JP7247558B2 - Lighting devices, luminaires and power supplies - Google Patents

Description

The present invention relates to a lighting device, a lighting fixture, and a power supply device.

Patent Literature 1 discloses a power supply device that includes a DC power supply and a boost chopper circuit. The boost chopper circuit has an inductor that stores energy and boosts the voltage of the DC power supply. This power supply device includes a current limiting element connected between a DC power supply and an inductor, and a switching element connected in parallel to the current limiting element. The switching element is turned on using the energy of the inductor of the boost chopper circuit. The inrush current after power-on is suppressed by the current limiting element. When the boost chopper circuit starts operating, the switching element is turned on and both ends of the current limiting element are short-circuited. This prevents power loss due to the current limiting element after the inrush current has finished flowing.

Japanese Patent No. 3551451

Operating power may be supplied from a lighting fixture to an external device. When operating power is supplied to an external device while the boost chopper circuit is stopped in the off mode, the configuration of Patent Document 1 does not short-circuit both ends of the current limiting element. Therefore, the current limiting element may increase power loss.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a lighting device, a lighting fixture, and a power supply device capable of reducing power consumption.

A lighting device according to the present disclosure includes a switching power supply that receives power from an external power supply and turns on and off a switching element to turn on a light source, and a protection circuit that is provided on a power supply line from the external power supply to the switching power supply. a control power supply circuit that receives power from the external power supply via the protection circuit and generates a control power supply; an external device connection unit that supplies the power of the control power supply to an external device; and a switching power supply unit. the switching power supply unit includes a first switching power supply unit that receives power from the external power supply and generates a constant voltage; and a second switching power supply unit that generates power for lighting the light source from the constant voltage. a switching power supply unit, wherein the protection circuit is connected in parallel to a current limiting element provided on the power supply line, and is electrically connected by the operation of the first switching power supply unit. and a bypass circuit, wherein the control unit preliminarily sets the power to be supplied from the external device connection unit to the external device when the first switching power supply unit and the second switching power supply unit are stopped. When the predetermined value is exceeded, the first switching power supply section is operated and the second switching power supply section is not operated .

In the lighting device according to the present invention, the switching power supply operates when the power supplied to the external device exceeds a predetermined value while the switching power supply is stopped. Therefore, when the power consumption of the external device is large, the bypass circuit becomes conductive, and the power loss due to the current limiting element can be suppressed. Therefore, power consumption can be reduced.

1 is a circuit block diagram of a lighting fixture according to Embodiment 1; FIG. 4A and 4B are diagrams for explaining the operation of the lighting fixture according to Embodiment 1; FIG. FIG. 10 is a circuit block diagram of a lighting fixture according to Embodiment 2; FIG. 10 is a diagram for explaining the operation of the lighting fixture according to Embodiment 2;

A lighting device, a lighting fixture, and a power supply device according to embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to the same or corresponding components, and repetition of description may be omitted.

Embodiment 1.
FIG. 1 is a circuit block diagram of lighting fixture 100 according to Embodiment 1. As shown in FIG. The lighting fixture 100 includes a light source section 50 having a plurality of light sources 51 and a lighting device 10 . The light source 51 is, for example, a light emitting element such as an LED. In the light source section 50, a plurality of light sources 51 are connected in series. Not limited to this, the plurality of light sources 51 may be connected in parallel or in series-parallel. Also, the light source unit 50 may have one or more light sources 51 .

The lighting device 10 is supplied with power from an external power supply AC to light the light source 51 . The external power supply AC is, for example, an AC power supply such as a commercial power supply. The lighting device 10 includes a terminal portion CN1, a rectifier DB, a switching power supply portion 30, a control portion IC1, a terminal portion CN2, and a terminal portion CN3. An external power supply AC is connected to the terminal portion CN1. The light source section 50 is connected to the terminal section CN2. A control unit 60 is connected to the terminal portion CN3.

The rectifier DB is connected to the terminal portion CN1 and rectifies the AC power of the external power supply AC. The switching power supply unit 30 receives power supply from an external power supply AC via a rectifier DB, and turns on/off the switching elements Q1 and Q2 to turn on the light source 51 . The switching power supply section 30 has a first switching power supply section 31 and a second switching power supply section 32 . The first switching power supply unit 31 receives power from an external power supply AC and generates a constant voltage. The second switching power supply section 32 generates power for lighting the light source 51 from the constant voltage generated by the first switching power supply section 31 .

The first switching power supply unit 31 boosts the pulsating voltage rectified by the rectifier DB, and charges the capacitor C1 with a predetermined DC high voltage. The first switching power supply unit 31 is, for example, a booster circuit such as a booster chopper circuit. The first switching power supply section 31 is connected to the output of the rectifier DB. The first switching power supply section 31 has a coil L1. One end of the coil L1 is electrically connected via the protection circuit 20 to the high potential side of the output of the rectifier DB. The drain of switching element Q1 and the anode of diode D1 are connected to the other end of coil L1.

The switching element Q1 is, for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). The source of switching element Q1 is connected to the low potential side of the output of rectifier DB. The gate of switching element Q1 is connected to MOSFET driver 43 . The cathode of diode D1 is connected to the positive terminal of capacitor C1.

The negative terminal of capacitor C1 is connected to the low potential side of the output of rectifier DB. A series circuit of resistors R2 and R3 is connected in parallel with the capacitor C1. A connection point between the resistors R2 and R3 is connected to the P1 terminal of the control unit IC1. The control unit IC<b>1 controls the switching power supply unit 30 . The control unit IC1 is, for example, a microcomputer.

The output voltage of the first switching power supply section 31 is charged in the capacitor C1. The voltage across the capacitor C1 is divided by the resistors R2 and R3 and input to the controller IC1. The control unit IC1 outputs a switching signal for turning on/off the switching element Q1 from the Vg1 terminal so that the voltage of the P1 terminal matches a predetermined target value.

Here, the output voltage of the microcomputer is generally smaller than the driving voltage of the MOSFET. Therefore, the switching signal from the control unit IC1 is input to the MOSFET driver 43. FIG. The MOSFET driver 43 turns on and off the switching element Q1 according to the switching signal. This makes it possible to achieve stable switching.

A second switching power supply unit 32 is connected to the capacitor C1. The second switching power supply unit 32 is, for example, a step-down circuit such as a buck converter circuit. In the second switching power supply section 32, the drain of the switching element Q2 is connected to the positive terminal of the capacitor C1. The switching element Q2 is, for example, a MOSFET. The cathode of diode D2 and one end of coil L2 are connected to the source of switching element Q2. The gate of switching element Q2 is connected to MOSFET driver 43 .

The anode of diode D2 is connected to the negative electrode of capacitor C1 and one end of resistor R4. The other end of the coil L2 is connected to the positive electrode of the capacitor C3. The other end of the resistor R4 is connected to the negative electrode of the capacitor C3. Also, the other end of the resistor R4 is input to the P3 terminal of the control unit IC1. A light source section 50 is connected in parallel with the capacitor C3 via a terminal section CN2. The output voltage of the second switching power supply section 32 is smoothed by the capacitor C3 and supplied to the light source section 50 .

The voltage applied to resistor R4 corresponds to the current flowing through light source section 50 . A current flowing through the LED is converted into a voltage by the resistor R4. The control unit IC1 detects the voltage applied to the resistor R4 from the P3 terminal. The control unit IC1 outputs a switching signal for turning on/off the switching element Q2 from the Vg2 terminal so that the voltage of the P3 terminal matches a predetermined target value. Similarly to the switching element Q1, the control unit IC1 turns on/off the switching element Q2 via the MOSFET driver 43. FIG. As a result, the light source 51 is lit under constant current control.

A control power supply circuit 41 is connected to the positive terminal of the capacitor C1. The control power supply circuit 41 receives power from the external power supply AC via the protection circuit 20 and generates the control power supply V1. The control power supply circuit 41 generates the control power supply V1 from the output voltage of the first switching power supply section 31 . The charge accumulated in the capacitor C1 is supplied from the control power supply circuit 41 to the control power supply V1. The voltage of the control power supply V1 is, for example, DC15V.

A capacitor C2 is connected between the output of the control power supply circuit 41 and the negative electrode of the capacitor C1. The voltage of the control power supply V1 is the voltage applied across the capacitor C2. A control power supply V1 is supplied to the MOSFET driver 43 . That is, the control power supply V1 supplies power for driving the switching elements Q1 and Q2.

Further, the control power supply V1 is stepped down by the step-down circuit section 42 and input to the VDD terminal of the control section IC1. The voltage input to the VDD terminal is, for example, DC5V. Thus, the control unit IC1 is supplied with power from the control power source V1.

The terminal portion CN3 has a first terminal connected to the control power supply V1 and a second terminal as a grounding terminal. The potential of the second terminal is equal to the circuit reference potential. A voltage equal to the control power supply V1 is applied between the first terminal and the second terminal. An external device is connected to the terminal portion CN3. The terminal portion CN3 is an external device connection portion that supplies the power of the control power source V1 to an external device. In this embodiment, the external device is the control unit 60 . The lighting device 10 and an external device that operates with power from the control power supply V1 constitute a power supply device 70 .

The control unit 60 operates by receiving the control power supply V1. The control unit 60 is also called a function expansion unit. The control unit 60 has, for example, a surveillance camera or various sensors. The control unit 60 has a different function than providing light by the luminaire 100 .

Next, the protection circuit 20 will be explained. The protection circuit 20 is provided on the power supply line 11 from the external power supply AC to the switching power supply section 30 . The protection circuit 20 is connected between the high potential side output terminal of the rectifier DB and the switching power supply section 30 .

The protection circuit 20 has a current limiting element R10 provided on the power supply line 11 and a bypass circuit 21 connected in parallel with the current limiting element R10. Current limiting element R10 is a resistor. One end of the current limiting element R10 is connected to the high potential side output terminal of the rectifier DB. The other end of current limiting element R10 is connected to one end of coil L1.

The bypass circuit 21 has a thyristor Q10. Thyristor Q10 has an anode connected to one end of current limiting element R10 and a cathode connected to the other end of current limiting element R10. One end of the resistor R11 and the positive electrode of the capacitor C4 are connected to the gate of the thyristor Q10. A cathode of a diode D3 is connected to the other end of the resistor R11. The anode of diode D3 is connected to the midpoint winding of coil L1. The negative terminal of capacitor C4 is connected to power supply line 11 between the cathode of thyristor Q10 and one end of coil L1. Capacitor C4 stabilizes the voltage between the gate and cathode of thyristor Q10.

When switching of the first switching power supply unit 31 starts, a potential difference is generated across the coil L1. This charges capacitor C4 via diode D3 and resistor R11. Diode D3 prevents current from flowing back from capacitor C4 to the midpoint winding of coil L1. The voltage stabilized by capacitor C4 turns on thyristor Q10. That is, the thyristor Q10 is turned on according to the power generated by turning on/off the switching element Q1. Therefore, the bypass circuit 21 becomes conductive when the first switching power supply section 31 operates.

Therefore, the path of the current output from the rectifier DB changes according to the operating state of the first switching power supply section 31 . When the first switching power supply section 31 is operating, current passes through the anode and cathode of the thyristor Q10. When the first switching power supply section 31 is not operating, current passes through the current limiting element R10.

Generally, in a low impedance state in which no charge is stored in a smoothing capacitor of a power supply circuit, a large amount of current may flow from the commercial power supply into the power supply circuit. This current is called inrush current. The inrush current may damage the switches for turning on/off the commercial power supply. For example, when a plurality of lighting fixtures are connected to one commercial power supply circuit network, the lighting fixture may be provided with a function of suppressing an inrush current that occurs when the commercial power supply is turned on.

In this embodiment, when the external power supply AC is turned on, a current flows through the current limiting element R10 until the first switching power supply section 31 operates. Therefore, the rush current can be suppressed by the current limiting element R10.

By the way, in a state where the thyristor Q10 does not exist or the thyristor Q10 is not turned on, power is supplied from the current limiting element R10 to the switching power supply section 30 and the light source section 50 . Therefore, the loss due to the current limiting element R10 increases. In contrast, in the present embodiment, power is supplied through the bypass circuit 21 when the switching power supply unit 30 is in operation. When the light source unit 50 is lit, the circuit loss can be suppressed by passing the current bypassing the current limiting element R10.

The operation of the luminaire 100 when the external power supply AC is turned on is as follows. First, current flows through the external power supply AC, the rectifier DB, the current limiting element R10, the coil L1, the diode D1, and the capacitor C1 in that order, and a voltage is stored in the capacitor C1. At this time, the rush current is suppressed by the current limiting element R10. Next, the control power supply circuit 41 operates with the voltage of the capacitor C1 to generate the control power supply V1. As a result, the control unit IC1 operates. Next, the control unit IC1 operates the first switching power supply unit 31 . Next, by switching the switching element Q1, the thyristor Q10 is turned on by the voltage obtained from the midpoint winding of the coil L1. Next, power is supplied from the external power supply AC to the first switching power supply section 31, the second switching power supply section 32, and the light source section 50 via the thyristor Q10.

In this embodiment, the thyristor Q10 is turned on after the capacitor C1 is charged. Therefore, while the capacitor C1 is not charged, the inrush current can be reliably suppressed by the current limiting element R10.

Next, consider the light-off mode of the light source unit 50, that is, the standby state. The extinguished mode indicates a state in which the light source section 50 is extinguished by an external operation such as a remote controller. A turn-off command from the outside is input to the P2 terminal of the control unit IC1. When the control unit IC<b>1 detects the extinguishing command, the control unit IC<b>1 stops the second switching power supply unit 32 to extinguish the light source unit 50 . Furthermore, when the light source 51 is turned off, the control unit IC1 stops the first switching power supply unit 31 in addition to the second switching power supply unit 32 . Thereby, circuit loss can be reduced.

Even when the light is turned off, the control power supply circuit 41 continues to operate in order to operate the control section IC1 and the control unit 60 . At this time, since the first switching power supply section 31 is stopped, the control power supply circuit 41 is supplied with current from the current limiting element R10.

In general, the more functionality extended by the control unit 60, the more power the control unit 60 consumes. When the thyristor Q10 is turned off, the current flowing from the current limiting element R10 to the control power supply circuit 41 increases as the power consumption of the control unit 60 increases. Therefore, the loss due to the current limiting element R10 increases.

On the other hand, in the present embodiment, when the power supplied from the terminal unit CN3 to the external device exceeds a predetermined value while the switching power supply unit 30 is stopped, the control unit IC1 causes the switching power supply unit 30 to to operate. Thus, when the power consumption of the control unit 60 is small, the switching power supply section 30 is stopped to suppress the standby power, and when the power consumption of the control unit 60 is large, the loss due to the current limiting element R10 can be suppressed. Therefore, the power consumption of the lighting fixture 100 can be reduced.

Further, when the power consumption of the control unit 60 exceeds a predetermined value while the first switching power supply 31 and the second switching power supply 32 are stopped, the control unit IC1 switches off the first switching power supply 31. make it work. At this time, the control unit IC1 does not operate the second switching power supply unit 32 . As a result, the thyristor Q10 can be turned on while maintaining the extinguished state.

Next, a method for detecting the power consumption of the control unit 60 will be described. The power consumption of the control unit 60 can be detected by monitoring the voltage of the capacitor C1. As the power consumption of the control unit 60 increases, the current flowing through the current limiting element R10 increases and the voltage drop across the current limiting element R10 increases. Therefore, the charging voltage of the capacitor C1 is lowered. The control unit IC1 detects the charging voltage of the capacitor C1 from the P1 terminal. The control unit IC1 activates the first switching power supply unit 31 when the voltage applied across the capacitor C1 becomes smaller than a predetermined value while the first switching power supply unit 31 is stopped. The voltage detected from the P1 terminal may be the input voltage to the control power supply circuit 41 .

Also, when the first switching power supply unit 31 is not operating, the pulsating current voltage input to the capacitor C1 increases. The control unit IC1 may operate the first switching power supply unit 31 according to the magnitude of the pulsating voltage.

2A and 2B are diagrams for explaining the operation of the lighting fixture 100 according to Embodiment 1. FIG. Before time t1, no current flows from terminal CN3. Also, the first switching power supply unit 31 is in a stopped state, and the switching element Q1 is maintained in an off state. At this time, the voltage obtained by rectifying the external power supply AC is charged in the capacitor C1. That is, the P1 terminal voltage maintains a constant value.

At time t1, the control unit 60 is connected. Alternatively, the control unit 60 may start operating at time t1. This increases the output current of the terminal portion CN3. Also, since the power is supplied from the terminal portion CN3, the voltage of the capacitor C1 begins to drop. Therefore, the P1 terminal voltage drops.

At time t2, the output current from terminal portion CN3 becomes larger than a predetermined value. At this time, the control unit IC1 detects that the voltage of the P1 terminal has decreased below the threshold Vth1. The threshold value Vth1 is stored, for example, in a storage unit included in the control unit IC1. As a result, the control unit IC1 starts switching the switching element Q1.

After time t2, the switching element Q1 is turned on and off. Since the first switching power supply unit 31 has started operating, the voltage of the capacitor C1 is boosted to a constant voltage.

With the above control, the control unit 60 can satisfy the function expansion of the lighting fixture 100 and the suppression of the standby power consumption. Therefore, it is possible to obtain a highly functional lighting fixture 100 with low power consumption and high added value.

Further, in this embodiment, the control power supply circuit 41 operates even in the extinguished mode. Therefore, appropriate control can be performed by the control unit IC1 and the control unit 60 even in the light-out mode.

As a modification of the present embodiment, when the power consumption by the current limiting element R10 becomes larger than the power consumption by the operation of the first switching power supply unit 31 when the light is turned off, the control unit IC1 controls the first switching power supply unit. 31 may be operated. Thereby, the standby power consumption of the lighting device 100 can be efficiently suppressed.

Further, in the bypass circuit 21 of the present embodiment, the thyristor Q10 is turned on by the power generated in the coil L1 as the switching element Q1 is turned on and off. The bypass circuit 21 is not limited to this, and may have another configuration as long as the bypass circuit 21 becomes conductive when the switching power supply unit 30 operates.

Further, the power supplied to the terminal portion CN3 is not limited to the control power source V1 of Embodiment 1, and any power source generated by receiving power from the external power source AC via the protection circuit 20 in the lighting device 10 can be used. good.

These modifications can be appropriately applied to lighting devices, lighting fixtures, and power supply devices according to the following embodiments. A lighting device, a lighting fixture, and a power supply device according to the following embodiments have many points in common with the first embodiment, so the explanation will focus on the points of difference from the first embodiment.

Embodiment 2.
FIG. 3 is a circuit block diagram of lighting fixture 200 according to Embodiment 2. As shown in FIG. The lighting fixture 200 includes a lighting device 210 . The lighting device 210 has a detection resistor R20. The detection resistor R20 has one end connected to the second terminal of the terminal portion CN3 and the P4 terminal of the control portion IC1, and the other end connected to the negative electrode of the capacitor C1. A current supplied to the control unit 60 from the terminal portion CN3 flows through the detection resistor R20.

A P4 terminal is a detection terminal that detects the voltage applied to the detection resistor R20. The control unit IC1 detects the voltage applied from the P4 terminal to the detection resistor R20. The control section IC1 can detect that the current flowing from the terminal section CN3 to the control unit 60 has increased from the voltage applied to the detection resistor R20. Control unit IC1 activates switching power supply unit 30 when the voltage applied to detection resistor R20 becomes greater than a predetermined value while switching power supply unit 30 is stopped. Therefore, as in the first embodiment, standby power can be suppressed when the power consumption of the control unit 60 is small, and loss due to the current limiting element R10 can be suppressed when the power consumption of the control unit 60 is large. Therefore, power consumption of the lighting fixture 200 can be reduced.

FIG. 4 is a diagram for explaining the operation of lighting fixture 200 according to the second embodiment. At time t1, the control unit 60 starts operating and the output current of the terminal CN3 increases. As a result, the current flowing through the P4 terminal increases, and the voltage at the P4 terminal increases. At time t2, the voltage of the P4 terminal becomes higher than the threshold Vth2. In response to this, the control unit IC1 starts switching the switching element Q1. Therefore, the thyristor Q10 is turned on and the loss due to the current limiting element R10 is suppressed.

In this embodiment, the voltage of the P4 terminal detected by the control unit IC1 is directly linked to the output current of the terminal unit CN3. Therefore, the power consumption of the control unit 60 can be accurately detected. In particular, in the present embodiment, even after the first switching power supply section 31 starts operating at time t2, the voltage of the P4 terminal interlocks with the output current of the terminal section CN3. Therefore, the power consumption of the control unit 60 can be detected even when the first switching power supply section 31 is operating.

After operating the first switching power supply section 31 at time t2, the control section IC1 may stop the first switching power supply section 31 when the power consumption of the control unit 60 falls below a predetermined value. As a result, when the power consumption of the control unit 60 returns to a low state, the first switching power supply section 31 is stopped again and the standby power can be suppressed.

Note that the technical features described in each embodiment may be used in combination as appropriate.

Reference Signs List 100, 200 lighting fixture 10, 210 lighting device 11 power supply line 20 protection circuit 21 bypass circuit 30 switching power supply section 31 first switching power supply section 32 second switching power supply section 41 control power supply circuit 42 Step-down circuit section 43 MOSFET driver 50 light source section 51 light source 60 control unit 70 power supply device CN1, CN2, CN3 terminal section AC external power supply DB rectifier R2, R3, R4, R11, R20 resistor R10 Current limiting element, R20 detection resistor, C1, C2, C3, C4 capacitor, L1, L2 coil, D1, D2, D3 diode, Q1, Q2 switching element, Q10 thyristor, IC1 control unit

Claims (7)

a switching power supply that receives power from an external power source and turns on and off the switching element to turn on the light source;
a protection circuit provided on a power supply line from the external power supply to the switching power supply;
a control power supply circuit that receives power from the external power supply via the protection circuit and generates a control power supply;
an external device connection unit that supplies power of the control power source to an external device;
a control unit that controls the switching power supply;
with
The switching power supply unit includes a first switching power supply unit that receives power supply from the external power supply and generates a constant voltage, and a second switching power supply unit that generates power for lighting the light source from the constant voltage. ,
The protection circuit includes a current limiting element provided on the power supply line, and a bypass circuit connected in parallel with the current limiting element and conducting when the first switching power supply unit operates,
When the power supplied from the external device connection unit to the external device exceeds a predetermined value while the first switching power source and the second switching power source are stopped, the control unit controls the A lighting device, wherein a first switching power supply unit is operated and the second switching power supply unit is not operated. The lighting device according to claim 1, wherein the control section stops the first switching power supply section and the second switching power supply section when the light source is turned off. The bypass circuit has a thyristor,
3. The lighting device according to claim 1, wherein the thyristor is turned on according to power generated by turning on and off the switching element. When the input voltage to the control power supply circuit becomes smaller than a predetermined value while the first switching power supply and the second switching power supply are stopped, the control unit controls the first switching power supply. 4. The lighting device according to any one of claims 1 to 3 , wherein the second switching power supply unit is operated while the second switching power supply unit is operated . a detection resistor connected to the external device connection portion and through which a current supplied from the external device connection portion to the external device flows;
The control unit has a detection terminal for detecting a voltage applied to the detection resistor,
When the voltage applied to the detection resistor exceeds a predetermined value while the first switching power supply unit and the second switching power supply unit are stopped, the control unit controls the first switching power supply unit. 4. The lighting device according to any one of claims 1 to 3 , wherein the second switching power supply unit is operated while the second switching power supply unit is operated . a lighting device according to any one of claims 1 to 5;
the light source;
A lighting fixture comprising: a lighting device according to any one of claims 1 to 5;
the external device that operates on power from the control power supply;
A power supply device comprising:

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