Power supply device, lighting apparatus, and board unit

Abstract

To provide a power supply device, a lighting apparatus, and a board unit, capable of suppressing a noise output to an external part while suppressing deterioration of designability and variations of a noise suppression effect.SOLUTION: A power supply device comprises: a board unit having a substrate and a magnetic core attached to the substrate; a pair of output terminal parts that is provided to the substrate, and is used for a connection with a light source unit; and a switching circuit that is provided to the substrate, includes a switching element, converts a power to be input into a power corresponding to a light source unit by a switching of the switching element, supplies the power after the conversion to the pair of output terminal parts, and turns on the light source unit connected to the pair of output terminal parts. The magnetic core includes a penetration hole, and is attached to the substrate so that one part of a wiring path of the substrate is inserted into the penetration hole, and thus, a noise output from the substrate to an external part can be suppressed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] SUMMARY OF THE PRESENT EMBODIMENTS An embodiment of the present invention relates to a power supply device, a lighting fixture, and a board unit. [Background technology]

[0002] There is a lighting fixture that includes a light source unit and a power supply device for lighting the light source unit. The power supply device is connected to the power source and the light source unit via wiring or the like, converts power input from the power source into power suitable for the light source unit, and supplies the converted power to the light source unit, thereby lighting the light source unit. The power supply device has a switching circuit. The switching circuit has a switching element, and performs power conversion by switching the switching element.

[0003] A switching circuit can be a noise source. For this reason, it is required for the power supply device to suppress the noise output to the outside. In other words, it is required to suppress the noise output from the power supply device to the power supply side and the light source unit side.

[0004] For example, it is conceivable to suppress noise propagating from the power supply device to the light source unit by attaching a magnetic core such as a ferrite core to the wiring connecting the power supply device and the light source unit.

[0005] However, in this case, there is a concern that the magnetic core will be exposed to the outside, which will impair the design of the lighting fixture. In addition, in a configuration in which the magnetic core is attached to external wiring, there is a possibility that the position at which the magnetic core is attached will vary, which will also cause variation in the noise suppression effect. Furthermore, if the magnetic core is exposed to the outside, there is a concern that the magnetic core will crack or break due to impact, etc.

[0006] For this reason, it is desirable for power supply devices and lighting fixtures to be able to suppress noise output to the outside while minimizing degradation of design and variation in noise suppression effect. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2023-27447 A Summary of the Invention [Problem to be solved by the invention]

[0008] The objective is to provide a power supply device, a lighting fixture, and a board unit that can suppress noise output to the outside while suppressing deterioration of design and variation in noise suppression effect. [Means for solving the problem]

[0009] According to an embodiment of the present invention, there is provided a power supply device comprising: a substrate unit having a substrate and a magnetic core attached to the substrate; a pair of output terminal portions provided on the substrate and used for connecting to a light source unit; and a switching circuit provided on the substrate, having a switching element, which converts input power into power corresponding to the light source unit by switching the switching element and supplies the converted power to the pair of output terminal portions, thereby lighting the light source unit connected to the pair of output terminal portions, wherein the magnetic core has a through hole and is attached to the substrate so that a portion of the wiring path of the substrate is inserted into the through hole, thereby suppressing noise output from the substrate to the outside. Effect of the Invention

[0010] According to the embodiments of the present invention, it is possible to provide a power supply device, a lighting fixture, and a board unit that can suppress noise output to the outside while suppressing degradation of design and variation in noise suppression effect. [Brief description of the drawings]

[0011] [Figure 1]1 is a block diagram illustrating a lighting device according to an embodiment of the present invention; [Diagram 2] FIG. 1 is a block diagram illustrating a switching circuit according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a perspective view illustrating a schematic view of a portion of a board unit according to the embodiment. [Figure 4] FIG. 2 is a cross-sectional view illustrating a schematic view of a portion of a substrate unit according to the embodiment. [Diagram 5] FIG. 2 is an explanatory diagram illustrating a schematic view of a portion of a board unit according to the embodiment. [Figure 6] 13 is a plan view illustrating a schematic modification of a portion of the board unit according to the embodiment. FIG. [Figure 7] 13 is a plan view illustrating a schematic modification of a portion of the board unit according to the embodiment. FIG. [Figure 8] 13 is a plan view illustrating a schematic modification of a portion of the board unit according to the embodiment. FIG. [Figure 9] 13 is a plan view illustrating a schematic modification of a portion of the board unit according to the embodiment. FIG. [Figure 10] FIG. 13 is a perspective view illustrating a modified example of a portion of the board unit according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Each embodiment will be described below with reference to the drawings. The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the size ratio between parts, etc. are not necessarily the same as in reality. Even when the same part is shown, the dimensions and ratios of each part may be different depending on the drawing. In this specification and each drawing, elements similar to those described above with reference to the previous drawings are given the same reference numerals and detailed descriptions thereof will be omitted as appropriate.

[0013] FIG. 1 is a block diagram illustrating a lighting device according to an embodiment. As shown in FIG. 1, the lighting fixture 2 includes a light source unit 4 and a power supply device 10.

[0014] The light source unit 4 has a light source 4a. The light source unit 4 is connected to the power supply device 10 via wiring or the like, and receives a supply of power from the power supply device 10 to emit light from the light source 4a. The lighting fixture 2 is attached to, for example, a ceiling in a room, and illuminates a space such as a room by emitting light from the light source unit 4 (light source 4a). However, the installation position of the lighting fixture 2 is not limited to the ceiling in a room, and may be any position. The space illuminated by the lighting fixture 2 may be any space.

[0015] The light source 4a is, for example, a light emitting diode (LED). In other words, the light source unit 4 is an LED unit (LED module). However, the light source 4a may be, for example, an organic light emitting diode (OLED), an inorganic electroluminescence light emitting element, an organic electroluminescence light emitting element, or other electroluminescence type light emitting element. The light source 4a may be, for example, a light bulb. The light source 4a may be any light source that irradiates light in response to the supply of power. The number of light sources 4a provided in the light source unit 4 is not limited to one. The light source unit 4 may have, for example, a plurality of light sources 4a connected in series or in parallel.

[0016] The power supply device 10 includes a board unit 12, a pair of input terminal units 14a and 14b, a pair of output terminal units 16a and 16b, a conversion circuit 18, a switching circuit 20, and a control circuit 22.

[0017] The board unit 12 has a board 30 and a magnetic core 32. The board 30 has a wiring pattern. In other words, the board 30 is a printed wiring board. The magnetic core 32 is attached to the board 30. The magnetic core 32 has a through hole 32a, and by inserting a part of the wiring path of the board 30 into the through hole 32a, noise output from the board 30 to the outside is suppressed. More specifically, the magnetic core 32 suppresses noise superimposed on the power or electric signal output from the board 30 to the outside.

[0018] The magnetic core 32 is, for example, a cylindrical ferrite core. However, the magnetic core 32 may be, for example, a ring-shaped toroidal core. The material of the magnetic core 32 is not limited to ferrite, and may be other magnetic materials such as carbonyl iron. The magnetic core 32 is not limited to the above, and may be any element that can suppress noise output from the substrate 30 to the outside by inserting a part of the wiring path of the substrate 30 into the through hole 32a.

[0019] The pair of input terminal portions 14a, 14b are provided on the substrate 30. The pair of input terminal portions 14a, 14b are, for example, mounted on the substrate 30 and electrically connected to a wiring pattern provided on the substrate 30. However, the pair of input terminal portions 14a, 14b may also be electrically connected to the substrate 30 via, for example, wiring or the like.

[0020] The pair of input terminals 14a, 14b are used for connection to the power source PS. The pair of input terminals 14a, 14b are, for example, a connector or a terminal block. The power supply device 10 is connected to the power source PS via the pair of input terminals 14a, 14b. The power supply device 10 is, for example, detachably connected to the power source PS via the pair of input terminals 14a, 14b. The power supplied by the power source PS is, for example, AC power. The power source PS is, for example, a commercial power source. The power source PS may be a private generator or the like. However, the power supplied by the power source PS is not limited to AC power, and may be DC power or the like. The power supplied by the power source PS may be any power.

[0021] The pair of output terminal portions 16a, 16b are provided on the substrate 30. The pair of output terminal portions 16a, 16b, like the pair of input terminal portions 14a, 14b, are mounted on the substrate 30, for example, and electrically connected to a wiring pattern provided on the substrate 30. However, the pair of output terminal portions 16a, 16b may also be electrically connected to the substrate 30 via, for example, wiring or the like.

[0022] The pair of output terminals 16a, 16b are used for connection to the light source unit 4. The pair of output terminals 16a, 16b are, for example, a connector or a terminal block. The power supply device 10 is connected to the light source unit 4 via the pair of output terminals 16a, 16b. The power supply device 10 is, for example, detachably connected to the light source unit 4 via the pair of output terminals 16a, 16b. However, the light source unit 4 does not necessarily have to be configured to be detachably connected to the power supply device 10. The light source unit 4 may be, for example, provided integrally with the power supply device 10.

[0023] The conversion circuit 18 is provided on the substrate 30. The conversion circuit 18 is mounted on the substrate 30 and connected to the pair of input terminal units 14a, 14b via the wiring pattern of the substrate 30. The conversion circuit 18 is connected to the power source PS via the pair of input terminal units 14a, 14b, and converts AC power supplied from the power source PS into DC power. The conversion circuit 18 is, for example, an AC-DC conversion circuit.

[0024] The conversion circuit 18 has, for example, a rectifier circuit that rectifies AC power supplied from the power source PS, and a converter that converts the power rectified by the rectifier circuit into DC power. The converter has a switching element and converts the rectified power into DC power by switching the switching element. More specifically, the converter is a boost converter that converts the rectified power into DC power of an arbitrary voltage level. In other words, the converter is a power factor improvement circuit that brings the power factor on the power source PS side closer to 1.

[0025] The conversion circuit 18 inputs the converted DC power to the switching circuit 20. For example, when the power supplied from the power source PS is DC power, the conversion circuit 18 may be omitted. The power supplied from the power source PS may be input to the switching circuit 20 as is.

[0026] The switching circuit 20 is provided on the substrate 30. The switching circuit 20 is mounted on the substrate 30 and connected to the conversion circuit 18 and the pair of output terminal portions 16a, 16b via the wiring pattern of the substrate 30. The switching circuit 20 converts input power into power corresponding to the light source unit 4 and supplies the converted power to the pair of output terminal portions 16a, 16b, thereby lighting up the light source unit 4 connected to the pair of output terminal portions 16a, 16b.

[0027] The switching circuit 20 is, for example, a DC-DC conversion circuit that converts the DC power supplied from the conversion circuit 18 into DC power having a voltage magnitude corresponding to the light source unit 4. The switching circuit 20 is, for example, a step-down converter that steps down the DC power boosted by the conversion circuit 18 to DC power having a voltage magnitude corresponding to the light source unit 4. The switching circuit 20 may have a dimming function that changes the brightness of the light irradiated from the light source unit 4 by changing the voltage magnitude in response to a dimming signal input from the outside, for example.

[0028] When the power supplied from the switching circuit 20 to the pair of output terminals 16a, 16b is DC power, the output terminal 16a is a high-potential output terminal, and the output terminal 16b is a low-potential output terminal. The potential of the output terminal 16b is, for example, a reference potential (ground potential).

[0029] However, the power supplied from the switching circuit 20 to the light source unit 4 is not limited to DC power and may be AC ​​power, etc. The switching circuit 20 may have any configuration capable of converting input power into power suitable for the light source unit 4.

[0030] The control circuit 22 controls the operation of the conversion circuit 18 and the switching circuit 20. The control circuit 22 controls the conversion of AC power to DC power by the conversion circuit 18, and also controls the conversion of DC power to another DC power by the switching circuit 20.

[0031] The control circuit 22 is provided, for example, on a substrate 30. The control circuit 22 is connected to the conversion circuit 18 and the switching circuit 20, for example, via a wiring pattern on the substrate 30. However, the control circuit 22 does not necessarily have to be provided on the substrate 30 on which the conversion circuit 18 and the switching circuit 20 are provided. The control circuit 22 may be provided, for example, on a substrate separate from the substrate 30, and electrically connected to the conversion circuit 18 and the switching circuit 20.

[0032] 1, the magnetic core 32 is provided, for example, between the switching circuit 20 and the pair of output terminals 16a, 16b. The magnetic core 32 is attached to the substrate 30 such that, for example, two wires electrically connecting the switching circuit 20 and the pair of output terminals 16a, 16b among the wiring paths of the substrate 30 are inserted into the through-hole 32a. In this way, the magnetic core 32 suppresses noise superimposed on the power output from the switching circuit 20 to the output terminals 16a, 16b. In other words, the magnetic core 32 suppresses noise superimposed on the power output from the substrate 30 to the light source unit 4.

[0033] In addition, the wiring inserted into the through hole 32a of the magnetic core 32 may be, for example, a single wiring that electrically connects the switching circuit 20 and the output terminal portion 16a, or a single wiring that electrically connects the switching circuit 20 and the output terminal portion 16b.

[0034] The power supply device 10 further includes, for example, a housing 24. The housing 24 houses therein the board 30 and each of the components provided on the board 30, such as the input terminal units 14a, 14b, the output terminal units 16a, 16b, the conversion circuit 18, the switching circuit 20, the control circuit 22, and the magnetic core 32. In other words, the housing 24 covers the periphery of each component such as the board unit 12.

[0035] The housing 24 has, for example, four openings, and at least a part of the input terminal units 14a, 14b and the output terminal units 16a, 16b are exposed to the outside from each of the four openings. In this way, the housing 24 covers the periphery of each unit, while enabling connection (wiring) between the input terminal units 14a, 14b and the power source PS, and connection between the output terminal units 16a, 16b and the light source unit 4.

[0036] The housing 24 is made of a metal material such as aluminum. The housing 24 is conductive. The housing 24 is electrically connected to the wiring pattern of the substrate 30 so as to have the same potential as the reference potential (ground potential) of the substrate 30. By covering each part with the housing 24 and setting the housing 24 to the reference potential in this manner, it is possible to suppress radiation noise emitted from the power supply device 10 to the outside.

[0037] FIG. 2 is a block diagram illustrating a switching circuit according to the embodiment. 2, the switching circuit 20 has a first input terminal 20a, a second input terminal 20b, a first output terminal 20c, and a second output terminal 20d. The first input terminal 20a is electrically connected to a high potential side output terminal of the conversion circuit 18. The second input terminal 20b is electrically connected to a low potential side output terminal of the conversion circuit 18. This allows power to be input from the conversion circuit 18 to the switching circuit 20. In this example, DC power is input from the conversion circuit 18 to the switching circuit 20.

[0038] The first input terminal 20a is the high potential input terminal of a pair of input terminals that receive input of DC power. The second input terminal 20b is the low potential input terminal of a pair of input terminals that receive input of DC power. The first input terminal 20a may be electrically connected to, for example, the input terminal unit 14a. The second input terminal 20b may be electrically connected to, for example, the input terminal unit 14b.

[0039] The switching circuit 20 includes a switching element 40 , a diode 42 , and an inductor 44 .

[0040] The switching element 40 has a first main terminal 40a, a second main terminal 40b, and a control terminal 40c. The first main terminal 40a is electrically connected to the first input terminal 20a. The second main terminal 40b is electrically connected to the cathode of the diode 42.

[0041] The switching element 40 is, for example, an n-channel FET. For example, the first main terminal 40a is a drain, the second main terminal 40b is a source, and the control terminal 40c is a gate. The switching element 40 may be, for example, a p-channel FET or a bipolar transistor.

[0042] The anode of the diode 42 is electrically connected to the second input terminal 20b. The diode 42 is, for example, a freewheeling diode. One end of the inductor 44 is electrically connected to the second main terminal 40b. More specifically, one end of the inductor 44 is electrically connected to a connection point between the second main terminal 40b and the cathode of the diode 42. The other end of the inductor 44 is electrically connected to the first output terminal 20c. The second output terminal 20d is electrically connected to the second input terminal 20b.

[0043] The switching circuit 20 is a step-down chopper circuit. The switching circuit 20 converts the input DC power into another DC power corresponding to the light source unit 4 by stepping down the voltage of the DC power input from the conversion circuit 18 by switching the switching element 40. The switching circuit 20 is, for example, a constant current circuit. The switching circuit 20 supplies, for example, a substantially constant DC current to the light source unit 4 (light source 4a).

[0044] The first output terminal 20c is a high-potential output terminal, and the second output terminal 20d is a low-potential output terminal The potential of the first output terminal 20c is higher than the potential of the second output terminal 20d.

[0045] The switching circuit 20 is electrically connected to a pair of output terminals 16a, 16b via a first output terminal 20c and a second output terminal 20d. The first output terminal 20c is electrically connected to the output terminal 16a. The second output terminal 20d is electrically connected to the output terminal 16b. In other words, the switching circuit 20 is electrically connected to the light source unit 4 via the first output terminal 20c and the second output terminal 20d. For example, when the light source 4a of the light source unit 4 is an LED, the first output terminal 20c is connected to the anode of the light source 4a, and the second output terminal 20d is connected to the cathode of the light source 4a. As a result, the light source 4a is turned on by the DC power output from the first output terminal 20c and the second output terminal 20d.

[0046] The power supply device 10 further includes, for example, an output capacitor 46. The output capacitor 46 has a first electrode 46a and a second electrode 46b. The first electrode 46a is electrically connected to the first output terminal 20c. The second electrode 46b is electrically connected to the second output terminal 20d. The output capacitor 46 is connected in parallel between the first output terminal 20c and the second output terminal 20d. The potential of the first electrode 46a is set higher than the potential of the second electrode 46b. The first electrode 46a is, for example, an anode, and the second electrode 46b is, for example, a cathode.

[0047] The output capacitor 46 smoothes the current flowing between the first main terminal 40a and the second main terminal 40b of the switching element 40 by switching of the switching element 40. This makes it possible to suppress fluctuations in the current of the DC power supplied from the switching circuit 20 to the light source unit 4.

[0048] The magnetic core 32 is attached to the substrate 30 so that, for example, two wires of the wiring path of the substrate 30, namely, a wire electrically connecting the first output terminal 20c of the switching circuit 20 and the output terminal portion 16a, and a wire electrically connecting the second output terminal 20d of the switching circuit 20 and the output terminal portion 16b, are inserted into the through hole 32a.

[0049] The control circuit 22 is electrically connected to the control terminal 40c of the switching element 40. The control circuit 22 controls the switching of the switching element 40. That is, the control circuit 22 switches the switching element 40 on and off. The control circuit 22 switches the switching element 40 on and off by a voltage (drive signal) input to the control terminal 40c. In this way, the control circuit 22 is connected to the control terminal 40c of the switching element 40, and controls the conversion of power by the switching circuit 20 by controlling the switching of the switching element 40. As a result, DC power is supplied from the switching circuit 20 to the light source unit 4. In other words, the switching circuit 20 converts the input power into power corresponding to the light source unit 4 by switching the switching element 40.

[0050] The control circuit 22 stops the supply of DC power from the switching circuit 20 to the light source unit 4, for example, by turning off the switching element 40. In addition, the control circuit 22 can change the voltage value and current value of the DC power supplied to the light source unit 4, for example, by changing the on / off cycle (duty ratio) of the switching element 40. This makes it possible to change, for example, the brightness of the light irradiated from the light source 4a.

[0051] The configuration of the switching circuit 20 is not limited to the above circuit. The switching circuit 20 may be any circuit that has at least a switching element 40 and can convert input power into power corresponding to the light source unit 4 by switching the switching element 40.

[0052] FIG. 3 is a perspective view that illustrates a schematic view of a portion of the board unit according to the embodiment. FIG. 4 is a cross-sectional view that illustrates a schematic view of a portion of the substrate unit according to the embodiment. FIG. 4 is a schematic cross-sectional view taken along line A1-A2 in FIG. 3 and 4, the substrate 30 has a substrate body 50 and a pair of openings 51, 52 provided in the substrate body 50. The pair of openings 51, 52 are provided side by side at a predetermined interval in the substrate body 50. The substrate body 50 has a thin plate-shaped portion 50a provided between the pair of openings 51, 52. In other words, the portion 50a of the substrate body 50 is provided adjacent to each of the pair of openings 51, 52.

[0053] 3 and 4, the magnetic core 32 is attached to a pair of openings 51, 52 of the substrate 30 with a portion 50a of the substrate body 50 inserted into the through hole 32a. The magnetic core 32 has, for example, a pair of semi-cylindrical core bodies 61, 62 and a case 63. In other words, the core bodies 61, 62 are split cores obtained by splitting a cylindrical core (for example, a ferrite core) into two. The pair of core bodies 61, 62 are fitted together in a cylindrical shape to form a cylindrical magnetic core.

[0054] The case 63 has a holding state in which the pair of core bodies 61, 62 are held in a cylindrically aligned state, and a release state in which the holding of the pair of core bodies 61, 62 is released. The case 63 has, for example, two semi-cylindrical members rotatably connected via a hinge. The case 63 is in the holding state by, for example, engaging an engagement portion provided at the end of the two semi-cylindrical members opposite the hinge, and is in the release state by releasing the engagement portion. The shape of the case 63 in the holding state is, for example, a cylindrical shape that covers the outside of the pair of core bodies 61, 62. The case 63 may also be called, for example, a clamp. However, the configuration of the case 63 is not limited to the above, and may be any configuration that can switch between the holding state and the release state.

[0055] In the released state, the case 63 enables the pair of core bodies 61, 62 to be attached to a wiring material or the like. In this example, by setting the case 63 to the released state, the pair of core bodies 61, 62 can be attached to the part 50a of the substrate body 50. As a result, for example, as shown in Fig. 4, the magnetic core 32 is attached to the pair of openings 51, 52 in a state in which one core body 61 is inserted into one opening 51, the other core body 62 is inserted into the other opening 52, and the part 50a of the substrate body 50 is inserted into the through hole 32a.

[0056] The shape of each of the part 50a of the substrate body 50 and the openings 51 and 52 is set according to the shape of the magnetic core 32. The width of the part 50a of the substrate body 50 is set according to, for example, the diameter of the through hole 32a (the inner diameter of the pair of core bodies 61 and 62). The width of the part 50a of the substrate body 50 is set, for example, to be slightly smaller than the diameter of the through hole 32a. The length of the part 50a of the substrate body 50 is set, for example, according to the length of the magnetic core 32. The length of the part 50a of the substrate body 50 is set, for example, to be slightly longer than the length of the magnetic core 32. The size of the openings 51 and 52 is set, for example, according to the outer diameter ... to be slightly larger than the outer diameter of the magnetic core 32. As a result, in this example, the magnetic core 32 is held on the substrate 30 by putting the case 63 into a holding state.

[0057] FIG. 5 is an explanatory diagram that illustrates a schematic view of a portion of the board unit according to the embodiment. 5, in the substrate 30, parts 53 and 54 of the wiring patterns are provided on a part 50a of the substrate body 50. For convenience, the magnetic core 32 is shown in cross section in FIG.

[0058] The portions 53 and 54 of the wiring pattern are, for example, at least a portion of two wires (patterns) among the wiring patterns provided on the substrate 30, which electrically connect the switching circuit 20 (the first output terminal 20c and the second output terminal 20d) to a pair of output terminal portions 16a and 16b.

[0059] With this, by attaching the magnetic core 32 to the pair of openings 51, 52 of the substrate 30 with the portion 50a of the substrate body 50 inserted into the through hole 32a, the magnetic core 32 is attached to the substrate 30 with a portion of the wiring path of the substrate 30 inserted into the through hole 32a, thereby making it possible to suppress noise output from the substrate 30 to the outside. Thus, in this example, the portion of the wiring path of the substrate 30 inserted into the through hole 32a is the portion 53, 54 of the wiring pattern provided on the portion 50a of the substrate body 50.

[0060] 5, the wiring pattern portions 53 and 54 are configured so that the number of turns around the magnetic core 32 can be changed. The wiring pattern portion 53 has, for example, terminal portions 53a to 53d. The wiring pattern portion 54 has, for example, terminal portions 54a to 54d. The terminal portions 53a to 53d and 54a to 54d are, in other words, pads provided on the surface of the substrate body 50.

[0061] Part 53 of the wiring pattern is provided in a spiral shape around opening 51. Part 53 of the wiring pattern is partially interrupted between terminal portion 53c and terminal portion 53d. Similarly, part 54 of the wiring pattern is provided in a spiral shape around opening 52. Part 54 of the wiring pattern is partially interrupted between terminal portion 54c and terminal portion 54d.

[0062] The terminal portions 53a and 54a are arranged on a path that sets the number of turns for the magnetic core 32 to 1 turn. The terminal portions 53b and 54b are arranged on a path that sets the number of turns for the magnetic core 32 to 2 turns. The terminal portions 53c and 54c are arranged on a path that sets the number of turns for the magnetic core 32 to 3 turns.

[0063] The terminals 53a to 53c and 54a to 54c are, for example, electrically connected to the switching circuit 20 and one of the output terminals 16a and 16b. The terminals 53d and 54d are, for example, electrically insulated from the terminals 53a to 53c and 54a to 54c and are electrically connected to the switching circuit 20 and the other of the output terminals 16a and 16b.

[0064] As a result, in some of the wiring patterns 53 and 54, the number of turns for the magnetic core 32 can be set to 1 turn by electrically connecting the terminal portion 53a and the terminal portion 53d via a wiring material (e.g., a jumper wire) and electrically connecting the terminal portion 54a and the terminal portion 54d via a wiring material. The number of turns for the magnetic core 32 can be set to 2 turns by electrically connecting the terminal portion 53b and the terminal portion 53d via a wiring material and electrically connecting the terminal portion 54b and the terminal portion 54d via a wiring material. Then, the number of turns for the magnetic core 32 can be set to 3 turns by electrically connecting the terminal portion 53c and the terminal portion 53d via a wiring material and electrically connecting the terminal portion 54c and the terminal portion 54d via a wiring material.

[0065] However, in the parts 53 and 54 of the wiring patterns, the configuration for making the number of turns around the magnetic core 32 variable is not limited to the above, and any configuration that can appropriately change the number of turns may be used. Also, the number of turns that can be changed is not limited to 1 to 3 turns, and may be 4 turns or more. The number of turns that can be changed may be any number of turns.

[0066] As described above, in the lighting fixture 2, power supply device 10, and board unit 12 according to the present embodiment, the board unit 12 has a board 30 and a magnetic core 32. The magnetic core 32 has a through hole 32a, and is attached to the board 30 such that a part of the wiring path of the board 30 is inserted through the through hole 32a, thereby suppressing noise output from the board 30 to the outside.

[0067] In this manner, in the lighting fixture 2, the power supply device 10, and the board unit 12 according to the present embodiment, the magnetic core 32 is attached to the board 30 covered by the housing 24. This prevents the magnetic core 32 from being exposed to the outside, which would impair the design of the lighting fixture 2. In addition, it is possible to prevent the magnetic core 32 from being attached to an external wiring or the like, which would cause variation in the position at which the magnetic core 32 is attached, which would cause variation in the noise suppression effect. In addition, by attaching the magnetic core 32 to the board 30, the magnetic core 32 is disposed near a noise source such as the switching circuit 20, and the noise suppression effect can be further improved compared to a configuration in which the magnetic core 32 is attached to an external wiring or the like. Furthermore, by attaching the magnetic core 32 to the board 30 covered by the housing 24, it is possible to prevent the magnetic core 32 from cracking or breaking due to an impact, which would cause variation in the magnetic core 32 due to an impact, which would cause variation in the position at which the magnetic core 32 is attached, which would cause variation in the noise suppression effect, as in a configuration in which the magnetic core 32 is attached to an external wiring or the like.

[0068] Therefore, the lighting fixture 2, power supply device 10, and board unit 12 according to this embodiment can suppress noise output to the outside while suppressing degradation of design and variation in the noise suppression effect.

[0069] In the lighting fixture 2, power supply device 10, and board unit 12 according to this embodiment, the magnetic core 32 is attached to the board 30 with a portion 50a of the board body 50 inserted into the through hole 32a. This makes it easier to attach the magnetic core 32 to the board 30 without requiring any member for attaching the magnetic core 32 to the board 30.

[0070] In the lighting fixture 2, power supply device 10, and board unit 12 according to this embodiment, the board 30 has parts 53 and 54 of the wiring patterns as parts of the wiring path that are inserted into the through hole 32a. This makes it possible to insert part of the wiring path into the through hole 32a simply by inserting part 50a of the board main body 50 into the through hole 32a, making it easier to attach the magnetic core 32 to the board 30.

[0071] In the lighting fixture 2, power supply device 10, and board unit 12 according to this embodiment, the parts 53 and 54 of the wiring patterns are configured to be able to change the number of turns around the magnetic core 32. This makes it possible to easily select the optimal number of turns according to the frequency band of the noise output from the board 30 to the outside, even when the parts 53 and 54 of the wiring patterns are used as part of the wiring path inserted into the through hole 32a. This makes it possible to more appropriately suppress the noise output from the board 30 to the outside.

[0072] In the lighting fixture 2, power supply unit 10, and board unit 12 of this embodiment, the magnetic core 32 is attached to the board 30 so that two wires in the wiring path of the board 30 that electrically connect the switching circuit 20 and the pair of output terminal portions 16a, 16b are inserted into the through hole 32a.

[0073] The switching circuit 20 can be a noise source for the power supply device 10. In the switching circuit 20, noise may be generated due to switching of the switching element 40. The noise generated in the switching circuit 20 may be emitted from the power supply device 10 to the outside as radiation noise, and may also propagate to the light source unit 4 via the output terminals 16a, 16b and wiring, and may be emitted from the light source unit 4 to the outside as radiation noise.

[0074] By attaching the magnetic core 32 to the substrate 30 so that two wires electrically connecting the switching circuit 20 and the pair of output terminals 16a, 16b are inserted into the through hole 32a, it is possible to suppress noise propagating from the power supply device 10 to the light source unit 4. This makes it possible to suppress the radiation noise emitted from the entire lighting fixture 2.

[0075] The radiated noise emitted from the lighting fixture 2 is measured, for example, by a measurement method specified in a radiated electric field strength standard such as CISPRJ 15. In the lighting fixture 2, power supply device 10, and board unit 12 according to this embodiment, for example, the radiated noise measured by a measurement method specified in the radiated electric field strength standard can be suppressed to a level lower than that specified in the radiated electric field strength standard. In the lighting fixture 2, power supply device 10, and board unit 12 according to this embodiment, it is possible to make the lighting fixture 2 more easily compliant with the radiated electric field strength standard.

[0076] Note that the part of the wiring path of the substrate 30 inserted into the magnetic core 32 is not limited to the two wires electrically connecting the switching circuit 20 and the pair of output terminals 16a, 16b. The part of the wiring path of the substrate 30 inserted into the magnetic core 32 may be, for example, two wires electrically connecting the conversion circuit 18 and the pair of input terminals 14a, 14b. The magnetic core 32 may suppress, for example, noise propagating from the power supply device 10 to the power supply PS. The part of the wiring path of the substrate 30 inserted into the magnetic core 32 is not limited to the above and may be any part of the wiring path of the substrate 30.

[0077] FIG. 6 is a plan view that illustrates a modified example of a portion of the board unit according to the embodiment. 6, in this example, the opening 51 provided in the substrate body 50 is replaced with a notch 55. In this example, the portion 50a of the substrate body 50 is a thin plate-like portion provided between the opening 52 and the notch 55. In other words, the portion 50a of the substrate body 50 is provided adjacent to each of the opening 52 and the notch 55.

[0078] FIG. 7 is a plan view illustrating a schematic modification of a portion of the board unit according to the embodiment. 7, in this example, openings 51, 52 provided in substrate body 50 are replaced with notches 56, 57, respectively. In this example, portion 50a of substrate body 50 is a thin plate-like portion provided between notches 56 and 57. In other words, portion 50a of substrate body 50 is provided adjacent to each of the pair of notches 56, 57.

[0079] FIG. 8 is a plan view that illustrates a modified example of a portion of the board unit according to the embodiment. 8, in this example, the opening 51 provided in the substrate body 50 is omitted. In this example, the portion 50a of the substrate body 50 is a thin plate-like portion provided between the outer edge 50b of the substrate body 50 and the opening 52. In other words, the portion 50a of the substrate body 50 is provided adjacent to each of the outer edge 50b of the substrate body 50 and the opening 52.

[0080] FIG. 9 is a plan view illustrating a schematic modification of a portion of the board unit according to the embodiment. 9, in this example, the portion 50a of the substrate body 50 is a thin plate-like portion provided between the outer edge 50b of the substrate body 50 and the cutout portion 57. In other words, the portion 50a of the substrate body 50 is provided adjacent to each of the outer edge 50b of the substrate body 50 and the cutout portion 57.

[0081] In this way, the portion 50a of the substrate body 50 inserted into the through hole 32a of the magnetic core 32 does not necessarily have to be the portion between the two openings 51, 52. The portion 50a of the substrate body 50 inserted into the through hole 32a of the magnetic core 32 may be any thin plate-like portion provided adjacent to at least one of an opening and a notch provided in the substrate body 50.

[0082] FIG. 10 is a perspective view that illustrates a modified example of a portion of the board unit according to the embodiment. 10, in this example, the substrate 30 has an opening 70 corresponding to the shape of the magnetic core 32. In this example, the magnetic core 32 is attached onto the substrate 30 so as to be fitted into the opening 70.

[0083] In this way, the method of attaching the magnetic core 32 to the substrate 30 is not limited to the method of attaching the part 50a of the substrate body 50 in a state where it is inserted into the through hole 32a, but may be a method of attaching it on the substrate 30. In this case, for example, a cylindrical core can be used without being limited to a split core, and the degree of freedom in selecting the magnetic core 32 can be increased.

[0084] In this example, the magnetic core 32 is attached onto the substrate 30 by fitting the magnetic core 32 into the opening 70. When attaching the magnetic core 32 onto the substrate 30, the substrate 30 does not necessarily have to have the opening 70. However, by providing the opening 70, for example, it is possible to facilitate the positioning of the cylindrical magnetic core 32, making it easier to attach the magnetic core 32 onto the substrate 30.

[0085] When mounting the magnetic core 32 on the substrate 30, it is preferable to hold the magnetic core 32 in the mounted state on the substrate 30 by, for example, a holding member (not shown). Alternatively, the magnetic core 32 may be adhered to the substrate 30 to hold (fix) the magnetic core 32 in the mounted state on the substrate 30.

[0086] In this example, the substrate 30 has a substrate main body 50, a pair of terminal portions 71, 72 provided on the substrate main body 50, and a wiring member 74 that electrically connects the pair of terminal portions 71, 72 when inserted into the through hole 32a of the magnetic core 32, and the wiring member 74 is part of a wiring path that is inserted into the through hole 32a.

[0087] In this way, a part of the wiring path of the board 30 inserted into the through hole 32a is not limited to a part of the wiring pattern provided on the board 30, and may be a wiring member 74 attached to the board body 50. The wiring member 74 is a cable such as a jumper wire. The wiring member 74 may be, for example, a flexible printed circuit board or a printed wiring board separate from the board body 50. The wiring member 74 may be any member capable of electrically connecting the pair of terminal portions 71, 72 in a state where the wiring member 74 is inserted into the through hole 32a. The terminal portions 71, 72 are, for example, pads provided on the surface of the board body 50, similar to the terminal portions 53a to 53d and 54a to 54d.

[0088] Also, in this example, one wiring member 74 is inserted into the through hole 32a. The number of wiring members 74 inserted into the through hole 32a is not limited to one, and may be two or more. Also, one wiring member 74 may include two or more wires. One wiring member 74 may include, for example, two wires that electrically connect the switching circuit 20 and the pair of output terminal portions 16a, 16b. In this case, the board main body 50 may have four terminal portions corresponding to the two wires, respectively.

[0089] In each of the above embodiments, an example is shown in which the board unit 12 is applied to the power supply device 10 of the lighting fixture 2. The board unit 12 is not limited to the power supply device 10, but can be applied to any device that needs to suppress noise output from the board 30 to the outside. The board unit 12 may be applied, for example, to a dimmer that inputs a dimming signal (e.g., a PWM signal) to the lighting fixture 2 (power supply device 10) to change the brightness of the lighting fixture 2. For example, a magnetic core 32 may be provided between a switching circuit that generates a dimming signal and an output terminal unit to suppress noise propagating from the dimmer to the lighting fixture 2.

[0090] The present embodiment includes the following aspects. (Appendix 1) a substrate unit having a substrate and a magnetic core attached to the substrate; A pair of output terminals provided on the substrate and used for connection to a light source unit; a switching circuit provided on the substrate, the switching circuit having a switching element, the switching circuit converting input power into power corresponding to the light source unit by switching the switching element, and supplying the converted power to the pair of output terminals, thereby lighting the light source unit connected to the pair of output terminals; Equipped with The magnetic core has a through hole and is attached to the substrate so that a portion of the wiring path of the substrate is inserted into the through hole, thereby suppressing noise output from the substrate to the outside.

[0091] (Appendix 2) The substrate has a substrate body and at least one of an opening and a notch provided in the substrate body, the substrate body has a thin plate-shaped portion provided adjacent to at least one of the opening and the notch portion, 2. The power supply device according to claim 1, wherein the magnetic core is attached to the substrate with the portion of the substrate body inserted into the through hole.

[0092] (Appendix 3) The power supply device described in Appendix 2, characterized in that the substrate has a wiring pattern, a portion of the wiring pattern is provided on the portion of the substrate body, and a portion of the wiring pattern is part of the wiring path that is inserted into the through hole.

[0093] (Appendix 4) 4. The power supply device according to claim 3, wherein a portion of the wiring pattern is configured so that the number of turns around the magnetic core can be changed.

[0094] (Appendix 5) The power supply device described in Appendix 1 or 2, characterized in that the board has a board body, a pair of terminal portions provided on the board body, and a wiring member that electrically connects the pair of terminal portions when inserted into the through hole of the magnetic core, the wiring member being part of the wiring path that is inserted into the through hole.

[0095] (Appendix 6) The power supply device according to any one of appendices 1 to 5, characterized in that the magnetic core is attached to the substrate such that two wires, which are part of the wiring path of the substrate and electrically connect the switching circuit and the pair of output terminal portions, are inserted into the through hole.

[0096] (Appendix 7) A light source unit; A power supply device according to any one of claims 1 to 6, A lighting fixture comprising:

[0097] (Appendix 8) A substrate; A magnetic core attached to the substrate; Equipped with The magnetic core has a through hole and is attached to the substrate so that a portion of the wiring path of the substrate is inserted into the through hole, thereby suppressing noise output from the substrate to the outside.

[0098] Although some embodiments and examples of the present invention have been described, these embodiments or examples are presented as examples and are not intended to limit the scope of the invention. These novel embodiments or examples can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments or examples and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0099] 2...Lighting fixture, 4...Light source unit, 4a...Light source, 10...Power supply device, 12...Board unit, 14a, 14b...Input terminal portion, 16a, 16b...Output terminal portion, 18...Conversion circuit, 20...Switching circuit, 22...Control circuit, 24...Housing, 30...Board, 32...Magnetic core, 32a...Through hole, 40...Switching element, 42...Diode, 44...Inductor, 46...Output capacitor, 50...Board body, 51, 52...Opening, 53, 54...Part of wiring pattern, 55-57...Notch portion, 61, 62...Core body, 63...Case, 70...Opening, 71, 72...Terminal portion, 74...Wiring member, PS...Power supply

Claims

1. a substrate unit having a substrate and a magnetic core attached to the substrate; A pair of output terminals provided on the substrate and used for connection to a light source unit; a switching circuit provided on the substrate, the switching circuit having a switching element, the switching circuit converting input power into power corresponding to the light source unit by switching the switching element, and supplying the converted power to the pair of output terminals, thereby lighting the light source unit connected to the pair of output terminals; Equipped with The magnetic core has a through hole and is attached to the substrate so that a portion of the wiring path of the substrate is inserted into the through hole, thereby suppressing noise output from the substrate to the outside.

2. The substrate has a substrate body and at least one of an opening and a notch provided in the substrate body, the substrate body has a thin plate-shaped portion provided adjacent to at least one of the opening and the notch portion, 2. The power supply device according to claim 1, wherein the magnetic core is attached to the board with the portion of the board body inserted into the through hole.

3. The power supply device according to claim 2, characterized in that the substrate has a wiring pattern, a portion of the wiring pattern is provided on the portion of the substrate body, and a portion of the wiring pattern is made to be part of the wiring path that is inserted into the through hole.

4. 4. The power supply device according to claim 3, wherein a part of the wiring pattern is configured so that the number of turns around the magnetic core can be changed.

5. The power supply device described in claim 1, characterized in that the substrate has a substrate main body, a pair of terminal portions provided on the substrate main body, and a wiring member that electrically connects the pair of terminal portions when inserted into the through hole of the magnetic core, the wiring member being part of the wiring path that is inserted into the through hole.

6. The power supply device according to claim 1, characterized in that the magnetic core is attached to the substrate so that two wires, which are part of the wiring path of the substrate and electrically connect the switching circuit and the pair of output terminal portions, are inserted into the through hole.

7. A light source unit; A power supply device according to any one of claims 1 to 6, A lighting fixture comprising:

8. A substrate; A magnetic core attached to the substrate; Equipped with The magnetic core has a through hole and is attached to the substrate so that a portion of the wiring path of the substrate is inserted into the through hole, thereby suppressing noise output from the substrate to the outside.

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