Power supply device

Abstract

To provide a power supply device capable of reducing internal temperature.SOLUTION: The power supply device 10 includes a power supply board 11 on which a power supply component 19 is mounted, and a first housing 16 having a bottom surface part 44, a side surface part 46, and an upper surface part 45 and housing the power supply board 11 in a posture in which a board surface 11a of the power supply board 11 faces the bottom surface part 44 side. The first housing 16 has the first opening 55 in the bottom portion 44 and the second opening 58 in at least one of the side portion 46 and the top portion 45.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to a power supply device. [Background technology]

[0002] Conventionally, there are power supply devices that house a power supply board with power supply components mounted in a housing. In these power supply devices, multiple through holes are provided on the top and side surfaces of the housing to dissipate heat generated during operation of the power supply board.

[0003] This power supply device has multiple through holes on the top and sides of the housing, but heat generated during operation of the power supply board may accumulate on the bottom side of the housing, causing the internal temperature to rise. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4038994 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a power supply device capable of reducing the internal temperature. [Means for solving the problem]

[0006] The power supply device of the embodiment includes a power supply board on which power components are mounted, and a first housing having a bottom surface, side surfaces, and a top surface, and housing the power supply board with the board surface facing the bottom surface. The first housing has a first opening provided in the bottom surface and a second opening provided in at least one of the side surfaces and the top surface. [Effects of the Invention]

[0007] According to the embodiment, it is expected to provide a power supply device that can improve the heat dissipation effect on the bottom side and reduce the internal temperature. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a power supply device according to an embodiment; [Figure 2] FIG. [Figure 3] FIG. 2 is a perspective view showing the bottom side of the power supply device. [Figure 4] 3 is a cross-sectional view of the power supply device taken along a lateral direction intersecting the longitudinal direction thereof. FIG. [Figure 5] FIG. 2 is a cross-sectional view of the power supply device taken along the longitudinal direction. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment will be described below with reference to the drawings.

[0010] Figures 1 to 5 show a power supply unit 10. The power supply unit 10 is used in lighting devices such as downlights. In the case of downlights, the power supply unit 10 is installed separately from the lamp body equipped with a light source and is electrically connected to the lamp body via a cable. When installing the lighting device, a power line is drawn out from a recessed hole provided in the ceiling board, which is the installation surface, and connected to the power supply unit 10. Then, the power supply unit 10 is inserted into the ceiling space through the recessed hole and placed on the ceiling board, and the lamp body is installed by recessing it into the recessed hole.

[0011] Power supply device 10 is configured in a rectangular parallelepiped shape and has a longitudinal direction and a lateral direction intersecting the longitudinal direction when viewed from above. Power supply device 10 includes power supply board 11 (see FIGS. 4 and 5), second housing 12 which is an inner housing that houses power supply board 11, wireless communication unit 13, control unit 14, and second terminal block 15 which is an internal terminal block arranged in second housing 12, first housing 16 which is an outer housing that houses power supply board 11, second housing 12, wireless communication unit 13, and control unit 14, and first terminal block 17 which is an outer terminal block arranged in first housing 16. At least power supply board 11 and second housing 12 that houses power supply board 11 constitute power supply device main body 10a.

[0012] The power supply board 11 is, for example, a printed wiring board, and is made of an insulating material and has a rectangular board body with the upper surface being the component surface and the lower surface being the solder surface, with a wiring pattern formed on the solder surface (board surface 11a). The power supply board 11 is equipped with a plurality of power supply components 19 that constitute a power supply circuit. The power supply circuit converts AC power, which is external power supplied via a power line, into lighting power that lights the light source of the lamp and supplies it to the light source. The power supply circuit dims the light source in response to a control signal input from a control unit 14. A connector 20 that outputs lighting power to the lamp is equipped on one end of the power supply board 11.

[0013] The power supply components 19 include lead components, such as inductors and electrolytic capacitors, whose component bodies are arranged on the component surface of the power supply board 11 and whose lead wires are inserted through through holes provided in the power supply board 11 and soldered to patterns on the board surface 11a, and surface-mounted components, such as chip components such as switching elements and resistors that perform power conversion, that are surface-mounted on the board surface 11a. Of the power supply components 19, the heat-generating component 19a, such as the switching element that performs power conversion, is the component that generates the most heat, and this heat-generating component 19a is mounted in the central region of the board surface 11a.

[0014] The second housing 12 is made of metal and is shaped like a rectangular parallelepiped box. The second housing 12 is shaped like a rectangular parallelepiped box having six faces: a bottom face 22, a top face 23, side faces 24 on both sides in the short direction, and end faces 25 on both ends in the long direction. At both ends in the long direction of the bottom face 22, approximately L-shaped legs 26 are provided that protrude downward from the bottom face 22. The second housing 12 is shaped like a six-sided rectangular parallelepiped box by combining lower second housing parts that form the bottom face 22 and the legs 26 with upper second housing parts that form the top face 23, side faces 24, and end faces 25.

[0015] A power supply board 11 is housed inside the second housing 12. The power supply board 11 is housed in a horizontal position with the board surface 11a facing the bottom surface 22 and substantially parallel to it. The power supply board 11 is disposed in a vertical position closer to the bottom surface 22 than the top surface 23. A heat-generating component 19a mounted on the board surface 11a of the power supply board 11 faces closely to the bottom surface 22, and a heat dissipation sheet 27, which is a heat dissipation member that transfers heat generated by the heat-generating component 19a to the bottom surface 22 and dissipates the heat, is disposed between the heat-generating component 19a and the bottom surface 22. An insulating sheet 28 is disposed along the inner surface of the second housing 12 to provide insulation from the power supply board 11. Furthermore, a connection hole 29 is provided in one end surface 25 so as to face the connector 20 of the power supply board 11 (see FIG. 3).

[0016] The wireless communication unit 13 is attached to the top surface 23 of the second housing 12 at the end opposite to the end in the longitudinal direction where the second terminal block 15 is located. The wireless communication unit 13 is located within the area of ​​the top surface 23 when viewed from above the second housing 12. The wireless communication unit 13 has a rectangular box-shaped case 31, which houses a communication unit that communicates using radio signals, an antenna that transmits and receives radio signals, and the like. The wireless communication unit 13 communicates with external control devices and other lighting devices based on a predetermined communication standard such as Wi-Fi (registered trademark) or Bluetooth (registered trademark), and receives and transmits control signals such as dimming signals.

[0017] The control unit 14 is mounted on the top surface 23 of the second housing 12, between the second terminal block 15 and the wireless communication unit 13. The control unit 14 is disposed within the area of ​​the top surface 23 when viewed from above the second housing 12. The control unit 14 includes a control board 33, a case 34 that houses the control board 33, and terminal blocks 35, 36 and a connector 37 mounted on the control board 33. A control circuit provided on the control board 33 of the control unit 14 receives a dimming signal from the wireless communication unit 13, generates a control signal based on the dimming signal, and outputs the control signal to the power supply circuit of the power supply board 11 to control the dimming of the light source. The terminal block 35 is mounted on the end of the control board 33 that faces the second terminal block 15, and is connected to the second terminal block 15 by a wiring 38. The terminal block 35 supplies AC power supplied through the second terminal block 15 to the control board 33. The terminal block 36 is mounted on the end side of the control board 33 on the wireless communication unit 13 side, is connected to the second terminal block 15 by a wire 39, and outputs a control signal to the power supply board 11 through the second terminal block 15. The connector 37 is mounted on the end side of the control board 33 on the wireless communication unit 13 side, and is connected to the wireless communication unit 13 by a wire 40, and exchanges signals between the wireless communication unit 13 and the control unit 14.

[0018] Second terminal block 15 is attached to bottom surface 22 protruding from end surface 25 at the end opposite to the end where connection hole 29 is provided on second housing 12. Second terminal block 15 is connected to first terminal block 17 by wiring 41, and supplies AC power input through first terminal block 17 to power supply board 11 and also to control unit 14 through wiring 38. Second terminal block 15 also outputs a control signal input from control unit 14 through wiring 40 to power supply board 11.

[0019] The first housing 16 is made of metal and shaped like a cubic box, and houses the second housing 12, which houses the power supply board 11, the wireless communication unit 13, the control unit 14, and other components. The first housing 16 is shaped like a rectangular parallelepiped box having six faces: a bottom face 44, a top face 45, side faces 46 on both sides in the shorter direction, and end faces 47, 48 on both ends in the longer direction. The bottom face 44 is provided at both ends in the longer direction with approximately L-shaped legs 49 that protrude downward from the bottom face 44. The first housing 16 is shaped like a six-sided rectangular parallelepiped box, and is formed by combining a bottom plate 50 that forms the bottom face 44 and the legs 49, a cover 51 that forms the top face 45, both side faces 46, and one end face 47, and an end plate 52 that forms the other end face 48.

[0020] The bottom plate 50 has a rectangular bottom surface 44, edges 53 raised from both short sides of the bottom surface 44, and legs 49 provided on both longitudinal ends of the bottom surface 44. The legs 26 on both ends of the second housing 12 are disposed on the bottom surface 44 and fixed by screws. A gap or bottom space 54 is formed between the bottom surface 44 and the bottom surface 22 of the second housing 12 by the legs 26 on both ends of the second housing 12.

[0021] The bottom surface portion 44 of the bottom plate 50 is provided with a first opening 55, which is an air inlet opening or bottom opening that communicates with the interior (bottom space 54) of the first housing 16. The first opening 55 is formed in a rectangular shape in the central region of the bottom surface portion 44. The first opening 55 and the heat-generating component 19a of the power supply board 11 are positioned so that at least a portion (preferably the entirety) of the first opening 55 overlap in the vertical direction. In other words, the region of the heat-generating component 19a facing the bottom surface portion 22 of the second housing 12, where the heat of the heat-generating component 19a is transferred to the bottom surface portion 22 of the second housing 12 via the heat dissipation sheet 27, is positioned so that at least a portion (preferably the entirety) of the heat-generating region faces the first opening 55.

[0022] The first opening 55 may be one large opening, may be divided into multiple openings, or may be provided in the form of a slit.

[0023] Cover 51 has a rectangular top surface 45, side surfaces 46 bent downward from both sides in the short direction of top surface 45, and end surfaces 47 bent downward from one side in the longitudinal direction of top surface 45, with the bottom surface and the end surface opposite end surface 47 being open. The lower ends of both side surfaces 46 are positioned outside edge portions 52 on both sides of bottom plate 50 and fixed with screws. Bottom plate 50 and cover 51 form a rectangular cylindrical shape, and housed inside it are second housing 12 accommodating power supply board 11, wireless communication unit 13, control unit 14, etc.

[0024] Side spaces 56, which are gaps, are formed between the side surface portions 46 on both sides of the cover 51 and the side surfaces of the second housing 12, and these side spaces 56 are in communication with the bottom space 54. A top space 57, which is a gap, is formed between the top surface portion 45 of the cover 51 and the top surface of the second housing 12, and this top space 57 is in communication with the bottom space 54 through the side spaces 56.

[0025] Second openings 58, which are air outlet openings or side openings that communicate with the interior (side space 55) of the first housing 16, are provided in the side surface portions 46 on both sides of the cover 51. The second openings 58 are circular and are formed at predetermined intervals along the longitudinal direction of the side surface portions 46. The second openings 58 are formed in an area facing the side surface of the second housing 12.

[0026] The second opening 58 may be provided as an upper opening on the upper surface portion 45. When provided on the upper surface portion 45, it is preferable to provide the second opening 58 in an area facing a metal surface such as the upper surface of the control unit 14, excluding areas facing the terminal blocks 35, 36, connector 37, and wiring 38-40. Furthermore, the second opening 58 may be provided on both the side surface portion 46 and the upper surface portion 45. The second opening 58 may be divided into multiple openings, or may be one large opening, or may be provided in the form of a slit.

[0027] The end surface 47 of the cover 51 is provided in the upper region of the end surface of the cover 51, and the underside of this end surface 47 is opened and the end surface 25 of the second housing 12 is disposed therein. A connection hole 29 is opened here to connect a cable between the connector 20 and the light body.

[0028] Cover 51 has a third opening 59 at a position facing wireless communication unit 13. Third opening 59 is provided in top surface 45, one side surface 46, and end surface 47 in accordance with the shape, posture, and position of the antenna built into wireless communication unit 13. Third opening 59 in top surface 45 and one side surface 46 is provided in a rectangular shape that is long along the longitudinal direction of first housing 16, and third opening 59 in end surface 47 is provided in a rectangular shape that is long along the short direction of first housing 16.

[0029] End plate 52 is made of metal and closes the end face that opens between cover 51 and bottom plate 50 on the side opposite end face portion 47. A bent portion 61 provided on the upper side of end plate 52 is screwed to upper surface portion 45 of cover 51, and the lower side is screwed to leg portion 49.

[0030] The first terminal block 17 is attached to the outer surface of the end plate 52 and is connected to an external power line. The first terminal block 17 is connected to the second terminal block 15 in the first housing 16 by a wire 41.

[0031] When installing the lighting device, the power line drawn out from the recessed hole provided in the ceiling board 63, which is the installation surface, is connected to the first terminal block 17 of the power supply unit 10, and then the power supply unit 10 is inserted into the ceiling through the recessed hole and placed on the ceiling board 63, and the light body connected to the power supply unit 10 by a cable is recessed and installed in the recessed hole.

[0032] When the power supply unit 10 is installed, as shown in Figures 4 and 5, the legs 49 at both ends of the first housing 16 are placed on the ceiling board 63, and a gap or ventilation space 64 is formed between the bottom surface 44 of the first housing 16 and the upper surface of the ceiling board 63.

[0033] When AC power is supplied to the power supply device 10 via the power line, the power supply board 11 operates, converting the AC power into DC lighting power and supplying it to the light source of the lamp body, lighting the light source. The AC power is also supplied to the control unit 14, which operates the control board 33 and supplies operating power to the wireless communication unit 13, causing the wireless communication unit 13 to operate.

[0034] When the wireless communication unit 13 receives a dimming signal via a radio wave signal transmitted from an external control device or another lighting device, the control unit 14 acquires the dimming signal, generates a control signal based on the dimming signal, and outputs the control signal to the power supply board 11 to dim the light source.

[0035] The radio signal passes through third opening 59 of first housing 16 and is received by or transmitted by wireless communication unit 13. Third opening 59 is provided at a position of first housing 16 facing wireless communication unit 13, and more specifically, is provided on top surface 45, one side surface 46, and end surface 47 of first housing 16 in accordance with the shape, attitude, and position of the antenna built into wireless communication unit 13, thereby improving communication quality.

[0036] Furthermore, heat is generated during operation of power supply board 11. The heat generated by power supply board 11 is transferred to second housing 12 that houses power supply board 11, and is then released from second housing 12 into the internal space of first housing 16, and is also transferred to bottom surface 44 of first housing 16 through legs 26 of second housing 12.

[0037] As the temperature of second housing 12 rises, the air inside first housing 16 is warmed, creating a temperature difference between the inside and outside of first housing 16, causing air convection (natural convection) between the inside and outside of first housing 16. Outside air, which is cooler than the inside, flows into the bottom side of the inside of first housing 16 from first opening 55 through ventilation space 64 between bottom surface portion 44 of first housing 16 and the upper surface of ceiling board 63, while air that has been warmed inside first housing 16 flows out to the outside from second opening 58, which is located higher than first opening 55 of first housing 16. Due to this air convection between the inside and outside of first housing 16, outside air flows inside first housing 16, and heat inside first housing 16 is dissipated to the outside, thereby reducing the temperature inside first housing 16.

[0038] The power supply board 11 is equipped with the heat-generating component 19a, which generates the most heat among the power supply components 19 mounted on the power supply board 11, on the board surface 11a facing the bottom surface 44 of the first housing 16. Therefore, as soon as external air flows into the inside of the first housing 16 through the first opening 55, the heat from the heat-generating component 19a is dissipated to the external air, improving the heat dissipation ability of the heat-generating component 19a and effectively reducing the internal temperature.

[0039] Moreover, first opening 55 and heat-generating component 19a of power supply board 11 are positioned so that at least a portion (preferably the entirety) of them overlap in the vertical direction, thereby improving the heat dissipation of heat-generating component 19a and effectively reducing the internal temperature. Specifically, the region of heat-generating component 19a that faces bottom surface 22 of second housing 12, where at least a portion (preferably the entirety) of the heat-generating region through which heat from heat-generating component 19a is transferred to bottom surface 22 of second housing 12 via heat dissipation sheet 27, is positioned so as to face first opening 55, thereby improving the heat dissipation of heat-generating component 19a and effectively reducing the internal temperature.

[0040] In addition, heat from the upper side of the second housing 12, the wireless communication unit 13, and the control unit 14 is radiated to the upper side of the interior of the first housing 16, but this heat is radiated from the upper side of the first housing 16 into the external air, and is also radiated to the outside through the second opening 58 by the air flow generated inside the first housing 16 due to convection, thereby reducing the temperature at the upper side of the interior of the first housing 16.

[0041] Furthermore, the air heated inside the first housing 16 is convected and flows out through the third opening 59, which is located higher than the second opening 58, thereby reducing the temperature inside the first housing 16.

[0042] The power supply device 10 is not limited to being used in downlights, but can also be used in other lighting devices, and can also be used in electrical equipment other than lighting devices.

[0043] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0044] 10 Power supply 11 Power supply board 11a Board surface 12 Second enclosure 13 Radio Communication Department 16 First cabinet 19 Power Supply Components 19a Heat generating components that generate the most heat 44 Bottom part 45 Top part 46 Side part 55 First Opening 58 Second Opening 59 Third Opening

Claims

1. a power supply board carrying power supply components; a first housing having a bottom surface, side surfaces, and a top surface, and housing the power supply board with a board surface of the power supply board facing the bottom surface; Equipped with The first housing has a first opening provided in the bottom surface portion and a second opening provided in at least one of the side surface portion and the top surface portion. A power supply device characterized by:

2. The power supply board has a surface facing the bottom surface of the first housing, on which the power supply components that generate the largest amount of heat are mounted.

2. The power supply device according to claim 1.

3. a second housing that covers the power supply board and is housed in the first housing; a wireless communication unit disposed in the second housing and housed in the first housing; The first housing has a third opening provided at a position facing the wireless communication unit.

2. The power supply device according to claim 1.

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