JP6920651B2 - Power supply, lighting, and control methods - Google Patents

Description

The present invention generally relates to a power supply device, a lighting device, and a control method, and more specifically, to a power supply device that supplies a predetermined DC power to a load, a lighting device provided with the power supply device, and a control method.

As a conventional example, the power supply device described in Patent Document 1 will be illustrated. This power supply device includes a regular lighting device and an emergency lighting device. The regular lighting device includes a first circuit board, on which a terminal unit, a rectifier, a switching power supply unit, a step-up chopper circuit, and a back converter circuit are mounted. Further, the emergency lighting device includes a second circuit board, and a terminal portion, an emergency power supply terminal, a charging circuit, and a lighting circuit are mounted on the second circuit board. Further, Patent Document 1 describes that the first circuit board and the second circuit board are separate boards separated from each other, and these are connected by wiring or connector via a terminal portion. ..

In Patent Document 1, by configuring the regular lighting device and the emergency lighting device with separate circuit boards, it is possible to change the circuit specifications, for example, to make the emergency lighting device different from the common regular lighting device. It is stated that it will be easier.

Japanese Unexamined Patent Publication No. 2016-207311

By the way, when the power supply device is used for a lighting device, for example, depending on the shape or size of the housing of the lighting device accommodating the power supply device, the first circuit board of the conventional lighting device of Patent Document 1 may be further divided into two circuit boards. It may be desirable to divide and arrange them. As a result, the degree of freedom in arranging the circuit board for the regular lighting device in the housing is further increased.

However, Patent Document 1 merely describes the point that the normal lighting device and the emergency lighting device are composed of separate circuit boards. If the regular lighting device described in Patent Document 1 is divided into two circuit boards at appropriate positions and these are simply electrically connected by a cable (electric wire), an abnormality such as disconnection of the cable or disconnection of the connector is abnormal. If this occurs, improper operation may occur. In addition, there is a possibility that the cable becomes an antenna and an obstacle of electromagnetic noise occurs, resulting in unstable operation.

The present invention has been made in view of the above reasons, and an object of the present invention is to provide a power supply device, a lighting device, and a control method capable of increasing the degree of freedom of arrangement while maintaining the reliability of operation.

The power supply device according to one aspect of the present invention includes a first conversion circuit, a first control circuit, a second conversion circuit, a second control circuit, a first substrate, and a second substrate. The first conversion circuit converts the input AC power into the first DC power. The first control circuit controls the first conversion circuit. The second conversion circuit converts the first DC power into a second DC power having a voltage level different from the voltage level of the first DC power and supplies the load. The second control circuit controls the second conversion circuit. Wherein the first substrate, a plurality of first circuit part constituting the first conversion circuit and the first control circuit is mounted. A plurality of second circuit components constituting the second conversion circuit and the second control circuit are mounted on the second substrate. The output end of the first conversion circuit and the input end of the second conversion circuit are electrically connected to each other. The first control circuit is electrically connected to the second control circuit and is fed from the second control circuit to control the first conversion circuit. The second control circuit is configured to monitor the input AC power. The second control circuit is configured to supply power to the first control circuit only when the AC power is input to the first conversion circuit.

The lighting device according to one aspect of the present invention includes the power supply device and a solid-state light source as the load.

A control method according to one aspect of the present invention includes converting input AC power into first DC power by a first conversion circuit in which circuit components are mounted on a first substrate. Further, in the control method, the first DC power is converted into the second DC power having a voltage level different from the voltage level of the first DC power by the second conversion circuit in which the circuit components are mounted on the second board. To supply the load. Furthermore, the control method, the second control circuit for controlling the second converter circuit are mounted the circuit components on the second substrate, monitoring the AC power input to the first conversion circuit, said the second control circuit, only when the AC power is input to the first conversion circuit, comprising the, for feeding the first control circuit for controlling the first converting circuit.

The present invention has an advantage that the degree of freedom of arrangement can be increased while maintaining the reliability of operation.

FIG. 1 is a schematic circuit block diagram of a power supply device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the lighting device according to the embodiment of the present invention. FIG. 3 is a plan view of a power supply unit provided with the same power supply device. FIG. 4 is an exploded perspective view of the power supply unit of the same as above. FIG. 5 is a plan view of the LED module in the same lighting device. FIG. 6 is an exploded perspective view of a lighting fixture provided with the same lighting device.

(1) Outline The following embodiment is only one of various embodiments of the present invention. The following embodiments can be variously modified according to the design and the like as long as the object of the present invention can be achieved.

As shown in FIG. 1, the power supply device 42 of the present embodiment is configured to supply a predetermined DC power to the load. The load of this embodiment is, for example, a solid-state light source. As shown in FIG. 1, the power supply device 42 is used in a lighting device 2 including, for example, a plurality of LED (Light Emitting Diode) elements 52 (52a, 52b) and 53 (53a, 53b) as a solid-state light source. However, the solid-state light source is not limited to the LED element, and may be a solid-state light source other than the LED element such as an organic electroluminescence element.

As shown in FIG. 1, the power supply device 42 includes a first conversion circuit 43c, a first control circuit 43d, a second conversion circuit 44a, a second control circuit 44b, a first board 431, and a second board 441. And have. The first conversion circuit 43c converts the input AC power into the first DC power. The first control circuit 43d controls the first conversion circuit 43c. The second conversion circuit 44a converts the first DC power into the second DC power having a voltage level different from the voltage level of the first DC power and supplies it to the load (LED elements 52, 53). The second control circuit 44b controls the second conversion circuit 44a.

A plurality of first circuit components 432 constituting the first conversion circuit 43c and the first control circuit 43d are mounted on the first substrate 431. A plurality of second circuit components 442 constituting the second conversion circuit 44a and the second control circuit 44b are mounted on the second substrate 441. The output terminals T1 and T2 of the first conversion circuit 43c and the input ends T3 and T4 of the second conversion circuit 44a are electrically connected to each other.

The first control circuit 43d is electrically connected to the second control circuit 44b and is fed from the second control circuit 44b to control the first conversion circuit 43c. The second control circuit 44b is configured to monitor the input AC power (pulsating voltage Vr). The second control circuit 44b is configured to supply power to the first control circuit 43d only when AC power is input to the first conversion circuit 43c.

According to this configuration, the second control circuit 44b is configured to supply power to the first control circuit 43d only when AC power is input to the first conversion circuit 43c. Therefore, for example, even when it is required to divide the circuit board into two parts and accommodate them in the case in consideration of the arrangement space of the circuit board, the arrangement is free while maintaining the reliability of operation. The degree can be increased.

(2) Details (2.1) Overall configuration of the lighting device Hereinafter, the power supply device 42 of the present embodiment and the lighting device 2 provided with the power supply device 42 will be described in detail with reference to FIGS. 1 to 6. As shown in FIG. 2, the lighting device 2 includes a case 3, a power supply unit 4, an LED module 5, and two lens blocks 6. In the following, the vertical, horizontal, and front-back directions of the lighting device 2 will be defined and described with reference to the up-down, left-right, front-back arrows shown in FIG. These arrows are provided only for the purpose of assisting the explanation and are not accompanied by substance.

(2.2) Case Case 3 has a first case 31 and a second case 32 as shown in FIG. The first case 31 is formed of a metal plate such as a steel plate in a rectangular box shape having an opening on the lower surface. The second case 32 is formed in a substantially rectangular plate shape by a metal plate such as a steel plate. An oval recess 311 is formed in the center of the upper surface of the first case 31, and a circular hole 312 penetrates in the center of the recess 311 in the vertical direction. Further, a circular hole 321 penetrates in the vertical direction in the center of the second case 32. Further, a rectangular through hole 324 penetrates in the vertical direction on one end side of the second case 32 in the longitudinal direction.

A collar portion 313 is formed along the longitudinal direction at the edge of the lower surface opening of the first case 31. Further, the longitudinal edge of the second case 32 is bent downward, and the second case 32 has a pair of side walls 322 along the longitudinal direction (left-right direction) at its front and rear ends. Further, a collar portion 323 is formed at the lower end of each side wall 322 along the longitudinal direction. Then, the collar portion 323 is screwed to the collar portion 313, so that the second case 32 is attached to the first case 31 so as to cover the lower surface of the first case 31. That is, the rectangular box-shaped case 3 is formed by connecting the first case 31 and the second case 32 to each other. The power supply unit 4 is housed inside the case 3.

(2.3) LED Module As shown in FIGS. 2 and 5, the LED module 5 includes two LED boards 51 and a plurality of LED elements 52 mounted on the mounting surface 51a (lower surface) of each LED board 51. And 53 (load). Each LED substrate 51 is formed in a long rectangular shape in the left-right direction. The two LED substrates 51 have the same shape and dimensions as each other. The two LED substrates 51 are formed of, for example, a glass cloth-based epoxy resin substrate.

As shown in FIG. 5, the two LED substrates 51 are arranged so that their first ends 51b in the longitudinal direction face each other. Each LED substrate 51 has a semicircular notch 51c at the center of the first end 51b. By arranging the first ends 51b of the two LED substrates 51 so as to face each other, the notches 51c of the two LED substrates 51 form one circular through hole 51d.

On the mounting surface 51a of each LED board 51, a plurality of LED elements 52 are mounted in, for example, four rows so as to be arranged along the longitudinal direction of the LED board 51 in the mounting area 51g. In the present embodiment, the plurality of LED elements 52 include a daylight color LED element 52a and a light bulb color LED element 52b. Further, on the mounting surface 51a of each LED substrate 51, a plurality of light bulb-colored LED elements 53 are mounted side by side in the longitudinal direction in the vicinity of the front edge and the vicinity of the trailing edge, respectively. In the present embodiment, the LED element arranged in the vicinity of the front edge is referred to as an LED element 53a, and the LED element arranged in the vicinity of the trailing edge is referred to as an LED element 53b.

Conductors (copper foil) electrically connected to the plurality of LED elements 52 and 53 are formed on the mounting surface 51a (lower surface) and the back surface (upper surface) of the LED substrate 51. If necessary, the conductor on the mounting surface 51a and the conductor on the back surface may be electrically connected to each other by a through hole provided in the LED substrate 51.

The LED substrate 51 is attached to the lower surface of the second case 32 by screws inserted into the four positioning holes 51h.

As shown in FIG. 5, the two LED substrates 51 are electrically connected to each other via a plurality of electric wires 54. Specifically, the receptacle connectors 541a and 542a are mounted on the mounting surface 51a of each LED board 51. The receptacle connectors 541a and 542a are arranged side by side in the lateral direction of the LED substrate 51 with the mounting area 51g interposed therebetween. The receptacle connectors 541a and 542a are electrically connected to the conductor of the LED substrate 51. The receptacle connector 541a is electrically and mechanically connected to the plug connector 541b so that it can be inserted and removed. One receptacle connector 541a and one plug connector 541b constitute one connector 541. The two plug connectors 541b are electrically connected by a plurality of electric wires 54.

The number of electric wires 54 in this embodiment is four as an example. The plurality of LED elements 52 and 53 mounted on one LED board 51 and the plurality of LED elements 52 and 53 mounted on the other LED board 51 are electrically connected by four electric wires 54, respectively. Be connected.

That is, the plurality of LED elements 52a mounted on the two LED boards 51 are electrically connected in series, and the plurality of LED elements 52b mounted on the two LED boards 51 are electrically connected in series. There is. Further, the plurality of LED elements 53a mounted on the two LED boards 51 are electrically connected in series, and the plurality of LED elements 53b mounted on the two LED boards 51 are electrically connected in series. There is.

Of the two LED boards 51, the receptacle connector 542a of one of the LED boards 51 is electrically and mechanically connected to the plug connector 542b to which a plurality of electric wires 461 are connected so that it can be inserted and removed. Of the two LED boards 51, the receptacle connector 542a of the other LED board 51 is electrically and mechanically connected to the plug connector 542b to which a plurality of electric wires 462 are connected so as to be removable. One connector 542 is composed of one receptacle connector 542a and one plug connector 542b.

That is, one of the two LED boards 51 is electrically connected to each positive potential of the load voltage V21-V24 output by the step-down chopper circuit PS1-PS4, which will be described later. The other LED substrate 51 is electrically connected to each negative potential of the load voltage V21-V24 output by the step-down chopper circuits PS1-PS4. That is, each of the step-down chopper circuits PS1-PS4 can pass a load current through each closed loop via the electric wire 461, one LED substrate 51, the electric wire 54, the other LED substrate 51, and the electric wire 462.

(2.4) Lens Block Each of the two lens blocks 6 has a substantially rectangular plate-shaped base 60 and a plurality of lenses 61, as shown in FIG. The plurality of lenses 61 are mounted in four rows so as to be arranged along the longitudinal direction of the base 60 on the lower surface of the base 60. Each lens 61 has a convex shape protruding downward on the lower surface of the base 60. The base 60 and the plurality of lenses 61 are integrally formed of, for example, a molded body of glass or a synthetic resin (acrylic resin or polycarbonate resin) having translucency.

The base 60 is formed with a pair of triangular ribs 601 protruding outward from the centers of both side edges, and a cylindrical positioning protrusion 602 projects upward on the lower surface of the ribs 601. Then, the lens block 6 is positioned with the LED substrate 51 by engaging the two protrusions 602 one-to-one with the two positioning holes 51j (see FIG. 5) formed in the LED substrate 51.

An arcuate notch 60b is formed at the first end 60a of the base 60 in the longitudinal direction. Further, a substantially rectangular translucent window 60d is formed at the second end 60c (the end opposite to the first end 60a) in the longitudinal direction of the base 60. The positioning lens block 6 is arranged on the mounting surface 51a of the LED substrate 51 so that the arc-shaped notch 60b follows the semicircular notch 51c of the LED substrate 51. Therefore, the two lens blocks 6 are attached to the two LED substrates 51 so that their first ends 60a face each other.

The translucent window 60d faces the notch 51f formed in the LED substrate 51. Of the two lens blocks 6, the translucent window 60d of one lens block 6 is a nightlight arranged on the second substrate 441 of the power supply unit 4, which will be described later, via the notch 51f and the through hole 324. And facing the infrared light receiving element (not shown). The plurality of lenses 61 face one-to-one with the plurality of LED elements 52, and are provided below the mounting area 51g of the LED substrate 51.

(2.5) Power Supply Unit (2.5.1) Overall Configuration As shown in FIGS. 2 to 4, the power supply unit 4 includes a mounting base 40, a holder 41, and a power supply device 42. The power supply device 42 is configured to convert AC power supplied from the AC power supply E1 (for example, a commercial AC power supply) into DC power and supply the DC power to the LED module 5. The power supply device 42 includes a first circuit block 43, a second circuit block 44, and a connection portion CN1. The connection portion CN1 is for electrically connecting the first circuit block 43 and the second circuit block 44 to each other, and is a pair of first electric wires L11 and L11, a second electric wire L12, and a third electric wire L13. And have. In the present embodiment, the first electric wires L11 and L11, the second electric wires L12, and the third electric wire L13 are bundled by a sheath to form one cable as shown in FIG.

As shown in FIG. 1, the AC power supply E1 outputs an AC voltage Vac to the power supply device 42. The switch SW0 (see FIG. 1) provided in the middle of the electric circuit connecting the AC power supply E1 and the power supply device 42 enables the input / disconnection of the AC voltage Vac from the AC power supply E1 to the power supply device 42. It is desirable that it is configured.

(2.5.2) Power supply (first circuit block)
Hereinafter, the first circuit block 43 will be described with reference to FIG. The first circuit block 43 receives a AC voltage Vac from the AC power supply E1 to perform a boosting operation, and controls a power factor improving circuit 43a that outputs a boosted DC voltage (boosting voltage) and a power factor improving circuit 43a. It includes a control circuit 43d. The power factor improving circuit 43a includes an input circuit 43b, a first conversion circuit 43c, and an inrush current prevention circuit 43e.

The input circuit 43b is composed of, for example, a filter circuit and a diode bridge circuit (rectifier circuit) composed of a plurality of diodes (not shown). The input circuit 43b generates a pulsating voltage Vr obtained by full-wave rectifying the AC voltage Vac input to the power factor improving circuit 43a and outputs the pulsating voltage Vr to the first conversion circuit 43c.

The inrush current prevention circuit 43e is composed of, for example, a thermistor, and is inserted between the input circuit 43b (the output end on the positive electrode side) and the first conversion circuit 43c (the input end on the positive electrode side). The inrush current prevention circuit 43e suppresses the inrush current (overcurrent) immediately after the power is turned on from flowing into the first conversion circuit 43c.

The first conversion circuit 43c is configured to convert the input AC power (pulsating voltage Vr) into the first DC power. The first conversion circuit 43c is, for example, a boost chopper circuit. The first conversion circuit 43c boosts the pulsating voltage Vr and generates a DC voltage Vdc (boosting voltage Vdc) as the first DC power. The first conversion circuit 43c has a smoothing capacitor C1 (first capacitor) connected between the pair of output terminals T1 and T2. The capacitor C1 is, for example, an electrolytic capacitor. The DC voltage Vdc is smoothed by the capacitor C1 and output to the second circuit block 44 in the subsequent stage. In FIG. 1, the circuit elements (semiconductor switching elements and the like) constituting the first conversion circuit 43c other than the capacitor C1 are not shown.

The first control circuit 43d is composed of, for example, a computer, a driver circuit, and the like. The first control circuit 43d is configured to perform switching control of the semiconductor switching element in the first conversion circuit 43c by executing a program by a computer. The main configuration of this computer is a device equipped with a processor that executes a program, a device for an interface for sending and receiving signals to and from other devices, and a device for storing programs, data, and the like. Prepare as an element. The device provided with the processor may be either a CPU (Central Processing Unit) or MPU (Micro Processing Unit), which is separate from the storage device, or a microcomputer integrally equipped with the storage device. As a storage device, a storage device having a short access time such as a semiconductor memory is mainly used. Examples of the form of providing the program include a form in which a computer-readable semiconductor memory and a recording medium such as an optical disk are stored in advance, and a form in which the program is supplied to the recording medium via a wide area communication network including the Internet and the like.

In short, the circuit control of the first conversion circuit 43c is performed by the first control circuit 43d. However, the first control circuit 43d is configured to receive the control voltage (control power supply) Vcc from the second control circuit 44b of the second circuit block 44, which will be described later. In other words, when the supply of the control voltage Vcc from the second control circuit 44b is stopped, the operation of the first conversion circuit 43c is stopped.

The first circuit block 43 further includes a first board (power supply board) 431 which is a printed wiring board. A plurality of first circuit components 432 constituting the above-mentioned input circuit 43b, inrush current prevention circuit 43e, first conversion circuit 43c, and first control circuit 43d are mounted on the first substrate 431. The plurality of first circuit components 432 include semiconductor switching elements, thermistors, inductors, diodes, capacitors, resistors, integrated circuit components for arithmetic processing, driver circuit components, and the like.

(2.5.3) Power supply (second circuit block)
Hereinafter, the second circuit block 44 will be described with reference to FIG. The second circuit block 44 includes a second conversion circuit 44a and a second control circuit 44b. The second conversion circuit 44a converts the first DC power into the second DC power having a voltage level different from the voltage level of the first DC power, and supplies the first DC power to the plurality of LED elements 52 and 53 of the LED module 5 which is a load. It is configured to do. The second conversion circuit 44a is a step-down type DC-that supplies a DC load current to the LED module 5 by stepping down the boost voltage Vdc (first DC power) output by the first circuit block 43 to the second DC power. It constitutes a DC converter.

Here, the pair of input ends T3 and T4 of the second conversion circuit 44a and the pair of output ends T1 and T2 of the first conversion circuit 43c of the first circuit block 43 are electrically connected to each other, respectively. .. Specifically, the pair of input ends T3 and T4 and the pair of output ends T1 and T2 are connected via a pair of first electric wires L11 and L11 (DC voltage line and ground line) of the connecting portion CN1. There is.

The second conversion circuit 44a includes a filter circuit 440a and a step-down chopper block 440b. The filter circuit 440a is composed of, for example, an inductor L1 and a capacitor C2 (second capacitor). The filter circuit 440a is provided as a pre-stage circuit of the step-down chopper block 440b, and attenuates harmonic components generated by the switching operation of the step-down chopper block 440b. The filter circuit 440a has a cutoff frequency that is at least twice the frequency of the AC voltage (for example, 50 Hz or 60 Hz) and at least the minimum value of the oscillation frequency of the first conversion circuit 43c or the second conversion circuit 44a. It is preferable to do so.

The step-down chopper block 440b has four step-down chopper circuits PS1-PS4. The four step-down chopper circuits PS1-PS4 step-down the step-up voltage Vdc output from the first circuit block 43 and whose harmonic components are attenuated by the filter circuit 440a to a voltage V21-V24 (load voltage V21-V24), respectively. do. The four step-down chopper circuits PS1-PS4 output the load voltage V21-V24 to the LED elements 52a, 52b, 53a, and 53b, respectively. Therefore, a load voltage V21-V24, which is a direct current voltage, is applied to each of these LED elements, and the current flowing through each LED element is also controlled to a predetermined constant current. The second conversion circuit 44a may have an isolated DC-DC converter (for example, a flyback converter) instead of the non-isolated DC-DC converter (step-down chopper circuit PS1-PS4).

The second control circuit 44b has a control power supply circuit CP1 and a control block CB1. The circuit control of the step-down chopper block 440b is performed by the second control circuit 44b.

The control power supply circuit CP1 generates a control voltage (control power supply) Vcc for driving the power supply device 42. In the present embodiment, the control power supply circuit CP1 generates the control voltage Vcc from the boosted voltage Vdc whose harmonic components are attenuated by the filter circuit 440a. However, the control power supply circuit CP1 may generate the control voltage Vcc from the boosted voltage Vdc before being input to the filter circuit 440a.

The control block CB1 is composed of a computer, a driver circuit, and the like. The control block CB1 is configured to perform switching control of the semiconductor switching element in the step-down chopper block 440b by executing a program by a computer. In addition to the computer and driver circuits, the control block CB1 has peripheral circuits such as a buzzer, an LED element for a nightlight, and an infrared light receiving element. These peripheral circuits are protected so as to cover the periphery by the tubular body 325 shown in FIG. The infrared light receiving element can receive an infrared signal transmitted from an infrared remote controller through the translucent window 60d. It is preferable that the control block CB1 controls the lighting of the LED module 5 in response to a command included in the infrared signal received by the infrared light receiving element.

The computer mainly consists of a device provided with a processor that executes a program, a device for an interface for sending and receiving signals to and from other devices, and a storage device for storing programs and data. Prepare as an element. The device including the processor may be either a CPU or MPU that is separate from the storage device, or a microcomputer that is integrally equipped with the storage device. As a storage device, a storage device having a short access time such as a semiconductor memory is mainly used. Examples of the form of providing the program include a form in which a computer-readable semiconductor memory and a recording medium such as an optical disk are stored in advance, and a form in which the program is supplied to the recording medium via a wide area communication network including the Internet and the like.

The second circuit block 44 further includes a second board (power supply board) 441 which is a printed wiring board. That is, in the power supply device 42 of the present embodiment, the second substrate 441 is provided separately from the first substrate 431. The second conversion circuit 44a described above and a plurality of second circuit components 442 constituting the second control circuit 44b are mounted on the second substrate 441. The plurality of second circuit components 442 include semiconductor switching elements, inductors, diodes, capacitors, resistors, integrated circuit components for arithmetic processing, driver circuit components, and the like.

By the way, the second control circuit 44b is electrically connected to the first control circuit 43d of the first circuit block 43 via the third electric wire L13 (control line) of the connecting portion CN1. Then, the second control circuit 44b not only supplies the control voltage Vcc generated by the control power supply circuit CP1 to the computer of its own control block CB1, but also supplies the first control circuit 43d of the first circuit block 43 to the third control circuit 43d. It is configured to be supplied via the electric wire L13.

However, the second control circuit 44b further monitors (detects) the pulsating voltage Vr input to the input terminal of the first conversion circuit 43c via the second electric wire L12 of the connecting portion CN1, and the pulsating voltage Vr is increased. A determination process for determining whether or not the input is input to the first conversion circuit 43c is performed. That is, the second electric wire L12 (input detection line) is an electric wire for notifying the first circuit block 43 to the second circuit block 44 that the supply of AC power to the power factor improving circuit 43a has started. .. Then, the second control circuit 44b supplies the control voltage Vcc to the first control circuit 43d only when it is determined that the pulsating voltage Vr is input to the first conversion circuit 43c. Regarding this determination process, the second control circuit 44b determines that the pulsating voltage Vr is input to the first conversion circuit 43c, for example, by periodically zero-crossing the voltage signal corresponding to the pulsating voltage Vr. ..

(2.5.4) Mounting Base and Wiring Circumference The wiring surroundings of the mounting base 40 and the power supply unit 4 will be described below with reference to FIGS. 2 to 4. The mounting base 40 is formed in a rectangular flat plate shape by a material having electrical insulation such as synthetic resin. An oval hole 401 penetrates the mounting base 40 in the vertical direction. A long cylindrical partition wall 402 projecting downward is provided around the hole 401 on the lower surface of the mounting base 40.

The first circuit block 43 and the second circuit block 44 are arranged along the longitudinal direction of the mounting base 40 with the partition wall 402 interposed therebetween, and the first board 431 and the second board 441 are placed on the lower surface of the mounting base 40. It is screwed and attached. That is, the power supply device 42 is attached to the lower surface of the mounting base 40.

Here, the first substrate 431 of the power supply device 42 is formed in a rectangular plate shape, and has insertion holes 436 (only two are shown in FIG. 4) at three corners as shown in FIG. There is. Further, on the lower surface of the mounting base 40, as shown in FIGS. 3 and 4, three positioning protrusions 405a project from the location where the first substrate 431 is arranged. Then, the first substrate 431 is positioned on the lower surface of the mounting base 40 by inserting the three protrusions 405a into the three insertion holes 436, respectively. Further, a locking claw 407a is formed on the outer peripheral side of the partition wall 402. Then, the locking claw 407a presses the surface 433 (lower surface) of the first substrate 431, so that the first substrate 431 is positioned in the vertical direction.

The second substrate 441 of the power supply device 42 is formed in a rectangular plate shape, and has insertion holes 448 at four corners as shown in FIG. Further, on the lower surface of the mounting base 40, as shown in FIGS. 3 and 4, three positioning protrusions 405b project from the location where the second substrate 441 is arranged. Then, the second substrate 441 is positioned on the lower surface of the mounting base 40 by inserting the three insertion holes 448 out of the four insertion holes 448 into the three protrusions 405b, respectively. Further, a locking claw 407b is formed on the outer peripheral side of the partition wall 402, and a locking claw 407c is formed on the right end portion of the mounting base 40. Then, the locking claws 407b and 407c press the surface 443 (lower surface) of the second substrate 441, so that the second substrate 441 is positioned in the vertical direction.

Further, on the lower surface of the mounting base 40, as shown in FIG. 4, a convex wall 409 having a substantially rectangular frame shape is formed at a position facing the back surface 434 (upper surface) of the first substrate 431, and the convex wall 409 is formed. A thermal sheet made of silicon or the like is placed inside the. The thermal sheet efficiently dissipates heat from the first substrate 431 by transmitting the heat generated by the first substrate 431 to the mounting base 40.

Conductors (copper foil) electrically connected to a plurality of first circuit components 432 are formed on the front surface 433 (lower surface) and the back surface 434 (upper surface) of the first substrate 431. If necessary, the conductor of the front surface 433 and the conductor of the back surface 434 may be electrically connected to each other by a through hole provided in the first substrate 431.

Here, the receptacle connector 430a is mounted on the surface 433 of the first substrate 431. A hook sealing adapter 102 (see FIG. 6) is inserted into the tubular body 410 of the holder 41, and the receptacle connector 430a can be inserted and removed from a plug connector (not shown) electrically connected to the electrode of the hook sealing adapter 102. Is electrically and mechanically connected to. The receptacle connector 430a receives AC power from the hook sealing adapter 102. Further, the receptacle connector 430a is electrically connected to the conductor of the first substrate 431. In other words, the receptacle connector 430a is electrically connected to the input end of the input circuit 43b of the first circuit block 43. An electric wire holding portion 404a is provided on the outer surface of the partition wall 402. The electric wire holding portion 404a holds an electric wire (not shown) connected to the receptacle connector 430a in order to suppress the tension applied to the electric wire.

Further, a receptacle connector 435a is mounted on the surface 433 of the first substrate 431, and the receptacle connector 435a is electrically connected to the conductor of the first substrate 431. The receptacle connector 435a is electrically and mechanically and detachably connected to the plug connector 435b, which has a one-to-one correspondence with the receptacle connector 435a. One connector 435 is composed of one receptacle connector 435a and one plug connector 435b.

The plug connector 435b is electrically and mechanically connected to one end of the first electric wire L11, L11, the second electric wire L12, and the third electric wire L13 of the connecting portion CN1. A plug connector 445b is electrically and mechanically connected to the other ends of these four electric wires. The plug connector 445b is electrically and mechanically connected to the receptacle connector 445a mounted on the front surface 443 (lower surface) of the second substrate 441 so as to be removable. Conductors (copper foil) electrically connected to a plurality of second circuit components 442 are formed on the front surface 443 and the back surface 444 (upper surface) of the second substrate 441. If necessary, the conductor on the front surface 443 and the conductor on the back surface 444 may be electrically connected to each other by a through hole provided in the second substrate 441. The receptacle connector 445a is electrically connected to the conductor of the second substrate 441. One connector 445 is composed of one receptacle connector 445a and one plug connector 445b. An electric wire holding portion 404b is provided on the outer surface of the partition wall 402. The electric wire holding portion 404b holds the connecting portion CN1 in order to suppress the tension applied to the electric wire.

As described above, the first circuit block 43 and the second circuit block 44 are electrically connected to each other via the connection portion CN1. In the present embodiment, the first electric wire L11, L11, the second electric wire L12, and the third electric wire L13 form a DC voltage line, a ground line, an input detection line, and a control line, respectively.

Further, as shown in FIGS. 3 and 4, in the second circuit block 44, two receptacle connectors 446a and 447a are further mounted on the surface 443 of the second substrate 441. The receptacle connector 446a is electrically connected to each positive potential of the load voltage V21-V24 output by the step-down chopper circuit PS1-PS4. The receptacle connector 447a is electrically connected to each negative potential of the load voltage V21-V24 output by the step-down chopper circuit PS1-PS4.

Then, the receptacle connector 446a is electrically and mechanically and electrically connected to the plug connector 446b, which has a one-to-one correspondence with the receptacle connector 446a. The plug connector 446b is electrically and mechanically connected to one end of a plurality of electric wires 461. Further, the receptacle connector 447a is electrically and mechanically and electrically connected to the plug connector 447b, which has a one-to-one correspondence with the receptacle connector 447a. The plug connector 447b is electrically and mechanically connected to one end of a plurality of electric wires 462. One connector 446 is composed of one receptacle connector 446a and one plug connector 446b. Further, one receptacle connector 447a and one plug connector 447b constitute one connector 447.

The output of the second conversion circuit 44a (each output of the step-down chopper circuits PS1-PS4) is electrically connected to the LED module 5 via a plurality of electric wires 461 and 462.

(2.5.5) Holder Hereinafter, the holder 41 will be specifically described. As shown in FIG. 3, the holder 41 has a tubular body 410 that supports the hook sealing adapter 102 (see FIG. 6), and a fixing plate 411 that is integrally formed with the tubular body 410. The fixing plate 411 is formed of a synthetic resin into a circular flat plate shape. A circular hole penetrates the center of the fixing plate 411. The tubular body 410 is formed in a cylindrical shape by a synthetic resin. The tubular body 410 is integrally formed with the fixing plate 411 so as to project downward from the peripheral edge of the hole on the lower surface of the fixing plate 411. The fixing plate 411 of the holder 41 is screwed to the mounting base 40. The tubular body 410 of the holder 41 is arranged inside the partition wall 402 with the fixing plate 411 screwed to the mounting base 40. The long cylindrical internal space of the partition wall 402 is the long cylindrical insertion space 403, and the tubular body 410 of the holder 41 is arranged in the insertion space 403.

(2.5.6) Assembly of Power Supply Device Here, the assembly of the power supply device 42 to the ceiling will be briefly described. As shown in FIG. 2, the power supply unit 4 is attached to the first case 31 by screwing the mounting base 40 to the first case 31, and is housed in the case 3. The lower end of the partition wall 402 of the mounting base 40 is inserted into the hole 321 of the second case 32. The hook sealing adapter 102 (see FIG. 6) is inserted into the tubular body 410 of the holder 41. In other words, the hook sealing adapter 102 corresponding to the feeding portion is inserted into the insertion space 403 in the partition wall 402.

Then, the hook ceiling adapter 102 is detachably attached to the hook ceiling body 101 (see FIG. 6) installed on the ceiling. The case 3 is detachably attached to the hook sealing adapter 102. That is, the case 3 is detachably attached to the hook sealing body 101 via the hook sealing adapter 102, and is supported by the hook sealing body 101 via the hook sealing adapter 102. However, since the hook sealing body 101 and the hook sealing adapter 102 are well known in the past, detailed configuration illustration and description will be omitted.

(2.5.7) Description of Operation of Power Supply Device The operation of the power supply device 42 will be described below with reference to FIG.

First, the power supply device 42 when none of the electric wires L11 to L13 is broken and the connectors 435 and 445 are not disconnected or loosely contacted (that is, no wiring abnormality has occurred). The operation of is described.

For example, when the switch SW0 is switched from off to on, the supply of the AC voltage Vac from the AC power supply E1 is started. In the power factor improving circuit 43a of the first circuit block 43, the input circuit 43b generates a pulsating voltage Vr obtained by full-wave rectifying the AC voltage Vac, and outputs the pulsating voltage Vr to the first conversion circuit 43c via the inrush current prevention circuit 43e. ..

However, at this time, since the first control circuit 43d has not received the control voltage Vcc from the second control circuit 44b of the second circuit block 44, the boosting operation of the first conversion circuit 43c has not started. On the other hand, the capacitor C1 in the first conversion circuit 43c is charged to the peak voltage of the pulsating voltage Vr, and further, the capacitor C2 of the filter circuit 440a of the second circuit block 44 also passes through the first electric wires L11 and L11. It will be charged.

Then, the control power supply circuit CP1 of the second control circuit 44b generates a control voltage Vcc of, for example, 16V from the voltage across the charged capacitor C2, and supplies the control voltage Vcc to the computer (for example, a microcomputer) of the control block CB1. As a result, the computer of the control block CB1 starts operating.

Next, the control block CB1 of the second control circuit 44b receives a voltage signal (AC power supply information) corresponding to the pulsating voltage Vr from the power factor improving circuit 43a via the second electric wire L12. The control block CB1 performs a determination process of whether or not the pulsating voltage Vr is input to the first conversion circuit 43c based on the frequency of this voltage signal (based on the zero crossing point). During the operation of the control block CB1, this determination process is performed periodically.

Since the pulsating voltage Vr is input here, the second control circuit 44b supplies the control voltage Vcc to the computer (for example, a microcomputer) of the first control circuit 43d via the third electric wire L13. As a result, the computer of the first control circuit 43d starts operating, and the boosting operation of the first conversion circuit 43c is started under the control of the first control circuit 43d. At this time, it is preferable that the second control circuit 44b starts the step-down operation of the step-down chopper block 440b after confirming that the voltage boosted by the first conversion circuit 43c is within the normal range. Then, when the step-down operation of the step-down chopper block 440b is started, the LED elements 52 and 53 of the LED module 5 are turned on.

Subsequently, for example, when the switch SW0 is switched from on to off, or when a power failure of the AC power supply E1 occurs, the pulsating voltage Vr is not input to the first conversion circuit 43c in the control block CB1 through the above determination process. Is determined. Then, the control block CB1 stops the supply of the control voltage Vcc to the first control circuit 43d, and stops the boosting operation of the first conversion circuit 43c. Further, the control block CB1 stops the step-down operation of the step-down chopper block 440b.

Here, it is desirable that the control block CB1 can continue to operate for a predetermined time or longer in the event of a power failure of the AC power supply E1. Therefore, the total capacitance of the capacitor C1 and the capacitor C2 of the present embodiment supplies energy (electric power) for continuing the operation of the second control circuit 44b for a predetermined time or longer to the control power supply circuit CP1 in the event of a power failure of the AC power supply E1. It is set to a possible capacitance. Therefore, in the event of a power failure of the AC power supply E1, the control block CB1 can quickly stop the step-up operation of the first conversion circuit 43c and the step-down operation of the step-down chopper block 440b, and can suppress the consumption of the control voltage Vcc. ..

By the way, the lighting device 2 has a function (so-called one-two function) of switching the light output level of the LED module 5 from, for example, 100% to 50% by turning it on again within, for example, 2 seconds after the switch SW0 is switched from on to off. May be granted. Considering this point, the predetermined time described above is preferably about 2 seconds or more. That is, in the one-two operation, the capacitances of the capacitors C1 and C2 are set so that the control block CB1 can continue to operate for at least 2 seconds when the switch SW0 is temporarily turned off. preferable. In the one-two function, instead of switching the light output level, the lighting of the LED module 5 as the main light source and the lighting of the nightlight as the sub light source may be alternately switched.

Finally, the operation of the power supply device 42 when the first electric wire L11 is broken, or when the connectors 435 and 445 are disconnected or in a loose contact state (that is, when a wiring abnormality occurs) will be described.

For example, when the switch SW0 is switched from off to on, the supply of the AC voltage Vac from the AC power supply E1 is started. In the power factor improving circuit 43a of the first circuit block 43, the input circuit 43b generates a pulsating voltage Vr obtained by full-wave rectifying the AC voltage Vac, and outputs the pulsating voltage Vr to the first conversion circuit 43c via the inrush current prevention circuit 43e. ..

However, since the first control circuit 43d does not receive the control voltage Vcc from the second control circuit 44b of the second circuit block 44, the boosting operation of the first conversion circuit 43c has not started. On the other hand, the capacitor C1 in the first conversion circuit 43c is charged to the peak voltage of the pulsating voltage Vr. However, due to the occurrence of the above wiring abnormality, the capacitor C2 of the filter circuit 440a of the second circuit block 44 is not charged. Therefore, the control voltage Vcc is not generated by the control power supply circuit CP1 of the second control circuit 44b, and as a result, the computer of the control block CB1 is not operated. Therefore, the control voltage Vcc is not supplied to the first control circuit 43d, and as a result, the boosting operation of the first conversion circuit 43c is also maintained in the stopped state.

Therefore, it is possible to reduce the situation in which the boosting operation of the first conversion circuit 43c is performed even though the above wiring abnormality has occurred. Therefore, it is possible to prevent an abnormal discharge from occurring at the location where the wiring abnormality occurs. Further, it is possible to suppress the occurrence of unnecessary power consumption due to the operation of the first conversion circuit 43c when the above wiring abnormality occurs.

Even when the second electric wire L12 or the third electric wire L13 is disconnected, the control voltage Vcc is not supplied to the first control circuit 43d, and as a result, the boosting operation of the first conversion circuit 43c is also maintained in the stopped state. Will be done. Therefore, also in this case, it is possible to prevent the first conversion circuit 43c from operating and causing unnecessary power consumption.

As described above, in the lighting device 2 having the power supply device 42 of the present embodiment, the insertion space 403 for inserting the hook sealing adapter 102 is arranged at the center in the longitudinal direction of the case 3. Therefore, considering the arrangement space of the circuit board, it is divided into two, the first board 431 and the second board 441, as in the present embodiment, and the case 3 is placed so that these circuit boards sandwich the insertion space 403. May be required to be contained.

However, simply electrically connecting the two divided circuit boards with a cable (electric wire) may impair the reliability of the circuit operation if an abnormality such as disconnection or disconnection of the cable occurs. In addition, there is a possibility that the cable becomes an antenna and an obstacle of electromagnetic noise occurs, resulting in unstable operation.

On the other hand, in the present embodiment, as described above, the second control circuit 44b performs a determination process for determining whether or not the pulsating voltage Vr is input to the first conversion circuit 43c. Then, the second control circuit 44b supplies the control voltage Vcc to the first control circuit 43d only when it is determined that the pulsating voltage Vr is input to the first conversion circuit 43c. Therefore, it is possible to increase the degree of freedom in arranging the circuit board while maintaining the reliability of operation.

In particular, if the two divided circuit boards are simply connected by a cable, the cable may act as an antenna and cause an obstacle of electromagnetic noise. However, in the present embodiment, since the first electric wire L11 is a line through which the DC voltage Vdc (boosting voltage) passes instead of the AC voltage, it is relatively unlikely to be a source of noise. Similarly, the third electric wire L13 is also a line through which the control voltage Vcc, which is a DC voltage, passes, so that it is relatively unlikely to be a source of noise. Further, it can be said that the second electric wire L12 is also unlikely to be a source of noise because it is a line through which a voltage signal having a relatively low frequency passes.

Further, in the present embodiment, since the filter circuit 440a is provided in front of the step-down chopper block 440b, leakage of switching noise generated in the step-down chopper block 440b to the first electric wire L11 side is suppressed.

(3) Lighting Equipment By the way, the lighting device 2 of the present embodiment may be used for the lighting equipment 1 shown in FIG. 6, for example. The lighting fixture 1 includes a lighting device 2 and a fixture main body 9 that supports the lighting device 2. The instrument body 9 has a cover 91, a frame 92, a glove 93, and a pair of light guide members 94, 94.

A frame 92 is screwed to the lower surface of the case 3 of the lighting device 2. The frame 92 includes a rectangular frame-shaped main frame 92a and a reinforcing frame 92b that connects the centers of a pair of side frames along the longitudinal direction of the main frame 92a in the lateral direction. Then, the frame 92 is positioned with the LED substrate 51 by engaging the protrusions protruding upward at the longitudinal edge of the main frame 92a with the positioning holes provided in the LED substrate 51.

Further, the light guide members 94 are screwed to the pair of side frames along the longitudinal direction of the main frame 92a. As shown in FIG. 6, the light guide member 94 includes a light guide panel 94a, a guide portion 94b, and a plurality of (four in the illustrated example) mounting pieces 94c. The light guide panel 94a, the guide portion 94b, and the plurality of mounting pieces 94c are preferably formed of a translucent synthetic resin such as an acrylic resin or a polycarbonate resin. Then, the mounting piece 94c is screwed to the main frame 92a.

When each light guide member 94 is screwed to the main frame 92a, the LED element 53a is located above the guide portion 94b. The guide unit 94b has a reflector that reflects light, and the light emitted by the LED element 53a is guided into the light guide panel 94a through the guide unit 94b and emitted from the light guide panel 94a.

Further, a rectangular flat plate glove 93 is attached to the lower surface of the frame 92. The main frame 92a has a fixture 95 on a side frame along the longitudinal direction. The glove 93 is formed of a translucent synthetic resin material such as acrylic into a rectangular box shape having an open upper surface, and is attached to the lower surface side of the frame 92 via a fixture 95. Further, the glove 93 has a diffusion structure for diffusing the light emitted from the lighting device 2. The diffusion structure is realized by, for example, a white coating film formed on the surface of the glove 93, a diffusing material mixed in the synthetic tree material forming the glove 93, or irregularities formed on the surface of the glove 93. Will be done. Since the glove 93 is provided with the diffusion structure in this way, the uniformity of the light radiated to the illumination space can be further improved.

A cover 91 is screwed to the upper surface of the case 3. The cover 91 is formed in a rectangular box shape with an opening on the lower surface, and has an opening 911 on the upper surface for exposing the recess 311.

The luminaire 1 is a luminaire directly mounted on the ceiling (so-called ceiling light). However, the lighting fixture 1 is not limited to the ceiling light, and may be a hanging type (so-called pendant type) lighting fixture, an embedded lighting fixture (so-called downlight), or the like.

(4) Modification examples The following is a list of some modification examples. Hereinafter, the above-described embodiment will be referred to as a “basic example”.

In the basic example, the filter circuit 440a is provided in front of the step-down chopper block 440b. However, the filter circuit 440a is not an essential component in the power supply device 42 and may be omitted. However, it is preferable that the filter circuit 440a is provided in order to prevent the switching noise from leaking to the first electric wire L11.

When the filter circuit 440a is not provided, the capacitor C1 alone of the first conversion circuit 43c can supply the control power supply circuit CP1 with energy for continuing the operation of the second control circuit 44b for a predetermined time or longer in the event of a power failure. It preferably has a capacitance.

In the basic example, the second electric wire L12 is connected to the connection point between the inrush current prevention circuit 43e and the input end of the first conversion circuit 43c. However, the position where the second electric wire L12 is connected is not particularly limited as long as the second control circuit 44b can monitor the electric power including the AC component before being converted into the DC voltage Vdc by the first conversion circuit 43c.

(5) Advantages As described above, the power supply device 42 according to the first aspect includes the first conversion circuit 43c, the first control circuit 43d, the second conversion circuit 44a, the second control circuit 44b, and the second. It includes one substrate 431 and a second substrate 441. The first conversion circuit 43c converts the input AC power into the first DC power. The first control circuit 43d controls the first conversion circuit 43c. The second conversion circuit 44a converts the first DC power into the second DC power having a voltage level different from the voltage level of the first DC power and supplies it to the load (LED elements 52, 53). The second control circuit 44b controls the second conversion circuit 44a. A plurality of first circuit components 432 constituting the first conversion circuit 43c and the first control circuit 43d are mounted on the first substrate 431. A plurality of second circuit components 442 constituting the second conversion circuit 44a and the second control circuit 44b are mounted on the second substrate 441. The output ends (T1, T2) of the first conversion circuit 43c and the input ends (T3, T4) of the second conversion circuit 44a are electrically connected to each other. The first control circuit 43d is electrically connected to the second control circuit 44b and is fed from the second control circuit 44b to control the first conversion circuit 43c. The second control circuit 44b is configured to monitor the input AC power. The second control circuit 44b is configured to supply power to the first control circuit 43d only when AC power is input to the first conversion circuit 43c. According to the first aspect, the degree of freedom of arrangement can be increased while maintaining the reliability of operation.

Regarding the power supply device 42 according to the second aspect, in the first aspect, the second control circuit 44b determines that the AC power is input to the first conversion circuit 43c by periodically zero-crossing the AC voltage. It is preferable to do so. According to the second aspect, it is possible to more accurately determine that the AC power is input to the first conversion circuit 43c.

Regarding the power supply device 42 according to the third aspect, in the first or second aspect, it is preferable that the second conversion circuit 44a has a filter circuit 440a for attenuating harmonic components as a pre-stage circuit. According to the third aspect, leakage of switching noise generated in the first conversion circuit 43c or the second conversion circuit 44a can be suppressed.

Regarding the power supply device 42 according to the fourth aspect, in the third aspect, the filter circuit 440a is at least twice the frequency of the AC voltage and the minimum oscillation frequency of the first conversion circuit 43c or the second conversion circuit 44a. It is preferable to have a cutoff frequency that is equal to or less than the value. According to the fourth aspect, leakage of switching noise can be suppressed more effectively.

Regarding the power supply device 42 according to the fifth aspect, in any one of the first to fourth aspects, the second control circuit 44b is the first from the first DC power input to the input terminals (T3, T4). It is preferable to have a control power supply circuit CP1 that generates control power for supplying power to the control circuit 43d. The first conversion circuit 43c preferably has a capacitor C1 connected between a pair of output ends (T1, T2). The capacitor C1 has a capacitance capable of supplying energy for continuing the operation of the second control circuit 44b for a predetermined time or longer to the control power supply circuit CP1 when the input of AC power to the first conversion circuit 43c is stopped. It is preferable to do so. According to the fifth aspect, for example, in the event of a power failure, the second control circuit 44b can quickly stop the first conversion circuit 43c and the second conversion circuit 44a, thereby suppressing power consumption (consumption of the control voltage Vcc). be able to. Further, for example, when the wall switch (switch SW0) is temporarily turned off during one-two operation, the second control circuit 44b can continue to operate for at least a predetermined time or longer.

Regarding the power supply device 42 according to the sixth aspect, in the third or fourth aspect, the second control circuit 44b is a control power for supplying power from the first DC power passing through the filter circuit 440a to the first control circuit 43d. It is preferable to have a control power supply circuit CP1 for generating the above. The first conversion circuit 43c preferably has a first capacitor (capacitor C1) connected between the pair of output ends (T1, T2). The filter circuit 440a preferably has at least a second capacitor (capacitor C2). The total capacitance of the capacitor C1 and the capacitor C2 gives the control power supply circuit CP1 energy for continuing the operation of the second control circuit 44b for a predetermined time or longer when the input of AC power to the first conversion circuit 43c is stopped. It is preferably a capacitance that can be supplied. According to the sixth aspect, for example, in the event of a power failure, the second control circuit 44b can quickly stop the first conversion circuit 43c and the second conversion circuit 44a, thereby suppressing power consumption (consumption of the control voltage Vcc). be able to. Further, for example, when the wall switch (switch SW0) is temporarily turned off during one-two operation, the second control circuit 44b can continue to operate for at least a predetermined time or longer.

The power supply device 42 according to the seventh aspect preferably further includes a first electric wire L11, a second electric wire L12, and a third electric wire L13 in any one of the first to sixth aspects. It is preferable that the output ends (T1, T2) of the first conversion circuit 43c and the input ends (T3, T4) of the second conversion circuit 44a are electrically connected to each other via the first electric wire L11. The second control circuit 44b preferably monitors AC power via the second electric wire L12. It is preferable that the second control circuit 44b supplies power to the first control circuit 43d via the third electric wire L13. According to the seventh aspect, the degree of freedom in the distance between the first substrate 431 and the second substrate 441 is increased as compared with the case where the first substrate 431 and the second substrate 441 are directly connected by, for example, an inter-board connector. Can be done.

The lighting device 2 according to the eighth aspect includes a power supply device 42 in any one of the first to seventh aspects, and a solid-state light source (LED elements 52, 53) as a load. According to the eighth aspect, it is possible to provide the lighting device 2 provided with the power supply device 42 capable of increasing the degree of freedom of arrangement while maintaining the reliability of operation.

The control method according to the ninth aspect is to convert the input AC power into the first DC power by the first conversion circuit 43c in which the circuit component (first circuit component 432) is mounted on the first board 431. To be equipped. Further, as a control method, the first DC power is set to a voltage level different from the voltage level of the first DC power by the second conversion circuit 44a in which the circuit component (second circuit component 442) is mounted on the second board 441. 2 It is provided that it is converted into DC power and supplied to a load (LED elements 52, 53). Further, the control method is to monitor the AC power input to the first conversion circuit 43c, and to control the first conversion circuit 43c only when the AC power is input to the first conversion circuit 43c (No. 1). 1 Control circuit 43d) is provided with power supply. According to the ninth aspect, the degree of freedom of arrangement can be increased while maintaining the reliability of operation.

2 Lighting device 42 Power supply device 43c 1st conversion circuit 43d 1st control circuit 431 1st board 432 1st circuit part 44a 2nd conversion circuit 44b 2nd control circuit 441 2nd board 442 2nd circuit part 440a Filter circuit 52, 53 LED element (load)
T1, T2 Output end T3, T4 Input end CP1 Control power supply circuit C1 capacitor (first capacitor)
C2 capacitor (second capacitor)
L11 1st electric wire L12 2nd electric wire L13 3rd electric wire

Claims (9)

The first conversion circuit that converts the input AC power into the first DC power,
The first control circuit that controls the first conversion circuit and
A second conversion circuit that converts the first DC power into a second DC power having a voltage level different from the voltage level of the first DC power and supplies the load.
The second control circuit that controls the second conversion circuit and
A first substrate having a plurality of first circuit part constituting the first conversion circuit and the first control circuit is mounted,
A second board on which a plurality of second circuit components constituting the second conversion circuit and the second control circuit are mounted, and
With
The output end of the first conversion circuit and the input end of the second conversion circuit are electrically connected to each other.
The first control circuit is electrically connected to the second control circuit, and power is supplied from the second control circuit to control the first conversion circuit.
The second control circuit is configured to monitor the input AC power.
The power supply device is characterized in that the second control circuit is configured to supply power to the first control circuit only when the AC power is input to the first conversion circuit. The power supply device according to claim 1, wherein the second control circuit determines that the AC power is input to the first conversion circuit by periodically zero-crossing the AC voltage. The power supply device according to claim 1 or 2, wherein the second conversion circuit includes a filter circuit for attenuating harmonic components as a front-stage circuit. The filter circuit is characterized by having a cutoff frequency that is at least twice the frequency of the AC voltage and at least the minimum value of the oscillation frequency of the first conversion circuit or the second conversion circuit. The power supply device according to claim 3. The second control circuit includes a control power supply circuit that generates control power for supplying power to the first control circuit from the first DC power input to the input terminal.
The first conversion circuit has a pair of capacitors connected between the output ends.
The capacitor has a capacitance capable of supplying the control power supply circuit with energy for continuing the operation of the second control circuit for a predetermined time or longer when the input of the AC power to the first conversion circuit is stopped. The power supply device according to any one of claims 1 to 4, wherein the power supply device has. The second control circuit includes a control power supply circuit that generates control power for supplying power to the first control circuit from the first DC power that has passed through the filter circuit.
The first conversion circuit has a first capacitor connected between the pair of output ends.
The filter circuit has at least a second capacitor and
The total capacitance of the first capacitor and the second capacitor provides energy for continuing the operation of the second control circuit for a predetermined time or longer when the input of the AC power to the first conversion circuit is stopped. The power supply device according to claim 3 or 4, wherein the capacitance is a capacitance that can be supplied to the control power supply circuit. Further equipped with a first electric wire, a second electric wire, and a third electric wire,
The output end of the first conversion circuit and the input end of the second conversion circuit are electrically connected to each other via the first electric wire.
The second control circuit monitors the AC power via the second electric wire.
The power supply device according to any one of claims 1 to 6, wherein the second control circuit supplies power to the first control circuit via the third electric wire. A lighting device comprising the power supply device according to any one of claims 1 to 7 and a solid-state light source as the load. Converting the input AC power to the first DC power by the first conversion circuit in which the circuit components are mounted on the first board.
A second conversion circuit in which circuit components are mounted on a second board converts the first DC power into a second DC power having a voltage level different from the voltage level of the first DC power and supplies the load.
Monitoring the AC power input to the first conversion circuit by a second control circuit in which a circuit component is mounted on the second board and controls the second conversion circuit.
By the second control circuit, power is supplied to the first control circuit that controls the first conversion circuit only when the AC power is input to the first conversion circuit.
A control method characterized by comprising.

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