JP2020166958A - Power supply device, guide light and emergency light - Google Patents

Abstract

To provide a power supply device capable of simplifying the constitution, and to provide a guide light and an emergency lamp equipped with the same.SOLUTION: A power supply device 12 includes: an insulation type first power conversion circuit 15; and a second power conversion circuit 17. In the first power conversion circuit 15, a commercial AC power supply e is used as an input. The second power conversion circuit 17 converts, when the commercial AC power supply e is inputted, an output from the first power conversion circuit 15 to charge a secondary battery 16 and coverts, when the commercial AC power supply e is not inputted, the output from the secondary battery 16 to supply power to a light source 13.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a power supply device that supplies power to a load by an output from a secondary battery when an external power source is not input, an guide light and an emergency light provided with the power supply device.

Conventionally, there are guide lights and emergency lights as lighting devices for displaying guidance such as evacuation passages. When an external power source such as a commercial AC power source is input to the guide light, the light source such as an LED, which is a load, is turned on by the power from the external power source, and the secondary battery is charged to shut off the external power source due to a power failure or the like. That is, in an emergency when the external power supply is not input, the light source is turned on by the electric power from the charged secondary battery. In the case of such a configuration, the circuit configuration is provided because the constant lighting circuit for constant lighting, the charging circuit for the secondary battery, and the emergency lighting circuit for emergency lighting are provided as separate configurations. Becomes complicated.

JP-A-2009-54509

An object to be solved by the present invention is to provide a power supply device capable of simplifying the configuration, and a guide light and an emergency light equipped with the power supply device.

The power supply device of the embodiment includes an isolated first power conversion circuit and a second power conversion circuit. The first power conversion circuit receives an external power supply as an input. The second power conversion circuit converts the output from the first power conversion circuit to charge the secondary battery when the external power supply is input, and converts the output from the secondary battery to supply power to the load when the external power supply is not input.

According to the present invention, the secondary power conversion circuit can charge the secondary battery when the external power source is input and supply power to the load when the external power source is not input, so that the configuration can be expected to be simplified.

It is a circuit diagram which shows the operation at the time of input of the external power source of the guide light provided with the power source device of 1st Embodiment. It is a circuit diagram which shows the operation when the external power source of the guide light is not input. It is a circuit diagram which shows the operation when the external power source of the emergency light provided with the power source device of 2nd Embodiment is input and is not input.

Hereinafter, one embodiment will be described with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a lighting device. In the lighting device 11, a light source module 14 which is a load module including a light source 13 which is a load can be attached to and detached from the power supply device 12. As the light source 13, a light bulb, a light emitting element, or the like can be used, but in the present embodiment, for example, an LED as a light emitting element which is a solid light source is used, and for example, these light sources 13 are connected in series. As the light source 13, an organic EL element, an inorganic EL element, or the like may be used instead of the LED.

The power supply device 12 includes a first power conversion circuit 15, a storage battery as a backup power source, that is, a secondary battery (battery) 16, and a second power conversion circuit 17. The secondary battery 16 is a rechargeable battery pack in which a plurality of DC power sources are connected in series, and keeps the light source 13 lit with a predetermined luminous flux for a predetermined time or longer when the commercial AC power source e, which is an external power source, is cut off. It has a capacity that can be used. As the secondary battery 16, for example, a nickel hydrogen battery or the like is used. Although it is shown in FIGS. 1 and 2 as having two cells, the present invention is not limited to this, and it may have one or three or more cells.

The lighting device 11 is a guide light in the present embodiment. That is, in the lighting device 11, the power supply device 12 uses the commercial AC power source e as a power source and converts the voltage from the commercial AC power source e by the first power conversion circuit 15 at all times when the commercial AC power source e is input. It is supplied to 13 to turn on the light source 13, and the output from the first power conversion circuit 15 is converted by the second power conversion circuit 17 to charge the secondary battery 16, which is an emergency when the commercial AC power supply e is not input. At the time of time or power failure (when cut off), the output from the secondary battery 16 is converted by the secondary power conversion circuit 17 and supplied to the light source 13 to light the light source 13 by using the secondary battery 16 as a power source. It accurately informs the position of the evacuation port and the evacuation direction and provides guidance. The lighting device 11 is installed on an installation surface such as a ceiling surface or a vertical wall surface, or is embedded in a floor surface.

The first power conversion circuit 15 has a commercial AC power supply e as an input side. In the present embodiment, the first power conversion circuit 15 inputs a voltage obtained by rectifying the commercial AC power supply e. When the commercial AC power supply e is input, the first power conversion circuit 15 controls the input AC voltage with constant current control, constant voltage control, or constant power control. The first power conversion circuit 15 includes a noise prevention circuit 21 which is a filter circuit for removing noise from the commercial AC power supply e side, and a first rectifying means 22 which is a rectifying means for rectifying an AC voltage from the commercial AC power supply e. , The first smoothing means 23, which is a smoothing means for smoothing the output of the first rectifying means 22, is electrically connected to the commercial AC power supply e via the first smoothing means 23. That is, a DC voltage is input to the first power conversion circuit 15. Although not shown, the noise prevention circuit 21 includes, for example, a varistor and a capacitor connected between power supply lines, a common mode choke, and the like. The first rectifying means 22 is connected to the output side of the noise prevention circuit 21. As the first rectifying means 22, a full-wave rectifying means such as a diode bridge is used. The first smoothing means 23 is connected to the output side of the first rectifying means 22. As the first smoothing means 23, a smoothing element such as an electrolytic capacitor is used.

Further, the first power conversion circuit 15 insulates the secondary battery 16 side from the commercial AC power supply e side. Since the lighting device 11 charges the secondary battery 16, it is preferable that the first power conversion circuit 15 is insulated from the commercial AC power source e in consideration of safety. In this embodiment, the first power conversion circuit 15 is an isolated flyback converter. The first power conversion circuit 15 includes a switching transformer 25, a switch means 26 is connected to the primary side of the switching transformer 25, and a second rectifying means 27 which is a rectifying means and a smoothing means are used on the secondary side of the switching transformer 25. Is connected to a second smoothing means 28. The primary side of the switching transformer 25 is connected to the output side of the first smoothing means 23, and the secondary side set to a predetermined turns ratio with respect to the primary side is connected to the second power conversion circuit 17 as the output side. In the present embodiment, the switching transformer 25 causes the first power conversion circuit 15 to step down the received voltage and output it. For the switch means 26, for example, an IPD circuit or the like is used. As the second rectifying means 27, a half-wave rectifying means such as a diode is used. Further, as the second smoothing means 28, a smoothing element such as an electrolytic capacitor is used.

In the present embodiment, the light source module 14 and the second power conversion circuit 17 are connected to the output side of the first power conversion circuit 15. That is, the first power conversion circuit 15 of the present embodiment acts as a constant lighting circuit that supplies power to the light source 13 at all times when the commercial AC power source e is input and lights the light source 13. On the low-voltage side of the light source module 14, there is a series circuit of the first switch 31 which is a switching means and the first current detection resistor 32 which is a current detecting means, and the second switch 33 which is a switching means and the current detecting means. A series circuit with the two-current detection resistor 34 is connected in parallel. The first switch 31 is turned on when the commercial AC power supply e is input, and the second switch 33 is turned on when the commercial AC power supply e is not input, that is, when the secondary battery 16 is discharged. That is, the first switch 31 and the second switch 33 constitute a selection means that can be selectively switched according to the input and non-input of the commercial AC power supply e. The connection point between the first switch 31 and the first current detection resistor 32 is connected to the first control unit 35, which is the control unit of the first power conversion circuit 15, in an insulated state. The first control unit 35 controls the switching of the switch means 26 according to the current flowing through the light source 13 detected by the first current detection resistor 32. The first control unit 35 is connected to the secondary side of the switching transformer 25 by using a photocoupler or the like, in a state of being insulated from the connection point between the first switch 31 and the first current detection resistor 32 in this embodiment. To.

The second power conversion circuit 17 acts as a charging circuit for charging the secondary battery 16 by using the output of the first power conversion circuit 15 as an input at all times when the commercial AC power source e is input. Further, the second power conversion circuit 17 acts as an emergency lighting circuit that feeds the light source 13 with the output from the secondary battery 16 as an input in an emergency when the commercial AC power source e is not input.

In the present embodiment, the second power conversion circuit 17 is a synchronous rectification type power conversion circuit. Further, the second power conversion circuit 17 is a switching circuit including a pair of switching elements. In the present embodiment, the second power conversion circuit 17 includes a first switching element 41 and a second switching element 42 connected in series to the output side of the first power conversion circuit 15. That is, the second power conversion circuit 17 is a half-bridge type inverter circuit. Further, an output capacitor 44 is connected in parallel with the second switching element 42 via an inductor 43, and a secondary battery 16 and a third current detection resistor 45, which is a current detecting means, are connected to the output side of the output capacitor 44. A series circuit is connected.

As the switching elements 41 and 42, for example, N-ch MOSFETs are preferably used. These switching elements 41 and 42 are switched by the second control unit 46, which is the control unit of the second power conversion circuit 17. The second control unit 46 is connected to the connection point between the second switch 33 and the second current detection resistor 34, and the connection point between the secondary battery 16 and the third current detection resistor 45. When the commercial AC power supply e is input, the second control unit 46 controls at least the switching of the first switching element 41 according to the charging current of the secondary battery 16 detected by the third current detection resistor 45. Further, the second control unit 46 controls switching of at least the second switching element 42 according to the current flowing through the light source 13 detected by the second current detection resistor 34 when the commercial AC power supply e is not input.

Then, the above-mentioned lighting device 11 is the first switch in the power supply device 12 when the commercial AC power supply e shown in FIG. 1 is input, that is, at all times, in other words, when the lighting device 11 is operated by the commercial AC power supply e. 31 is turned on, the second switch 33 is turned off, and in the first power conversion circuit 15, the first control unit 35 detects the current flowing through the light source module 14, that is, the light source 13 via the first current detection resistor 32. The switching means 26 is switched so that the current flowing through the light source 13 becomes constant. In this way, by keeping the current of the light source 13 constant, the output voltage V1 of the first power conversion circuit 15 is controlled to be substantially constant with the light source 13 and the forward voltage Vf of the LED in this embodiment. (1) The power conversion circuit 15 acts as a constant voltage source. That is, in the present embodiment, the output voltage V1 of the first power conversion circuit 15 is set to be substantially equal to the forward voltage (voltage drop) Vf of the light source 13 (V1≈Vf). The forward voltage Vf is a voltage obtained by adding the forward voltages of the individual light sources 13. Further, in the second power conversion circuit 17, the second control unit 46 detects the charging current of the secondary battery 16 via the third current detection resistor 45, and the charging current is constant on the high potential side. The first switching element 41 is switched according to the charging current. The second switching element 42 on the low potential side is switched by setting the on period synchronously with the first switching element 41 on the high potential side by the second control unit 46, or the flywheel operation by the parasitic diode component is performed. To do. The current flow when the first switching element 41 is on is indicated by an arrow I1, and the current flow when the first switching element 41 is off is indicated by an arrow I2. As a result, the second power conversion circuit 17 acts as a step-down chopper circuit. That is, in the present embodiment, the output voltage V1 of the first power conversion circuit 15 is set to be larger than the voltage V2 of the secondary battery 16 (V1> V2). At this time, by controlling the target value of the charging current in the second control unit 46, the charging current can be changed without using additional switch parts or the like. That is, compared with the conventional example in which the charging current of the secondary battery 16 is changed by counting the time from the start of charging by switching the current limiting resistance of the secondary battery 16 using a transistor switch or the like, the configuration is simpler. The charging current of the next battery 16 can be changed.

On the other hand, when the commercial AC power supply e shown in FIG. 2 is not input, that is, in an emergency, in other words, in the event of a power failure, the first power conversion circuit 15 does not operate in the power supply device 12. Further, the first switch 31 is turned off and the second switch 33 is turned on, and in the second power conversion circuit 17, the second control unit 46 flows to the light source module 14, that is, the light source 13 via the second current detection resistor 34. The current is detected, and the second switching element 42 on the low potential side is switched so that this current becomes constant. The first switching element 41 on the high potential side is switched by the second control unit 46 in synchronization with the second switching element 42 on the low potential side, or the voltage of the secondary battery 16 is applied by using only the diode component. , Boosts to the voltage at which the light source 13 lights up. The current flow when the second switching element 42 is on is indicated by an arrow I3, and the current flow when the second switching element 42 is off is indicated by an arrow I4. As a result, the second power conversion circuit 17 acts as a boost chopper circuit. That is, in the present embodiment, the voltage V2 of the secondary battery 16 is set to be smaller than the forward voltage Vf of the light source 13 (Vf> V2).

As described above, according to the first embodiment, the secondary power conversion circuit 17 is used to establish the boosting operation by charging and discharging the secondary battery 16, and the second power conversion circuit 17 is used to establish a commercial AC power supply. Since the secondary battery 16 can be charged when e is input and the light source 13 can be turned on when the commercial AC power source e is not input, the configuration of the power supply device 12 can be simplified. Therefore, it is possible to provide a small and inexpensive power supply device 12. In particular, when the lighting device 11 is a guide light, for example, a circuit that lights the light source 13 when the commercial AC power supply e is input, a circuit that charges the secondary battery 16 when the commercial AC power supply e is input, and a commercial AC power supply. The configuration can be simplified and effective as compared with the conventional configuration including the circuit for turning on the light source 13 when the e is not input.

In the present embodiment, the power supply device 12 has a primary power so that the output voltage V1 of the first power conversion circuit 15 is substantially equal to the forward voltage Vf of the light source 13 and is larger than the voltage V2 of the secondary battery 16. By controlling the conversion circuit 15 by the first control unit 35, it can be suitably used as a guide light that lights the light source 13 at the time of input and the time of non-input of the commercial AC power supply e.

Next, the second embodiment will be described with reference to FIG. The same components and operations as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the present embodiment, the lighting device 11 is an emergency light. That is, the lighting device 11 of the present embodiment charges the secondary battery 16 in the power supply device 12 when the commercial AC power supply e is input, and uses the power of the secondary battery 16 when the commercial AC power supply e is not input. Turn on the light source 13. In FIG. 3, the circuit on the input side of the first power conversion circuit 15 includes a noise prevention circuit 21, a first rectifying means 22, and a first smoothing means 23 as in the first embodiment. Therefore, the illustration is omitted for the sake of clarity.

Unlike the first embodiment, the lighting device 11 does not light the light source 13 when the commercial AC power supply e is input. Therefore, in the power supply device 12, the first control unit 35 is located on the output side of the first power conversion circuit 15. In order to feedback control the output voltage of the first power conversion circuit 15, a detection circuit that feeds back the electrical characteristics of the secondary side of the switching transformer 25, in this embodiment, detects the output voltage V1 of the first power conversion circuit 15. A series circuit of voltage dividing resistors 51 and 52, which are voltage dividing means as voltage detecting means, is connected in parallel with the light source module 14, that is, the light source 13. The midpoints of the voltage dividing resistors 51 and 52 are connected to the first control unit 35. Further, a current detection resistor 54, which is a current detection means for the second control unit 46 to detect the current flowing through the light source 13, is connected to the light source module 14, that is, the low voltage side of the light source 13, and the current detection resistor 54 The connection point with the light source 13 is connected to the second control unit 46.

Then, the above-mentioned lighting device 11 is the first control unit in the first power conversion circuit 15 when the commercial AC power supply e is input, that is, at all times, in other words, when the lighting device 11 is operated by the commercial AC power supply e. 35 detects the output voltage V1 via the voltage dividing resistors 51 and 52, and switches the switching means 26 so that this output voltage V1 becomes the target voltage. At this time, by controlling the output voltage V1 to be smaller than the forward voltage Vf of the light source 13 (Vf> V1), the light source 13 does not turn on and remains in the extinguished state. Since the operation of the second power conversion circuit 17 is the same as that of the first embodiment, the description thereof will be omitted.

On the other hand, the first power conversion circuit 15 does not operate when the commercial AC power supply e is not input, that is, in an emergency, in other words, in the event of a power failure. Further, in the second power conversion circuit 17, the second control unit 46 detects the current flowing through the light source module 14, that is, the light source 13 via the current detection resistor 54, and the low potential side so that this current becomes constant. The second switching element 42 is switched. The first switching element 41 on the high potential side is switched by the second control unit 46 in synchronization with the second switching element 42 on the low potential side, or the voltage of the secondary battery 16 is applied by using only the diode component. , Boosts to the voltage at which the light source 13 lights up. As a result, the second power conversion circuit 17 acts as a boost chopper circuit.

As described above, according to the second embodiment, as in the first embodiment, the second power conversion circuit 17 is used to establish the charging and discharging of the secondary battery 16 to boost the pressure. Since the power conversion circuit 17 can charge the secondary battery 16 when the commercial AC power supply e is input and turn on the light source 13 when the commercial AC power supply e is not input, the configuration can be simplified and the lighting device 11 can be extremely used. It can be used as a light.

In the present embodiment, in the power supply device 12, the first power conversion circuit 15 is provided so that the output voltage V1 of the first power conversion circuit 15 is smaller than the forward voltage Vf and larger than the voltage V2 of the secondary battery 16. Is controlled by the first control unit 35, so that it can be suitably used as an emergency light that lights the light source 13 only when the commercial AC power supply e is not input.

In each of the above embodiments, the external power supply is a commercial AC power supply e, but it may also be a DC power supply having, for example, a commercial AC power supply e, a noise prevention circuit 21, a first rectifying means 22, and a first smoothing means 23. Good.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

12 Power supply
13 Light source that is a load
15 First power conversion circuit
16 Rechargeable battery
17 Second power conversion circuit e Commercial AC power supply that is an external power supply

Claims (5)

With an isolated first power conversion circuit that uses an external power supply as an input;
When the external power supply is input, the output from the primary power conversion circuit is converted to charge the secondary battery, and when the external power supply is not input, the output from the secondary battery is converted to supply power to the load. With the circuit;
A power supply device characterized by comprising. The first power conversion circuit controls one of constant current control, constant voltage control, and constant power control for a light source which is a load at the time of input of the external power supply.
The second power conversion circuit is a synchronous rectification type, and when the external power supply is input, the voltage obtained from the first power conversion circuit is stepped down to charge the secondary battery, and when the external power supply is not input, the secondary battery is charged. The power supply device according to claim 1, wherein the voltage obtained from the secondary battery is boosted and controlled to be supplied to a light source which is a load. The first power conversion circuit outputs a voltage lower than the lighting voltage of the light source, which is a load, and outputs a voltage lower than the lighting voltage of the light source.
The second power conversion circuit is a synchronous rectification type, and when the external power supply is input, the voltage obtained from the first power conversion circuit is stepped down to charge the secondary battery, and when the external power supply is not input, the secondary battery is charged. The power supply device according to claim 1, wherein the voltage obtained from the secondary battery is boosted and controlled to be supplied to a light source which is a load. With the power supply device according to claim 1 or 2.
With a light source that is a load;
A guide light characterized by being equipped with. With the power supply device according to claim 1 or 3.
With a light source that is a load;
An emergency light characterized by being equipped with.

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