off the switching element 15.

The control unit 7 outputs a target value of a signal for turning on / off the switching element 15 from the output terminal. A photocoupler 25 is connected to the output terminal of the control unit 7. The signal output from the control unit 7 is transmitted to the photocoupler 18 provided on the primary side of the transformer 14 via the photocoupler 25.

The output signal of the control unit 7 is transmitted to the control IC 16 via the photocoupler 18 and the resistor 17. The control IC 16 controls the switching element 15 on and off so that the target value of the output voltage and the output voltage of the normal power supply circuit 2 match with the output signal received from the control unit 7. That is, the control unit 7 controls the normal power supply circuit 2 via the control IC 16. From the above, feedback control by the regular power supply circuit 2 which is an isolated flyback circuit is realized.

The emergency power supply circuit 6 is composed of a step-up switching circuit. The emergency power supply circuit 6 operates in an emergency such as a power failure of the external power supply AC, boosts the output voltage of the battery 50, and lights the light source unit 30. That is, the emergency power supply circuit 6 receives power from the battery 50, which is a DC power supply, and lights the light source unit 30.

A capacitor 32 is connected in parallel to the input end of the emergency power supply circuit 6. The positive electrode of the battery 50 and one end of the coil 53 are connected to the positive electrode of the capacitor 32. The negative electrode of the capacitor 32 is connected to the grounding terminal. The other end of the coil 53 is connected to the anode of the diode 54. The cathode of the diode 54 is connected to the positive electrode of the capacitor 58. The negative electrode of the capacitor 58 is connected to the negative electrode of the capacitor 32. That is, a series circuit in which the coil 53, the diode 54, and the capacitor 58 are connected in this order is connected in parallel with the capacitor 32.

A switching element 55 is connected between the connection point of the coil 53 and the diode 54 and the grounding terminal. The first terminal of the switching element 55 is connected to the anode of the diode 54. The second terminal of the switching element 55 is connected to the negative electrode of the capacitor 58. The control terminal of the switching element is connected to the control unit 7. The switching element 55 is, for example, a MOSFET.

The anode side of the light source unit 30 is connected to the positive electrode of the capacitor 58. One end of the resistor 59 is connected to the cathode side of the light source unit 30. The other end of the resistor 59 is connected to the negative electrode of the capacitor 58. In FIG. 1, two LEDs are shown in the light source unit 30, but the number of light sources included in the emergency lighting device 100 may be one or more.

The power failure detection circuit 5 is a circuit that detects a power failure state of the external power supply AC. The power failure detection circuit 5 monitors whether or not the external power supply AC is in a power failure state by a signal of the output voltage from one end of the flyback winding on the secondary side of the transformer 14, and detects the power failure state of the external power supply AC. The power failure detection circuit 5 is connected to the control unit 7. When the power failure detection circuit 5 detects a power failure of the external power supply AC, it transmits a signal indicating that the external power supply AC is in a power failure state to the control unit 7. When the control unit 7 receives the signal from the power failure detection circuit, the control unit 7 operates the emergency power supply circuit 6. That is, the control unit 7 controls the emergency power supply circuit 6.

The emergency power supply circuit 6 includes an emergency power supply output voltage detection unit. The emergency power supply output voltage detection unit is composed of a resistance 56 and a resistance 57 connected in series. The emergency power supply output voltage detection unit is connected in parallel with the capacitor 58. The divided values of the resistance 56 and the resistance 57 are input to the control unit 7. As a result, the control unit 7 detects the output voltage of the emergency power supply circuit 6.

The emergency power supply circuit 6 includes an output current detection unit. The output current detection unit is composed of a resistance 59 connected to the cathode side of the LED. When the emergency power supply circuit 6 operates, a voltage obtained by boosting the output voltage of the battery 50 is applied to the capacitor 58. The voltage applied to the capacitor 58 is the output voltage of the emergency power supply circuit 6. A voltage corresponding to the current flowing through the light source unit 30 is applied to the resistance 59. The voltage applied to the resistor 59 is input to the control unit 7. As a result, the control unit 7 detects the output current of the emergency power supply circuit 6. Constant power feedback control is performed by setting the target value of the output current with the output voltage detected by the emergency power supply output voltage detection unit. In this way, the electric power of the light source unit 30 is controlled to be constant.

Subsequently, the control unit 7 will be described. The control unit 7 is composed of a microcomputer. The microcomputer includes a CPU that performs various operations, a memory, and a timer. The memory is composed of, for example, a non-volatile memory.

The control unit 7 transmits a signal indicating the state of the connected battery 50 to the notification unit 8. Upon receiving a signal from the control unit 7, the notification unit 8 notifies the outside of the emergency lighting device 100 of the state of the battery 50. The notification unit 8 is, for example, a notification LED, and makes the LED blink to notify the outside that the state of the battery 50 is abnormal. Further, the notification unit 8 turns on the notification LED to notify the outside that the state of the battery 50 is normal. Further, the notification unit 8 turns off the notification LED and notifies the outside that the battery 50 is not connected.

When notifying the state of the battery 50 to the outside, a charging LED for notifying whether or not charging is performed by the normal power supply circuit 2 may be used. By doing so, it is not necessary to newly add an LED as the notification unit 8. The notification unit 8 is not limited to the notification LED, and may be a sound output unit that outputs sound or voice, such as a speaker, and the same applies to other forms described below.

Next, the operating power supply unit 3 will be described. The operating power supply unit 3 supplies power to the microcomputer which is the control unit 7. The operating power supply unit 3 supplies a power supply voltage for operating the control unit 7 from the output side of the regular power supply circuit 2. The operating power supply unit 3 is composed of a diode 33 and a regulator 34. The diode 33 is provided on a line for supplying power from the normal power supply circuit 2 to the control unit 7. The anode of the diode 33 is connected to the output side of the regular power supply circuit 2. That is, the anode of the diode 33 is connected to one end of the flyback winding on the secondary side of the transformer 14. The diode 33 is connected in series with the diode 20 and is provided to transmit a stable voltage to the output side.

The cathode of the diode 33 is connected to the control unit 7 side on the line that supplies power to the control unit 7 from the normal power supply circuit 2. Specifically, the cathode of the diode 33 is connected to the regulator 34. The regulator 34 is provided between the diode 33 and the control unit 7. That is, the regulator 34 is provided between the cathode of the diode 33 and the control unit 7. The output of the regulator 34 is connected to the power supply terminal of the control unit 7. The regulator 34 stabilizes the output voltage output from the diode 33. That is, the control unit 7 operates by obtaining power from the operating power supply unit 3. Here, the operating power supply voltage for operating the control unit 7 is Vcc.

The control unit 7 compares the divided value of the battery voltage input from the battery voltage detection unit 4 with a preset threshold value, and controls the output voltage of the normal power supply circuit 2. The threshold value may be stored in the memory of the microcomputer, and the control unit 7 may read the threshold value from the memory and compare it with the divided value of the battery voltage. Hereinafter, the control unit 7 will be described as preliminarily storing the threshold value in the memory.

2 and 3 are diagrams illustrating the output of the regular power supply circuit 2 according to the first embodiment. FIG. 2A shows the relationship between voltage and time, and FIG. 2B shows the relationship between current and time. Further, FIG. 3A shows the relationship between voltage and time, and FIG. 3B shows the relationship between current and time. Here, the output voltage of the regular power supply circuit 2 is Vout, the battery voltage detected by the battery voltage detection unit 4 is Vbat, and the threshold value related to the voltage stored in advance in the control unit 7 is the first threshold value Vth1. Further, the current for charging the battery 50 is defined as the charging current Ibat.

A case where the battery 50 is charged by the normal power supply circuit 2 will be described. In the following description, the first threshold value Vth1 is a value that is equal to or higher than the operating power supply voltage Vcc for operating the control unit 7. Specifically, the first threshold value Vth1 is a voltage obtained by subtracting the forward voltage Vf that drops in the diode 33 and the voltage that drops in the regulator 34 from the output voltage Vout of the normal power supply circuit 2.

When the battery voltage Vbat is less than the first threshold value Vth1, it is necessary to charge the battery 50. Therefore, the control unit 7 sets and controls the feedback target voltage so that the output voltage Vout of the normal power supply circuit 2 becomes constant. I do. At this time, as shown in FIG. 2B, since the regular power supply circuit 2 performs constant voltage control, the charging current Ibat is higher than that in the case of constant current control.

When the battery voltage Vbat is less than the first threshold value Vth1 and the battery 50 is charged by constant current control, if the output voltage Vout of the normal power supply circuit 2 is lowered, the operating power supply voltage Vcc cannot be secured. As described above, the operating power supply voltage Vcc can be secured by setting the first threshold voltage Vth1 to be equal to or higher than the operating power supply voltage Vcc and performing constant voltage control. In other words, since the constant voltage control is performed with the output voltage Vout set to the operating power supply voltage Vcc or more, the operating power supply voltage Vcc can be secured. Therefore, it is not necessary to increase the value of the resistance 31 in order to secure the operating power supply voltage Vcc from the output voltage Vout of the normal power supply circuit 2, that is, to increase the output voltage Vout, so that the loss in the circuit becomes large. It can be suppressed. That is, the battery 50 can be charged with high efficiency.

When the battery voltage Vbat rises by charging the battery 50 and becomes equal to or higher than the first threshold value Vth1, the control unit 7 sets a feedback target voltage so that the voltage across the resistor 31 becomes constant, and performs control. At this time, since the regular power supply circuit 2 is controlled by a constant current, the charging current Ibat flowing through the battery 50 is constant. In this way, since the control unit 7 controls the charging current Ibat to be constant, the charging current Ibat does not flow excessively when the battery 50 is near full charge, and the battery 50 is in an overcharged state. It can be suppressed. When the battery voltage Vbat is equal to or higher than the first threshold value Vth1, the regular power supply circuit 2 does not necessarily have to be controlled by a constant current.

Next, FIG. 3 will be described. When the battery voltage Vbat drops and falls below the first threshold value Vth1, the control unit 7 sets and controls the feedback target voltage so that the output voltage Vout of the normal power supply circuit 2 becomes constant. At this time, as shown in FIG. 3B, since the regular power supply circuit 2 is controlled by a constant voltage, the Ibat is in a higher state than in the case where the constant current control is performed.

The normal power supply circuit 2 can secure the operating power supply voltage Vcc by setting the first threshold value Vth1 to be equal to or higher than the operating power supply voltage Vcc and performing constant voltage control.

As described above, by switching the output voltage Vout of the normal power supply circuit 2 between constant voltage control and constant current control according to the value of the battery voltage Vbat, it is possible to suppress a large loss in the circuit and achieve high efficiency. It is possible to obtain an emergency lighting device capable of charging the battery 50.

As described above, the emergency lighting device 100 according to the first embodiment includes a light source unit 30, a regular power supply circuit 2 that charges a battery 50 that supplies power to the light source unit 30 by an external power supply AC, and an external power supply AC. An emergency power supply circuit 6 that operates in the event of a power failure and turns on the light source unit 30 by the battery 50, a control unit 7 that controls the normal power supply circuit 2, and an operating power supply voltage that operates the control unit 7 from the output side of the normal power supply circuit 2. A power supply unit 3 for supplying power and a battery voltage detection unit 4 for detecting the battery voltage of the battery 50 and inputting the battery voltage to the control unit 7. When the value is equal to or higher than the voltage and less than the first threshold value, the emergency lighting device 100 controls the normal power supply circuit 2 at a constant voltage.

According to such a configuration, it is possible to suppress a large loss in the circuit for obtaining the operating power supply voltage of the control microcomputer from the secondary side of the switching circuit, and it is possible to charge the battery 50 with high efficiency. can.

Further, the emergency lighting device 100 may control the normal power supply circuit 2 with a constant current when the value of the battery voltage is equal to or higher than the first threshold value.

According to such a configuration, when the battery 50 is near full charge, the charging current Ibat does not flow excessively, and it is possible to prevent the battery 50 from being overcharged.

Embodiment 2.
Subsequently, the emergency lighting device 100 according to the second embodiment will be described. 4 and 5 are diagrams illustrating the output of the regular power supply circuit 2 according to the second embodiment. In the following description, a configuration different from the first embodiment will be mainly described. The emergency lighting device 100 according to the second embodiment is different from the emergency lighting device 100 according to the first embodiment in that the control unit 7 stores the second threshold value Vth2 in the memory, and has other configurations. Is the same as that of the first embodiment, and thus the description thereof will be omitted.

The control unit 7 stores the first threshold value Vth1 and the second threshold value Vth2 in the memory in advance. The second threshold value Vth2 is a threshold value having a value larger than the first threshold value Vth1. 4 and 5 show a first threshold value Vth1 and a second threshold value Vth2, respectively.

FIG. 4 is a diagram illustrating an output of the regular power supply circuit 2 according to the second embodiment. FIG. 4 shows the transition to the point where the battery 50 is charged by the normal power supply circuit 2 and the battery voltage Vbat exceeds the second threshold value Vth2.

The second threshold value Vth2 is a value indicating the state of the battery voltage at which the battery 50 is fully charged. Here, the term “fully charged” is not limited to the state in which the battery 50 is fully charged, but includes the state in which the battery 50 is in a voltage state of 80% or more of the voltage in the fully charged state.

When the battery voltage Vbat is equal to or higher than the first threshold value and less than the second threshold value, the control unit 7 sets a feedback target voltage so that the voltage across the resistor 31 becomes constant, and performs control. At this time, since the regular power supply circuit 2 is controlled by a constant current, the charging current Ibat flowing through the battery 50 is constant. The case where the battery voltage Vbat is less than the first threshold value Vth1 is the same as that of the first embodiment and is omitted. This also applies to FIG. 5 described below.

When the battery voltage Vbat rises and becomes equal to or higher than the second threshold value, the control unit 7 sets a feedback target voltage so that the output voltage of the normal power supply circuit 2 becomes constant, and performs control. At this time, since the normal power supply circuit 2 is controlled by a constant voltage, the charging current Ibat decreases.

For example, when the battery 50 is not connected, a phenomenon occurs in which the battery voltage Vbat detected by the battery voltage detection unit 4 shows a value substantially equal to or close to the output voltage Vout of the normal power supply circuit 2. However, when the battery voltage is fully charged, the normal power supply circuit 2 is controlled by a constant voltage, so that the overvoltage state does not occur even when the battery 50 is not connected.

Next, FIG. 5 will be described. When the battery voltage Vbat drops and falls below the second threshold value Vth2, the control unit 7 sets a feedback target voltage so that the voltage across the resistor 31 becomes constant, and performs control. At this time, as shown in FIG. 5B, since the regular power supply circuit 2 is controlled by a constant current, the charging current Ibat is constant.

As described above, in the emergency lighting device 100 according to the second embodiment, when the value of the battery voltage Vbat is equal to or higher than the second threshold value Vth2, which is a value indicating the state of the fully charged battery voltage Vbat, the control unit 7 Controls the regular power supply circuit 2 at a constant voltage, and when the value of the battery voltage Vbat is equal to or higher than the first threshold Vth1 and less than the second threshold Vth2, the control unit 7 controls the regular power supply circuit 2 at a constant current. Device 100.

According to such a configuration, when the battery voltage is fully charged, the normal power supply circuit 2 is controlled by a constant voltage, so that the overvoltage state does not occur even when the battery 50 is not connected.

Although the embodiments of the present disclosure have been described above, the emergency lighting device 100 of the present disclosure is not limited to the embodiments described in the first and second embodiments, and shows a part of the contents of the present disclosure. It is a thing. The emergency lighting device of the present disclosure can be combined with another known technique, or a part of the configuration can be omitted or changed by appropriately combining the emergency lighting devices without departing from the gist of the present disclosure. Is.

1 Diode bridge, 2 Regular power supply circuit, 3 Operating power supply unit, 4 Battery voltage detection unit, 5 Power failure detection circuit, 6 Emergency power supply circuit, 7 Control unit, 8 Notification unit, 10 Lighting unit, 11 Capacitor, 12 Resistance, 13 Capacitor, 14 Transformer, 15 Switching element, 16 Control IC, 17 Resistance, 18 Photocoupler, 19 Pseudo power failure generation circuit, 20 Diode, 21 Electrolytic capacitor, 22 Resistance, 23 Resistance, 24 Capacitor, 25 Photocoupler, 30 Light source , 31 resistance, 32 capacitor, 33 capacitor, 34 regulator, 50 battery, 51 resistance, 52 resistance, 53 coil, 54 diode, 55 switching element, 56 resistance, 57 resistance, 58 capacitor, 59 resistance, 100 emergency lighting device

Claims (5)

Light source part and
A regular power supply circuit that charges a battery that supplies power to the light source unit with an external power supply, and
An emergency power supply circuit that operates in the event of a power failure of the external power supply and lights the light source unit by the battery.
The control unit that controls the regular power supply circuit and
An operating power supply unit that supplies an operating power supply voltage for operating the control unit from the output side of the regular power supply circuit, and
A battery voltage detection unit that detects the battery voltage of the battery and inputs the battery voltage to the control unit,
Equipped with
The control unit
When the value of the battery voltage is less than the first threshold value indicating a value equal to or higher than the operating power supply voltage, the emergency lighting device controls the output voltage of the normal power supply circuit to a constant voltage equal to or higher than the operating power supply voltage. The control unit
The emergency lighting device according to claim 1, wherein when the value of the battery voltage is equal to or higher than the first threshold value, the normal power supply circuit is controlled by a constant current. The control unit
When the value of the battery voltage is equal to or higher than the second threshold value indicating the state of the fully charged battery voltage, the normal power supply circuit is controlled by a constant voltage.
The emergency lighting device according to claim 1 or 2, wherein when the value of the battery voltage is equal to or higher than the first threshold value and less than the second threshold value, the normal power supply circuit is controlled by a constant current. The first aspect of the present invention includes a diode provided on a line for supplying power from the normal power supply circuit to the control unit, an anode connected to the output side of the normal power supply circuit, and a cathode connected to the control unit side. Item 3. The emergency lighting device according to any one of Items 3. The emergency lighting device according to claim 4, further comprising a regulator provided between the diode and the control unit.

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