JP2020119742A - Electric power unit and lighting fixture - Google Patents

Abstract

To aim for dual use of common circuit structure.SOLUTION: An electric power unit 1 includes a DC power supply circuit 10 for outputting DC voltages from a first output terminal 101 and a second output terminal 102. The electric power unit 1 includes a first load terminal T1 electrically connected with the first output terminal 101 and electrically connected with the first end of a light source 2, and a second load terminal T2 electrically connected with the second end of the light source 2. The electric power unit 1 includes a first current adjustment circuit 11 for adjusting a first load current IL1 flowing from the first load terminal T1 to the second load terminal T2, a third load terminal T3, and a second current adjustment circuit 12 for adjusting a second load current IL2 flowing from the first load terminal T1 to the third load terminal T3. The electric power unit 1 includes a changeover section 13 for alternatively changing a first state where the second load terminal T2 and the third load terminal T3 are conducted electrically, and a second state where the second load terminal T2 and the third load terminal T3 are not conducted electrically.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a power supply device and a lighting fixture, and more particularly, to a power supply device that supplies a constant current to a load, and a lighting fixture including a light source corresponding to the power supply device and the load.

As a conventional example of a power supply device, a lighting device described in Patent Document 1 will be illustrated. The lighting device described in Patent Document 1 (hereinafter referred to as Conventional Example 1) includes a constant current circuit. The constant current circuit supplies a constant current to a light source unit including a first light source having a first light color and a second light source having a second light color. A series circuit of the first light source and the first switch and a series circuit of the second light source and the second switch are connected in parallel with each other between the output terminals of the constant current circuit. Furthermore, the connection point between the first light source and the first switch and the connection point between the second light source and the second switch are electrically connected via a resistance element. Conventional example 1 further includes a control unit that individually turns on and off the first switch and the second switch. The control unit switches between a first conductive state in which the first switch is conductive and a second conductive state in which the second switch is conductive. In the first conductive state, the second light source lights up with a light amount smaller than the light amount that lights up in the second conductive state. In the second conductive state, the first light source lights up with a light amount smaller than the light amount that lights up in the first conductive state.

As another conventional example, an LED drive described in Patent Document 2 will be illustrated. An LED drive described in Patent Document 2 (hereinafter referred to as Conventional Example 2) is a rectifier that rectifies an AC input, a power factor correction circuit that converts a pulsating current output of the rectifier into a DC, and an LED (Light Emitting Diode) that is a load. ) And a current drive circuit for supplying a current to the device. The current drive circuit has two high electron mobility transistors. The drains of each of these two high electron mobility transistors are connected in parallel to the cathode of the LED. Therefore, the current flowing through the LED is divided into the two high electron mobility transistors, so that the allowable power of each high electron mobility transistor can be reduced. Therefore, the LED drive (power supply device) of Conventional Example 2 can suppress the temperature rise of the current drive circuit.

JP, 2016-181483, A JP, 2016-164983, A

By the way, the power supply device (lighting device) of Conventional Example 1 and the power supply device (LED driver) of Conventional Example 2 have the same basic circuit configuration except that the numbers of loads (light source units and LEDs) are different. There is. Therefore, it is desired that a plurality of types of power supply devices (for example, the lighting device of Conventional Example 1 and the LED driver of Conventional Example 2) share a common circuit configuration.

An object of the present disclosure is to provide a power supply device and a lighting fixture that can achieve common use of a common circuit configuration.

A power supply device according to an aspect of the present disclosure includes a DC power supply circuit that has a first output terminal and a second output terminal, and outputs a DC voltage from the first output terminal and the second output terminal. The power supply device is electrically connected to the first output terminal and is also electrically connected to a second end of the load, and a first load terminal electrically connected to a first end of the load. A second load terminal. The power supply device includes a first current adjusting circuit that adjusts a first load current flowing from the first load terminal to the second load terminal, a third load terminal, and the first load terminal to the third load terminal. And a second current adjusting circuit for adjusting the flowing second load current. The power supply device selectively has a first state in which the second load terminal and the third load terminal are electrically connected and a second state in which the second load terminal and the third load terminal are not electrically connected. And a switching unit for switching to.

A lighting fixture according to an aspect of the present disclosure includes the power supply device and a fixture main body that supports a light source corresponding to the load.

The power supply device and the lighting fixture of the present disclosure have an effect that a common circuit configuration can be shared.

FIG. 1 is a circuit configuration diagram when the switching unit is switched to the second state in the power supply device according to the embodiment of the present disclosure. FIG. 2 is a plan view of a switching unit in the above power supply device. FIG. 3 is a circuit configuration diagram when the switching unit is switched to the first state in the above power supply device. FIG. 4A is a cross-sectional view of a lighting fixture according to an embodiment of the present disclosure. FIG. 4B is a cross-sectional view of a lighting fixture according to another embodiment of the present disclosure.

A power supply device and a lighting fixture according to an embodiment of the present disclosure will be described in detail with reference to the drawings. However, the drawings described in the following embodiments are schematic drawings, and the respective ratios of the sizes and the thicknesses of the respective constituent elements do not necessarily reflect the actual dimensional ratios. The configurations described in the embodiments below are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as the effects of the present disclosure can be exhibited.

As shown in FIG. 1, a power supply device 1 (hereinafter, abbreviated as power supply device 1) according to the embodiment converts AC power supplied from a commercial power supply 9 into DC power and supplies the DC power to a load. The load in the embodiment is the light source 2 having the LED module (first LED module 21 or the first LED module 21 and the second LED module 22) configured by a plurality of LEDs. However, the load may be a load other than the light source. The light source 2 is not limited to the LED module, and may be a solid-state light source such as an organic electroluminescence element or a semiconductor laser element.

The first LED module 21 outputs, for example, daylight-colored light (visible light having a correlated color temperature in the range of 5700K to 7100K). The second LED module 22 outputs, for example, light of a bulb color (visible light having a correlated color temperature in the range of 2600K to 3250K).

The power supply device 1 includes a DC power supply circuit 10, a first current adjustment circuit 11, a second current adjustment circuit 12, a switching unit 13, and a control circuit 14 (see FIG. 1 ).

The DC power supply circuit 10 includes a rectifier 103, a DC/DC converter 104, and a converter control circuit 105. The DC power supply circuit 10 outputs a DC current from the first output terminal 101 and the second output terminal 102.

The rectifier 103 is a diode bridge circuit, and full-wave rectifies the AC voltage input from the commercial power supply 9. The rectifier 103 outputs a pulsating voltage from between the pulsating current output terminals on the high potential side and the low potential side.

The DC/DC converter 104 is a step-up/down chopper circuit including a SEPIC (Single Ended Primary Inductor Converter) circuit. However, the DC/DC converter 104 may be a step-up/down chopper circuit other than the SEPIC circuit, or may be a step-up chopper circuit or a step-down chopper circuit.

The DC/DC converter 104 includes a switching element Q3, a first inductor L1, a second inductor L2, a capacitor C1, a diode D1 and a smoothing capacitor C0. However, the first inductor L1 and the second inductor L2 may be wound around the same iron core, or may be wound around different iron cores. The first end (winding start) of the first inductor L1 is electrically connected to the pulsating current output end on the high potential side of the rectifier 103, and the second end of the first inductor L1 is electrically connected to the first end of the capacitor C1. It is connected. The second end of the capacitor C1 is electrically connected to the anode of the diode D1 and the second end of the second inductor L2. The cathode of the diode D1 is electrically connected to the positive electrode of the smoothing capacitor C0. The negative electrode of the smoothing capacitor C0 and the first end (start of winding) of the second inductor L2 are electrically connected to the low potential side pulsating flow output end of the rectifier 103. The switching element Q3 is an enhancement type N-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor). The drain of the switching element Q3 is electrically connected to the second end of the first inductor L1 and the first end of the capacitor C1. The source of the switching element Q3 is electrically connected to the low potential side pulsating current output terminal of the rectifier 103, the first terminal of the second inductor L2, and the negative electrode of the smoothing capacitor C0. The positive electrode of the smoothing capacitor C0 is electrically connected to the first output terminal 101, and the negative electrode of the smoothing capacitor C0 is electrically connected to the second output terminal 102.

The converter control circuit 105 switches the switching element Q3 by applying a drive voltage between the gate and the source of the switching element Q3. Converter control circuit 105 matches the output voltage of DC/DC converter 104 with the target voltage by adjusting the duty ratio of switching element Q3. The target voltage of the output voltage is higher than the lighting start voltage of the light source 2, that is, the higher lighting start voltage of the lighting start voltage of the first LED module 21 and the second LED module 22. ..

The first output terminal 101 of the DC power supply circuit 10 is electrically connected to the first load terminal T1. The first load terminal T1 is electrically connected to the positive electrode of the first LED module 21 and the positive electrode of the second LED module 22. The negative electrode of the first LED module 21 is electrically connected to the second load terminal T2 of the power supply device 1. The negative electrode of the second LED module 22 is electrically connected to the third load terminal T3 of the power supply device 1. That is, the first LED module 21 is electrically connected in series to the first load terminal T1 and the second load terminal T2. The second LED module 22 is electrically connected in series to the first load terminal T1 and the third load terminal T3. Here, the load current flowing from the first load terminal T1 to the second load terminal T2 via the first LED module 21 is referred to as a first load current IL1, and the load current flowing from the first load terminal T1 to the second LED module 22 via the second LED module 22. The load current flowing through the third load terminal T3 is referred to as a second load current IL2.

The first current adjusting circuit 11 is controlled by the control circuit 14 to adjust the first load current IL1. The first current adjusting circuit 11 is provided between the second output terminal 102 and the second load terminal T2 of the DC power supply circuit 10. The first current adjustment circuit 11 has a first semiconductor element Q1 and a resistor R1. The first semiconductor element Q1 is an enhancement type N-channel MOSFET. The drain of the first semiconductor element Q1 is electrically connected to the second load terminal T2. The source of the first semiconductor element Q1 is electrically connected to the first end of the resistor R1. The second end of the resistor R1 is electrically connected to the second output terminal 102.

The second current adjusting circuit 12 is controlled by the control circuit 14 to adjust the second load current IL2. The second current adjustment circuit 12 is provided between the second output terminal 102 and the third load terminal T3 of the DC power supply circuit 10. The second current adjustment circuit 12 has a second semiconductor element Q2 and a resistor R2. The second semiconductor element Q2 is an enhancement type N-channel MOSFET. The drain of the second semiconductor element Q2 is electrically connected to the third load terminal T3. The source of the second semiconductor element Q2 is electrically connected to the first end of the resistor R2. The second end of the resistor R2 is electrically connected to the second output terminal 102.

The control circuit 14 detects the first load current IL1 based on the voltage across the resistor R1 and detects the second load current IL2 based on the voltage across the resistor R2. The control circuit 14 adjusts the gate-source voltage of each of the first semiconductor element Q1 and the second semiconductor element Q2. The control circuit 14 adjusts the gate-source voltage of the first semiconductor element Q1 so that the detected value of the first load current IL1 matches the target value of the first load current IL1. Further, the control circuit 14 adjusts the gate-source voltage of the second semiconductor element Q2 so that the detected value of the second load current IL2 matches the target value of the second load current IL2.

The control circuit 14 sets a target for the first load current IL1 according to a dimming level and a toning level (color temperature) instructed by a control device (for example, a remote controller such as a dimmer) outside the power supply device 1. It is preferable to determine the value and the target value of the second load current IL2. For example, the control circuit 14 determines the ratio between the target value of the first load current IL1 and the target value of the second load current IL2 according to the toning level, and also determines each target value according to the dimming level. To do.

The switching unit 13 selectively has a first state in which the second load terminal T2 and the third load terminal T3 are electrically connected and a second state in which the second load terminal T2 and the third load terminal T3 are not electrically connected. Switch to. As shown in FIG. 1, the switching unit 13 in this embodiment has a first land 131 and a second land 132. The first land 131 is electrically connected to the second load terminal T2. The second land 132 is electrically connected to the third load terminal T3. The switching unit 13 in the present embodiment is switched to the second state and does not electrically connect the first land 131 and the second land 132.

The first land 131 and the second land 132 are formed on the printed wiring board 15, as shown in FIG. On the printed wiring board 15, a plurality of electronic components forming the DC power supply circuit 10, the first current adjusting circuit 11, the second current adjusting circuit 12, and the control circuit 14 are mounted. The plurality of electronic components are electrically connected by a conductor for printed wiring formed on one side or both sides of the printed wiring board 15. The first land 131 and the second land 132 are also electrically connected to the conductor 150 for printed wiring (see FIG. 2). The first land 131 and the second land 132 can be electrically connected via the conductor 133. The conductor 133 is preferably formed of a metal material such as copper or a copper alloy to have a uniform thickness. However, the conductor 133 is made of an electrically insulating material such as synthetic resin except for the end portions on both sides inserted into the through holes 151 and 152 located at the centers of the first land 131 and the second land 132, respectively. It is preferably covered with an insulator 134 (see FIG. 2).

Then, both ends of the conductor 133 are inserted into the through holes 151 and 152 one by one, and are soldered to the first land 131 and the second land 132 one by one, so that the first land 131 and the first land 131 are connected. The second land 132 is electrically connected via the conductor 133. That is, the switching unit 13 switches to the first state by electrically connecting the first land 131 and the second land 132 with the conductor 133.

FIG. 3 shows an example of the circuit configuration of the power supply device 1 when the switching unit 13 is switched to the first state. When the switching unit 13 is switched to the first state, that is, when the first land 131 and the second land 132 are conducting, the second load terminal T2 and the third load terminal T3 are electrically connected via the switching unit 13. Will be connected to. In this case, it is preferable that the light source 2 (first LED module 21) is electrically connected to the first load terminal T1 and the second load terminal T2. Therefore, the first load current IL1 flowing through the first LED module 21 passes through the load current flowing from the second load terminal T2 to the first current adjusting circuit 11 and the second load terminal T2 through the switching unit 13 and the third load terminal T3. And divided into the load current flowing through the second current adjusting circuit 12. That is, by dividing the first load current IL1 into the two semiconductor elements (first semiconductor element Q1 and second semiconductor element Q2), the rated power required for each semiconductor element can be reduced. Then, by reducing the rated power of each semiconductor element, it is possible to reduce the heat generated in each semiconductor element (first semiconductor element Q1 and second semiconductor element Q2).

Therefore, the power supply device 1 selectively switches between two types of circuit configurations (the circuit configuration shown in FIG. 1 and the circuit configuration shown in FIG. 3) by switching the switching unit 13 between the first state and the second state. Can be realized. That is, the power supply device 1 can be made to have a common circuit configuration (the DC power supply circuit 10, the first current adjusting circuit 11, the second current adjusting circuit 12, and the control circuit 14). The operation of switching the switching unit 13 to either the first state or the second state is preferably performed at the time of manufacturing the power supply device 1. However, the switching unit 13 may be configured with a switch having a mechanical contact such as a toggle switch.

Further, the power supply device 1 may include three or more current adjusting circuits and four or more load terminals. For example, the power supply device 1 may include a third current adjusting circuit and a fourth current adjusting circuit, and a fourth load terminal and a fifth load terminal. In this case, the third LED module is electrically connected between the first load terminal T1 and the fourth load terminal, and the fourth LED module is electrically connected between the first load terminal T1 and the fifth load terminal. Is preferred. Further, it is preferable that the switching unit 13 selectively switch between the state in which the fourth load terminal and the fifth load terminal are electrically connected and the state in which they are not electrically connected.

Next, a lighting fixture according to an embodiment of the present disclosure will be described with reference to FIGS. 4A and 4B.

The lighting fixture 6 shown in FIG. 4A is a downlight embedded in the ceiling finishing material S, and includes a fixture main body 60 having the light source 2 built-in and a power source installed on the back side (upper side) of the ceiling finishing material S. And a device 1.

The instrument main body 60 is formed of a metal material such as aluminum die cast into a bottomed cylindrical shape having an open lower surface. The light source 2 is attached to the inner bottom surface of the instrument body 60. The lower surface opening of the instrument body 60 is closed by a disc-shaped cover 61. The cover 61 is made of a translucent material such as glass or polycarbonate.

The power supply device 1 is housed in a metal case formed in a rectangular box shape. Further, the power supply device 1 is electrically connected to the light source 2 via the power supply cable 62 and the connector 63.

On the other hand, the lighting fixture 7 shown in FIG. 4B is a downlight embedded in the ceiling finishing material S, and is configured by housing the light source 2 and the power supply device 1 in the fixture body 70.

The instrument body 70 is formed of a metal material such as aluminum die cast into a bottomed cylindrical shape having an open lower surface. The internal space of the instrument main body 70 is divided into upper and lower parts by a disc-shaped partition plate 71. Further, the lower surface opening of the instrument body 70 is closed by a disc-shaped cover 72 formed of a translucent material such as glass or polycarbonate.

The light source 2 is arranged on the lower surface side of the partition plate 71. Further, the power supply device 1 is housed in the upper space of the partition plate 71. The power supply device 1 is electrically connected to the light source 2 by a power supply cable 73.

Note that the lighting fixture according to the embodiment of the present disclosure is not limited to the downlight, and may be a lighting fixture other than the downlight, such as a spotlight or a ceiling light.

As described above, the power supply device (1) according to the first aspect has the first output terminal (101) and the second output terminal (102), and the first output terminal (101) and the second output terminal (102). ), a DC power supply circuit (10) for outputting a DC voltage. A power supply device (1) according to a first aspect includes a first load terminal (which is electrically connected to a first output terminal (101) and is electrically connected to a first end of a load (light source 2) ( T1) and a second load terminal (T2) electrically connected to the second end of the load. The power supply device (1) according to the first aspect includes a first current adjustment circuit (11) that adjusts a first load current (IL1) flowing from the first load terminal (T1) to the second load terminal (T2). .. A power supply device (1) according to a first aspect adjusts a third load terminal (T3) and a second load current (IL2) flowing from the first load terminal (T1) to the third load terminal (T3). A two-current adjusting circuit (12) is provided. The power supply device (1) according to the first aspect has a first state in which the second load terminal (T2) and the third load terminal (T3) are electrically connected, a second load terminal (T2), and a third load terminal. A switching unit (13) that selectively switches the second state in which (T3) is not electrically connected is provided.

The power supply device (1) according to the first aspect selectively realizes a plurality of types (for example, two types) of circuit configurations by switching the switching unit (13) between the first state and the second state. You can That is, in the power supply device (1) according to the first aspect, the common circuit configuration (for example, the DC power supply circuit 10, the first current adjusting circuit 11, the second current adjusting circuit 12, and the control circuit 14) is shared. be able to.

The power supply device (1) according to the second aspect can be realized by a combination with the first aspect. In the power supply device (1) according to the second aspect, the switching unit (13) is formed on the printed wiring board (15) and is electrically connected to the second load terminal (T2) on the first land (131). It is preferable to have The switching part (13) preferably has a second land (132) formed on the printed wiring board (15) and electrically connected to the third load terminal (T3). The first land (131) and the second land (132) are preferably electrically connectable via a conductor (133).

The power supply device (1) according to the second aspect can realize the switching unit (13) with a simple configuration including the first land (131), the second land (132), and the conductor (133).

The power supply device (1) according to the third aspect can be realized by a combination with the first or second aspect. In the power supply device (1) according to the third aspect, the first current adjusting circuit (11) includes a first semiconductor element (Q1) inserted between the second load terminal (T2) and the second output terminal (102). ) Is preferred. The second current adjusting circuit (12) preferably has a second semiconductor element (Q2) inserted between the third load terminal (T3) and the second output terminal (102). The power supply device (1) according to the third aspect controls the first semiconductor element (Q1) and the second semiconductor element (Q2) to adjust the first load current (IL1) and the second load current (IL2). A control circuit (14) is preferably provided.

The power supply device (1) according to the third aspect supplies, for example, load currents (first load current IL1 and second load current IL2) individually to two types of loads (first LED module 21 and second LED module 22). can do.

A lighting fixture (6; 7) according to a fourth aspect supports a power supply device (1) according to any one of the first to third aspects, and a light source body (2) corresponding to a load (60; 7). 70) and.

The luminaire (6; 7) according to the fourth aspect includes the power supply device (1) according to any one of the first to third aspects, so that a common circuit configuration can be shared.

1 power supply 2 light source (load)
6 Lighting Equipment 7 Lighting Equipment 10 DC Power Supply Circuit 11 First Current Adjustment Circuit 12 Second Current Adjustment Circuit 13 Switching Section 14 Control Circuit 15 Printed Wiring Board 21 First LED Module (Load)
22 Second LED module (load)
60 appliance body 70 appliance body 101 first output terminal 102 second output terminal 131 first land 132 second land 133 conductor T1 first load terminal T2 second load terminal T3 third load terminal IL1 first load current IL2 second load Current Q1 First semiconductor element Q2 Second semiconductor element

Claims (4)

A DC power supply circuit having a first output terminal and a second output terminal, and outputting a DC voltage from the first output terminal and the second output terminal;
A first load terminal electrically connected to the first output terminal and electrically connected to a first end of the load;
A second load terminal electrically connected to the second end of the load;
A first current adjusting circuit for adjusting a first load current flowing from the first load terminal to the second load terminal;
A third load terminal,
A second current adjusting circuit for adjusting a second load current flowing from the first load terminal to the third load terminal;
A switching unit that selectively switches between a first state in which the second load terminal and the third load terminal are electrically connected and a second state in which the second load terminal and the third load terminal are not electrically connected. ,
With
Power supply. The switching unit,
A first land formed on the printed wiring board and electrically connected to the second load terminal;
A second land formed on the printed wiring board and electrically connected to the third load terminal;
Have
The first land and the second land are electrically connectable via a conductor,
The power supply device according to claim 1. The first current adjustment circuit,
A first semiconductor element inserted between the second load terminal and the second output terminal,
The second current adjustment circuit,
A second semiconductor element inserted between the third load terminal and the second output terminal,
A control circuit that controls the first semiconductor element and the second semiconductor element to adjust the first load current and the second load current,
The power supply device according to claim 1 or 2. The power supply device according to claim 1,
An instrument main body supporting a light source corresponding to the load,
With
lighting equipment.

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