JP6025404B2 - Power supply device and lighting device - Google Patents

Description

  The present invention relates to a power conversion device that converts power stored in a storage battery or the like into power supplied to a load circuit, and a power supply device and lighting device using the power conversion device.

  There is a device that charges a storage battery with power supplied from an external power source, obtains DC power from the storage battery at the time of a power failure, and converts it into AC power that operates an AC load such as a discharge lamp.

Japanese Patent Laid-Open No. 2001-230090

When operating a DC load such as an LED, it is necessary to convert DC power obtained from a storage battery into DC power having a different voltage and current. In general, a switching power supply circuit such as a boost converter circuit is used for the DC / DC conversion circuit.
An object of the present invention is to realize DC / DC conversion with a simpler configuration than, for example, a general switching power supply circuit.

  The power conversion device according to the present invention includes a collector resonant inverter circuit and a rectifier circuit that rectifies the output of the collector resonant inverter circuit.

  According to the power conversion device of the present invention, since direct current to direct current conversion can be realized with a simple configuration, the number of components can be reduced, the manufacturing cost can be reduced, the reliability can be improved, and the power loss can be reduced.

FIG. 3 is a diagram showing a block configuration of a common emergency lighting fixture 10 in the first embodiment. FIG. 3 is a circuit diagram showing a configuration of a switching circuit 22 in the first embodiment. FIG. 3 is a circuit diagram illustrating configurations of a switching circuit 22, a charging power supply circuit 34, a power storage circuit 35, and a power failure detection circuit 24 in the first embodiment. FIG. 3 is a circuit diagram showing a configuration of a DC / DC conversion circuit 36 according to the first embodiment. FIG. 6 is a circuit diagram showing a configuration of a switching circuit 22, a charging power supply circuit 34, a power storage circuit 35, and a power failure detection circuit 24 in the second embodiment. The figure which shows the operation example of the common emergency use lighting fixture 10 in Embodiment 2. FIG.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS.

  FIG. 1 is a diagram showing a block configuration of a common emergency lighting apparatus 10 according to this embodiment.

The common emergency lighting fixture 10 (lighting device) includes a light source circuit 11 and a lighting device 12.
The light source circuit 11 (load circuit) includes a light source such as an LED. The light source circuit 11 turns on the light source with the power supplied from the lighting device 12.
The lighting device 12 (power supply device) supplies power to the light source circuit 11. The lighting device 12 includes, for example, a regular lighting circuit 21, a switching circuit 22, an emergency lighting circuit 23, and a power failure detection circuit 24.

  The regular lighting circuit 21 (conversion circuit) converts the power supplied from the external power supply 90 into power supplied to the light source circuit 11. The external power source 90 is an AC power source such as a commercial power source. The power supplied to the light source circuit 11 is, for example, DC power. For example, the regular lighting circuit 21 adjusts the power supplied to the light source circuit 11 so that the current flowing through the light source circuit 11 matches a predetermined target current.

The emergency lighting circuit 23 stores the power supplied from the external power supply 90 and supplies the stored power to the light source circuit 11 when the power supply from the external power supply 90 is stopped due to a power failure or the like. Convert to The emergency lighting circuit 23 includes, for example, a charging power supply circuit 34, a power storage circuit 35, and a DC / DC conversion circuit 36.
The power storage circuit 35 has a storage battery and stores electric power in the storage battery. The storage battery is, for example, a nickel metal hydride storage battery or a lithium ion storage battery.
The charging power supply circuit 34 (storage battery charging circuit) converts the power supplied from the external power supply 90 into direct current power for charging the storage battery of the storage circuit 35.
The DC / DC conversion circuit 36 (power conversion device) converts the power stored in the storage battery of the power storage circuit 35 into power supplied to the light source circuit 11.

  The switching circuit 22 selects either the regular lighting circuit 21 or the emergency lighting circuit 23 and connects it to the light source circuit 11. When there is power supply from the external power supply 90, the switching circuit 22 electrically connects the output of the regular lighting circuit 21 to the light source circuit 11 and supplies the light converted by the regular lighting circuit 21 to the light source circuit 11. When there is no power supply from the external power supply 90 due to a power failure or the like, the switching circuit 22 electrically connects the output of the emergency lighting circuit 23 to the light source circuit 11 and the power converted by the emergency lighting circuit 23 is supplied to the light source circuit 11. Supply.

  The power failure detection circuit 24 determines whether there is power supply from the external power supply 90. When the power failure detection circuit 24 determines that there is no power supply from the external power supply 90, the emergency lighting circuit 23 converts the power stored in the storage battery of the power storage circuit 35 into power supplied to the light source circuit 11. The switching circuit 22 electrically connects the output of the emergency lighting circuit 23 to the light source circuit 11, and the light source of the light source circuit 11 is lit by the electric power stored in the storage battery.

  FIG. 2 is a circuit diagram showing a configuration of the switching circuit 22 in this embodiment.

The switching circuit 22 is, for example, an electromagnetic relay (electromagnetic relay) having a relay coil 221 and two relay switches 222 and 223.
Each relay switch 222, 223 has a common terminal, an open terminal, and a connection terminal. When no current flows through the relay coil 221, the common terminal and the connection terminal are electrically connected, and the open terminal is not electrically connected. When a current flows through the relay coil 221, the common terminal and the open terminal are electrically connected, and the connection terminal is not electrically connected.
The relay switch 222 is disposed on the low potential side. The common terminal of the relay switch 222 is electrically connected to the low potential side input of the light source circuit 11. The open terminal of the relay switch 222 is electrically connected to the low potential side output of the regular lighting circuit 21. The connection terminal of the relay switch 222 is electrically connected to the low potential side output of the emergency lighting circuit 23 (see FIG. 4).
The relay switch 223 is disposed on the high potential side. The common terminal of the relay switch 223 is electrically connected to the high potential side input of the light source circuit 11. The open terminal of the relay switch 223 is electrically connected to the high potential side output of the regular lighting circuit 21. The connection terminal of the relay switch 223 is electrically connected to the high potential side output of the emergency lighting circuit 23.
The switching circuit 22 may be a semiconductor relay (solid state relay). As a result, failure due to contact wear or the like is eliminated, so that the reliability is increased and the life can be extended.

  FIG. 3 is a circuit diagram showing the configuration of the switching circuit 22, the charging power supply circuit 34, the storage circuit 35, and the power failure detection circuit 24 in this embodiment.

  The charging power supply circuit 34 includes, for example, a full-wave rectifier circuit 41, a rectifier element 43, a switching power supply circuit 42, a constant voltage element 44, a photocoupler 45, and a switching element 46.

  The full-wave rectifier circuit 41 is, for example, a diode bridge circuit in which four rectifier diodes are bridge-connected. The full-wave rectification circuit 41 performs full-wave rectification on the voltage waveform of the power supplied from the external power supply 90 to generate a pulsating flow.

  The rectifier element 43 is electrically connected between the output of the full-wave rectifier circuit 41 and the input of the switching power supply circuit 42.

  The switching power supply circuit 42 is, for example, a flyback converter circuit including an input capacitor 420, a control circuit 421, a transformer 422, a switching element 425, a rectifying element 426, and a smoothing capacitor 427. The input capacitor 420 is electrically connected to the input of the switching power supply circuit 42. The transformer 422 has a primary winding 423 and a secondary winding 424. The switching element 425 is, for example, an enhancement type nMOSFET. The primary winding 423 and the switching element 425 are electrically connected in series with each other, and are electrically connected in parallel with the input capacitor 420 to the input of the switching power supply circuit 42. The smoothing capacitor 427 is electrically connected to the output of the switching power supply circuit 42. The secondary winding 424 and the rectifying element 426 are electrically connected in series with each other, and are electrically connected in parallel with the smoothing capacitor 427 to the output of the switching power supply circuit 42. The control circuit 421 turns on and off the switching element 425 at a high frequency.

The constant voltage element 44 is turned on when the voltage between both ends reaches a predetermined threshold voltage. The constant voltage element 44 is, for example, a Zener diode.
The photocoupler 45 includes an LED 451 and a phototransistor 452.
The constant voltage element 44 and the LED 451 are electrically connected in series with each other and connected to the output of the switching power supply circuit 42. Thus, when the output voltage of the switching power supply circuit 42 reaches a predetermined voltage (the sum of the threshold voltage of the constant voltage element 44 and the forward drop voltage of the LED 451), the constant voltage element 44 is turned on and the LED 451 is turned on. Therefore, the phototransistor 452 is turned on.
The switching element 46 is electrically connected to the phototransistor 452 in parallel.

When the phototransistor 452 or the switching element 46 is on, the control circuit 421 of the switching power supply circuit 42 stops turning on and off the switching element 425 and continuously turns off the switching element 425.
When both the phototransistor 452 and the switching element 46 are off, the control circuit 421 of the switching power supply circuit 42 turns on and off the switching element 425 at a high frequency.

  When the switching element 46 is off, if the output voltage of the switching power supply circuit 42 is smaller than a predetermined voltage, the phototransistor 452 is turned off, so that the control circuit 421 turns on and off the switching element 425 at a high frequency and charges the smoothing capacitor 427. To do. Thus, when the output voltage of the switching power supply circuit 42 reaches a predetermined voltage, the phototransistor 452 is turned on, and the control circuit 421 stops turning on and off the switching element 425, so that the smoothing capacitor 427 is not charged. Accordingly, when the output voltage of the switching power supply circuit 42 becomes smaller than a predetermined voltage, the phototransistor 452 is turned off, and the control circuit 421 restarts the switching element 425 on / off. In this way, the output voltage of the switching power supply circuit 42 is always kept near a predetermined voltage.

  When the switching element 46 is on, the control circuit 421 continues to turn off the switching element 425 regardless of the state of the phototransistor 452. That is, the switching power supply circuit 42 does not operate.

  The power failure detection circuit 24 includes, for example, a switching element 241, a photocoupler 242, a resistor 245, a drive circuit 246, and a determination circuit 247.

The photocoupler 242 includes an LED 243 and a phototransistor 244. The LED 243 and the switching element 241 are electrically connected in series with each other, electrically connected to the control input of the switching element 46, and electrically connected to the output of the drive circuit 246. The resistor 245 and the phototransistor 244 are electrically connected in series with each other and electrically connected to the output of the charging power supply circuit 34.
The drive circuit 246 (photocoupler LED drive circuit) obtains electric power from a connection point between the rectifying element 43 and the input of the switching power supply circuit 42 and lights the LED 243.

  The determination circuit 247 (external power supply determination circuit) compares the potential at the connection point between the full-wave rectifier circuit 41 and the rectifier element 43 with a predetermined threshold voltage. If power is supplied from the external power supply 90, a period during which the potential at the connection point between the full-wave rectifier circuit 41 and the rectifier element 43 exceeds the threshold voltage during one cycle of the external power supply 90 (for example, 20 ms if the frequency is 50 Hz). There is. If no power is supplied from the external power supply 90, there is no period in which the potential at the connection point between the full-wave rectifier circuit 41 and the rectifier element 43 exceeds the threshold voltage. The determination circuit 247 determines that power is supplied from the external power supply 90 if there is a period in which the potential at the connection point between the full-wave rectifier circuit 41 and the rectifier element 43 exceeds the threshold voltage during a predetermined period. The switching element 241 is turned on. If there is no period in which the potential at the connection point between the full-wave rectifier circuit 41 and the rectifier element 43 exceeds the threshold voltage during the predetermined period, it is determined that the power supply from the external power supply 90 is stopped, and the switching element 241 is turned off.

When power is supplied from the external power supply 90, the determination circuit 247 turns on the switching element 241. Therefore, the LED 243 is lit by the power supplied from the drive circuit 246 and the phototransistor 244 is turned on.
When the power supply from the external power supply 90 is stopped, the determination circuit 247 turns off the switching element 241, so the LED 243 is not lit and the phototransistor 244 is turned off.

The switching element 46 of the switching power supply circuit 42 is turned on when the voltage across the switching element 241 is higher than a predetermined threshold voltage.
When electric power is supplied from the external power supply 90, the voltage across the switching element 241 is almost zero because the switching element 241 is on. The switching element 46 is turned off, and the switching power supply circuit 42 operates at a constant voltage.
When the power supply from the external power supply 90 is stopped, the switching element 241 is turned off, and the voltage across the switching element 241 becomes substantially equal to the maximum voltage output from the drive circuit 246. The switching element 46 is turned on, and the switching power supply circuit 42 stops operating. Thereafter, when the input capacitor 420 is discharged, the switching element 46 is turned off. However, since the power supply from the power supply is stopped, the control circuit 421 does not operate. Therefore, until the power supply from the external power supply 90 is resumed. The switching power supply circuit 42 remains stopped.

The power storage circuit 35 includes, for example, a charge / discharge control circuit 51 and a storage battery 52.
The charge / discharge control circuit 51 (charge / emergency lighting control circuit) controls charge / discharge of the storage battery 52. When electric power is supplied from the external power supply 90, the charge / discharge control circuit 51 electrically connects the storage battery 52 to the output of the charge power supply circuit 34 to charge the storage battery 52. The charge / discharge control circuit 51 controls the current for charging the storage battery 52 in accordance with the characteristics of the storage battery 52. When the power supply from the external power supply 90 is stopped, the charge / discharge control circuit 51 electrically connects the storage battery 52 to the input of the DC / DC conversion circuit 36 and discharges the storage battery 52.

The charge / discharge control circuit 51 determines whether there is power supply from the external power supply 90 based on the both-end voltage of the phototransistor 244 of the power failure detection circuit 24 and the output voltage of the charge power supply circuit 34.
When electric power is supplied from the external power supply 90, the voltage across the phototransistor 244 is almost zero because the phototransistor 244 is on.
When the power supply from the external power supply 90 is stopped, the phototransistor 244 is turned off, and the voltage across the phototransistor 244 becomes substantially equal to the voltage across the smoothing capacitor 427. Therefore, the charge / discharge control circuit 51 determines that a power failure has started when the voltage across the phototransistor 244 becomes higher than a predetermined threshold voltage. Thereafter, when the smoothing capacitor 427 is discharged, the voltage across the phototransistor 244 decreases, but the charging / discharging control circuit 51 has stopped operating because the output voltage of the charging power circuit 34 is low. It is determined that the power outage continues.
When power supply from the external power supply 90 resumes, the charging power supply circuit 34 resumes operation, and the voltage across the smoothing capacitor 427 increases. Further, since the phototransistor 244 is turned on, the voltage across the phototransistor 244 remains low. Therefore, the charge / discharge control circuit 51 is supplied with power from the external power supply 90 when the voltage across the phototransistor 244 is lower than a predetermined threshold voltage and the output voltage of the charging power supply circuit 34 is higher than the predetermined threshold voltage. It is determined that
In this way, by determining whether there is power supply from the external power supply 90 based on the both-ends voltage of the phototransistor 244 of the power failure detection circuit 24 and the output voltage of the charging power supply circuit 34, Promptly determines the start of a power outage and starts discharging the storage battery 52. Further, when the external power supply is restored, the charging of the storage battery 52 is started after the charging power supply circuit 34 resumes its operation and waits until the output voltage becomes sufficiently high.

  The relay coil 221 of the switching circuit 22 is electrically connected to the output of the charging power supply circuit 34. When the voltage across the smoothing capacitor 427 is higher than a predetermined threshold voltage, a current flows through the relay coil 221. The switching circuit 22 electrically connects the output of the regular lighting circuit 21 to the light source circuit 11. When the voltage across the smoothing capacitor 427 is lower than a predetermined threshold voltage, no current flows through the relay coil 221. The switching circuit 22 electrically connects the output of the emergency lighting circuit 23 to the light source circuit 11.

  Note that the switching circuit 22 may be configured to switch the connection based on the determination result by the power failure detection circuit 24, or may be configured to switch the connection based on the output of the regular lighting circuit 21.

  FIG. 4 is a circuit diagram showing the configuration of the DC / DC converter circuit 36 in this embodiment.

The DC / DC converter circuit 36 includes, for example, a collector resonance type inverter circuit 61 and a rectifier circuit 63.
The collector resonance type inverter circuit 61 converts the electric power stored in the storage battery 52 into alternating current. The collector resonance type inverter circuit 61 includes, for example, a transformer 611, a resonance capacitor 616, a choke coil 617, a resistor 618, two switching elements 619 and 620, and a ballast capacitor 621.

The transformer 611 has four windings 612 to 615. The two windings 612 and 613 are electrically connected in series with each other, and are electrically connected in parallel with the resonant capacitor 616. The choke coil 617 is electrically connected between the high potential side output of the power storage circuit 35 and the connection point between the two windings 612 and 613. The resistor 618 is electrically connected between the high potential side output of the power storage circuit 35 and one end of the winding 614.
The switching elements 619 and 620 are, for example, NPN type bipolar transistors. A base terminal of the switching element 619 is electrically connected to a connection point between the winding 614 and the resistor 618. The collector terminal of the switching element 619 is electrically connected to the connection point between the winding 612 and the resonant capacitor 616. The emitter terminal of the switching element 619 is electrically connected to the low potential side of the storage battery 52. The base terminal of the switching element 620 is electrically connected to the other terminal of the winding 614. The collector terminal of the switching element 620 is electrically connected to the connection point between the winding 613 and the resonant capacitor 616. The emitter terminal of the switching element 620 is electrically connected to the low potential side of the storage battery 52.
The winding 615 and the ballast capacitor 621 are electrically connected in series with each other and electrically connected to the input of the rectifier circuit 63. The ballast capacitor 621 limits the current flowing through the winding 615.

The two windings 612 and 613 and the resonance capacitor 616 resonate and oscillate.
Since the winding 614 is electromagnetically coupled to the windings 612 and 613, a voltage proportional to the voltage generated in the windings 612 and 613 is generated at both ends of the winding 614. Thereby, of the two switching elements 619 and 620, the switching element having the lower collector terminal potential is turned on. The base current of the switching element that is turned on is supplied from the storage battery 52 via the resistor 618. Further, the collector current of the switching element that is turned on is supplied from the storage battery 52 via the choke coil 617 and the winding 612 or the winding 613. The collector current maintains the resonance between the windings 612 and 613 and the resonance capacitor 616, and the oscillation continues.

  The oscillation frequency of the collector resonance type inverter circuit 61 is preferably 20 kHz or more, for example. Thereby, the transformer 611 can be made small. This also avoids human audible range.

The rectifier circuit 63 includes, for example, a full wave rectifier circuit 631 and a smoothing capacitor 632.
The full-wave rectifier circuit 631 is, for example, a diode bridge circuit in which four rectifier diodes are bridge-connected. The full-wave rectifier circuit 631 performs full-wave rectification on the current flowing through the winding 615 by the oscillation of the collector resonance type inverter circuit 61.
The smoothing capacitor 632 is connected to the output of the full wave rectifier circuit 631. The smoothing capacitor 632 smoothes the current that is full-wave rectified by the full-wave rectifier circuit 631.

  The rectifier diode used in the full-wave rectifier circuit 631 preferably has a reverse recovery time of 1 μs or less. Thereby, power loss can be suppressed.

In this way, the electric power charged in the storage battery 52 is converted into alternating current using the collector resonance type inverter circuit 61, returned to direct current using the rectifier circuit 63, and supplied to the light source circuit 11.
Since the current flowing through the light source circuit 11 is limited by the ballast capacitor 621, there is no need for feedback control.
In addition, since it is a self-excited type that generates alternating current by the oscillation of the collector resonance type inverter circuit 61, a control circuit for turning on and off the switching element is unnecessary.
For this reason, the DC-DC converter circuit 36 can be realized with a simple configuration. Thereby, the number of parts of the common emergency lighting fixture 10 can be reduced, the manufacturing cost can be reduced, the reliability can be improved, and the power loss can be reduced.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIGS.
In addition, about the part which is common in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The overall configuration of the common emergency lighting fixture 10 in this embodiment is the same as that in the first embodiment.

  The regular lighting circuit 21 performs a constant current operation. That is, the regular lighting circuit 21 adjusts the output voltage so that the output current matches a predetermined target current. The regular lighting circuit 21 performs a protection operation when the output voltage becomes higher than a predetermined threshold value, and temporarily stops the operation. In addition, before starting the operation, the service lighting circuit 21 determines whether or not a load is connected. When it is determined that the load is not connected, the service lighting circuit 21 does not start operation and waits until the load is connected.

  FIG. 5 is a circuit diagram showing a configuration of the switching circuit 22, the charging power supply circuit 34, the storage circuit 35, and the power failure detection circuit 24 in this embodiment.

The power failure detection circuit 24 includes a delay circuit 248 in addition to the configuration described in the first embodiment.
The delay circuit 248 is interposed between the determination circuit 247 and the switching element 241. When the determination circuit 247 tries to turn on the switching element 241 from OFF, the delay circuit 248 causes a delay and waits for a predetermined time to pass before turning on the switching element 241. Conversely, when the determination circuit 247 tries to turn off the switching element 241 from the on state, the delay circuit 248 does not cause a delay and immediately turns off the switching element 241.

  FIG. 6 is a diagram illustrating an operation example of the common emergency lighting apparatus 10 according to this embodiment.

The horizontal axis indicates time. The vertical axis indicates the state, voltage, or current.
A solid line 911 indicates the state of the external power supply 90. When the solid line 911 is on the horizontal axis, it indicates that power is supplied from the external power supply 90, and when the solid line 911 is below the horizontal axis, it indicates that power is not supplied from the external power supply 90.
A solid line 912 indicates the state of the switching element 241. When the solid line 912 is on the horizontal axis, the switching element 241 is on. When the solid line 912 is below the horizontal axis, the switching element 241 is off.
A solid line 913 indicates the state of the switching element 46. When the solid line 913 is on the horizontal axis, the switching element 46 is on, and when the solid line 913 is below the horizontal axis, the switching element 46 is off.
A solid line 914 indicates the output voltage of the charging power supply circuit 34.
A solid line 915 indicates the state of the switching circuit 22. When the solid line 915 is on the horizontal axis, it represents normal operation. That is, the switching circuit 22 connects the output of the regular lighting circuit 21 and the light source circuit 11. When the solid line 915 is below the horizontal axis, it represents an emergency action. That is, the switching circuit 22 connects the output of the emergency lighting circuit 23 and the light source circuit 11.
A solid line 916 indicates the output voltage of the regular lighting circuit 21.
A solid line 917 indicates the current flowing through the light source circuit 11.

It is assumed that power supply from the external power supply 90 is stopped at time 921. The determination circuit 247 detects a power failure, and the delay circuit 248 turns off the switching element 241. As the switching power supply circuit 42 stops operating and the smoothing capacitor 427 is discharged, the output voltage of the charging power supply circuit 34 decreases.
When the output voltage of the charging power supply circuit 34 drops to a predetermined threshold voltage at time 922, the switching circuit 22 connects the output of the emergency lighting circuit 23 and the light source circuit 11.
Even if the power supply from the external power supply 90 is stopped, the service lighting circuit 21 does not stop operating immediately. Since the output of the regular lighting circuit 21 and the light source circuit 11 are disconnected by the switching circuit 22, the output current of the regular lighting circuit 21 becomes zero. The normal lighting circuit 21 increases the output voltage because the output current is smaller than the target value.

  At time 923, the output voltage of the regular lighting circuit 21 reaches the threshold value, and the regular lighting circuit 21 stops operating. As the smoothing capacitor connected to the output stage of the regular lighting circuit 21 is discharged, the output voltage of the regular lighting circuit 21 gradually decreases.

It is assumed that the power supply from the external power supply 90 is resumed at time 924. If the elapsed time from time 921 to time 924 (the time during which a power failure has occurred) is sufficiently long, the output voltage of the regular lighting circuit 21 will be lower than the normal output voltage, but as shown in this example, When the elapsed time from time 921 to time 924 is short (so-called instantaneous power failure), the output voltage of the service lighting circuit 21 may be higher than the normal output voltage.
In this state, when the switching circuit 22 connects the output of the regular lighting circuit 21 and the light source circuit 11, a high voltage is applied to the light source circuit 11, and a surge current may flow instantaneously. This may lead to a failure of the light source circuit 11 or the like and a decrease in life.

Therefore, even if the determination circuit 247 detects the recovery of the external power supply 90, the delay circuit 248 does not turn on the switching element 241.
With the restoration of the external power supply 90, the service lighting circuit 21 tries to resume operation. The regular lighting circuit 21 determines whether or not a load is connected. Since the output of the regular lighting circuit 21 and the light source circuit 11 are disconnected by the switching circuit 22, the regular lighting circuit 21 determines that the load is not connected, and waits without restarting the operation until the load is connected. To do.

At time 925, since a predetermined time has elapsed since the determination circuit 247 detected the restart of power supply from the external power supply 90, the delay circuit 248 turns on the switching element 241. As the switching power supply circuit 42 resumes operation and the smoothing capacitor 427 is charged, the output voltage of the charging power supply circuit 34 increases.
When the output voltage of the charging power supply circuit 34 reaches a predetermined threshold voltage at time 926, the switching circuit 22 connects the output of the regular lighting circuit 21 and the light source circuit 11.
At this time, the output voltage of the regular lighting circuit 21 is sufficiently low. For this reason, a surge current does not flow through the light source circuit 11.
The regular lighting circuit 21 detects that a load is connected, and resumes operation.

  Thus, at the time of recovery from a power failure, the switching circuit 22 does not immediately connect the regular lighting circuit 21 and the light source circuit 11 but waits until a predetermined time elapses before the regular lighting circuit 21 and the light source circuit 11 are connected. The light source circuit 11 is connected. Thereby, it is possible to prevent a large current from flowing through the light source circuit 11 and to prevent a failure of the light source circuit 11 and a decrease in life.

  As described above, the configuration described in each embodiment is an example, and another configuration may be used. For example, the structure which combined the structure demonstrated in different embodiment may be sufficient, and the structure which replaced the structure of the non-essential part with the other structure may be sufficient.

  DESCRIPTION OF SYMBOLS 10 Common emergency lighting fixture, 11 Light source circuit, 12 Lighting device, 21 Regular lighting circuit, 22 Switching circuit, 221 Relay coil, 222, 223 Relay switch, 224, 245, 618 Resistance, 23 Emergency lighting circuit, 24 Power failure detection Circuit, 241, 425, 46, 619, 620 Switching element, 242, 45 Photocoupler, 243, 451 LED, 244, 452 Phototransistor, 246 Drive circuit, 247 Judgment circuit, 248 Delay circuit, 34 Charging power supply circuit, 35 Power storage Circuit, 36 DC / DC conversion circuit, 41, 631 full wave rectification circuit, 42 switching power supply circuit, 420 input capacitor, 421 control circuit, 422, 611 transformer, 423 primary winding, 424 secondary winding, 426, 48 rectifier 427 Smoothing capacitor , 43 Rectifier, 47 Charging circuit, 51 Charge / discharge control circuit, 52 Storage battery, 61 Collector resonant inverter circuit, 612 to 615 winding, 616 Resonant capacitor, 617 Choke coil, 621 Ballast capacitor, 63 Rectifier circuit, 632 Smoothing capacitor , 90 External power supply, 911 to 917 Solid line, 921 to 926 Time.

Claims (2)

A conversion circuit that converts power supplied from an external power source to power supplied to the load circuit;
A storage battery,
A storage battery charging circuit for charging the storage battery with power supplied from the external power source;
A collector resonance type inverter circuit, have a rectifier circuit for rectifying the output of the collector resonance type inverter circuit, the power stored in the battery, a power converter for converting the power supplied to the load circuit,
When power is supplied from the external power supply, the output of the conversion circuit and the load circuit are electrically connected, and the power converted by the conversion circuit is supplied to the load circuit. A switching circuit that electrically connects the output of the power converter and the load circuit when power is not supplied and supplies the power converted by the power converter to the load circuit;
Have
When the power is supplied from the state in which power is not supplied from the external power source, the switching circuit performs the power conversion until a predetermined time elapses after the power supply is started. After maintaining the state in which the output of the device and the load circuit are electrically connected, after the predetermined time has elapsed, the output of the conversion circuit and the load circuit are electrically connected, and power is supplied from the external power source. A power supply device characterized in that when the power is not supplied from a state where power is supplied, the output of the power conversion device and the load circuit are immediately electrically connected. A light source circuit having a light source;
An illumination device comprising: the power source device according to claim 1 , wherein the light source circuit is used as the load circuit to supply power to the light source circuit.

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