Power feeding device, electric machine, and lighting device

Abstract

To provide a power feeding device capable of suppressing excessive heating of a metal plate.SOLUTION: A power feeding device 100 includes a placement unit 111 and a power feeding unit 120. An electric machine 200 is mounted on the placement unit 111. The power feeding unit 120 supplies power to a power receiving unit 250 of the electric machine 200. The placement unit 111 includes a first portion 151 and a second portion 152. The first portion 151 is disposed near the power feeding unit 120, and in a cross-sectional view, indicates a portion where a distance from the surface of the first portion 151 to the power feeding unit 120 is a first distance L1. The second portion 152, in a cross-sectional view, indicates a portion where a distance from the surface of the second portion 152 to the power feeding unit 120 is a second distance L2. The first distance L1 is longer than the second distance L2.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a power supply device, an electric device, and a lighting device. [Background technology]

[0002] The non-contact power supply type electric appliance described in Patent Document 1 includes a power supply stand incorporating a power supply coil, and a heating container incorporating a power receiving coil that receives power from the power supply coil in a non-contact manner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7006871 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the non-contact power supply type electric appliance described in Patent Document 1, when a metal plate is placed on the power supply coil of the power supply stand, the metal plate may be excessively heated.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a power supply device, an electrical device, and a lighting device that can prevent a metal plate from being excessively heated when the metal plate is placed on a power supply coil. [Means for solving the problem]

[0006] The power supply device of the present invention comprises a mounting section and a power supply section. An electric device is mounted on the mounting section. The power supply section supplies power to a power receiving section of the electric device. The mounting section includes a first section and a second section. The first section is disposed near the power supply section and indicates a section where a distance from a surface of the first section to the power supply section is a first distance in a cross-sectional view. The second section indicates a section where a distance from a surface of the second section to the power supply section is a second distance in a cross-sectional view. The first distance is longer than the second distance.

[0007] According to the power supply device of the present invention, it is preferable that the first portion overlaps with the power supply unit in a first direction, The first direction indicates a direction from the power supply unit toward the placement unit.

[0008] According to the power supply device of the present invention, it is preferable that the first portion has a protruding portion protruding from the placement portion in the first direction, and the protruding portion is preferably detachable from the placement portion.

[0009] According to the power supply device of the present invention, it is preferable that the first portion has a protruding portion protruding from the mounting portion in the first direction, and the protruding portion preferably has a ring shape.

[0010] According to the power supply device of the present invention, it is preferable that the first portion is located near an outer edge of the power supply part.

[0011] An electric device of the present invention preferably includes the power supply device according to any one of claims 1 to 5 and a power receiving unit. It is preferable that the power receiving unit receives power from the power supply unit.

[0012] The electrical device of the present invention preferably has a bottom portion in contact with the mounting portion. The bottom portion preferably has a recessed portion recessed in the first direction. When the electrical device is placed on the mounting portion, the first portion preferably is inserted into the recessed portion.

[0013] The lighting device of the present invention comprises a power supply device according to any one of claims 1 to 5, and a lighting device. The lighting device comprises a light source unit that emits light. The lighting device comprises a power receiving unit and a housing. The power receiving unit receives power from the power supply unit. The light source unit and the power receiving unit are fixed to the housing. The housing has a bottom that contacts the placement unit. The bottom has a recessed portion that is recessed in the first direction. When the lighting device is placed on the placement unit, the first portion is inserted into the recessed portion. Effect of the Invention

[0014] According to the power supply device, the electrical device, and the lighting device of the present invention, when a metal plate is placed on the power supply coil, the metal plate can be prevented from being excessively heated. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 illustrates a lighting system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing a power supply device of the lighting system according to the embodiment. [Diagram 3] 1 is a diagram showing a cross section of a lighting system according to an embodiment of the present invention. [Figure 4] FIG. 2 is a diagram showing an electrical circuit of the lighting system according to the embodiment. [Diagram 5] FIG. 2 is a diagram showing a power supply device of the lighting system according to the embodiment. [Figure 6] 1 is a table showing the temperature rise of a metal plate. [Figure 7] FIG. 1 is a diagram showing a lighting system according to a first modified example of the present embodiment. [Figure 8] FIG. 11 is a diagram illustrating a power supply device according to a first modified example of the present embodiment. [Figure 9] 9 is a cross-sectional view of the power supply device shown in FIG. 7 along the line IX-IX. [Figure 10] FIG. 11 is a diagram showing a lighting system according to a second modified example of the present embodiment. [Figure 11] FIG. 11 is another diagram showing the lighting system according to the modified example 2 of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0017] A lighting system 1 according to an embodiment of the present invention will be described with reference to Fig. 1 to Fig. 4. Fig. 1 is a diagram showing the lighting system 1 according to an embodiment of the present invention. Fig. 2 is a diagram showing a power supply device 100 of the lighting system 1 of the present embodiment. Fig. 3 is a diagram showing a cross section of the lighting system 1 according to the present embodiment.

[0018] As shown in FIG. 1, the lighting system 1 includes a lighting device 200 and a power supply device 100.

[0019] The lighting device 200 emits light. The lighting device 200 is placed on the power supply device 100. The lighting device 200 corresponds to an example of an "electrical device". The lighting device 200 is separable from the power supply device 100. The lighting device 200 is supplied with power from the power supply device 100.

[0020] As shown in FIGS. 1 and 3, the lighting device 200 includes a housing 202, a light source unit 221, a diffusion member 225, and a shade 201.

[0021] The housing 202 houses the power receiving unit 250, which will be described with reference to Fig. 3. To the housing 202, a light source unit 221, a diffusion member 225, and a shade 201 are fixed.

[0022] 3, the light source unit 221 emits light. The light source unit 221 includes a light source 222 and a light source substrate 223. The light source 222 is, for example, a light emitting element. The light source 222 is mounted on a mounting surface of the light source substrate 223. In this embodiment, the light source 222 is configured as a COB (Chip on Board) type. The light source 222 may be an SMD (Surface Mount Device) type.

[0023] The light source substrate 223 has a thin plate shape. The light source substrate 223 may be an annular thin plate. The light source substrate 223 may be a disk-shaped thin plate. The light source substrate 223 is fixed to the housing 202. The LED package may be mounted to fit any three-dimensional device shape.

[0024] Diffusion member 225 has a function of diffusing the highly directional light emitted from light source 222 over a wide range and a function of expanding the orientation angle. In addition, it prevents dust from adhering to light source unit 221. Diffusion member 225 is fixed to housing 202. Diffusion member 225 is hemispherical.

[0025] The diffusion member 225 covers the light source unit 221. Specifically, the diffusion member 225 covers the irradiation surface side of the light source unit 221. The diffusion member 225 transmits light from the light source unit 221. The diffusion member 225 also reflects and diffuses the light from the light source unit 221. The diffusion member 225 is formed of, for example, a translucent resin.

[0026] The shade 201 transmits light from the light source unit 221. Specifically, the shade 201 transmits light that has passed through the diffusion member 225. It is preferable that the shade 201 diffuses the light when transmitting the light from the light source unit 221. This makes it appear from the outside of the shade 201 that the light source unit 221 is lit in a planar manner rather than in a dot manner.

[0027] The shade 201 is disposed above the housing 202. The shade 201 is spherical. Note that the shape of the shade 201 in this embodiment is merely an example, and it may be a hemisphere, a cylindrical shape with a bottom, a dome shape, or a square cylinder with a bottom.

[0028] The shade 201 is formed of, for example, an elastic member having translucency. The elastic member is, for example, silicone rubber. Therefore, the shade 201 has flexibility. Therefore, even if the shade 201 is hit, it is possible to prevent it from breaking. In other words, even if a person accidentally comes into contact with the shade 201, it is possible to prevent the shade 201 from breaking. The shade 201 may also be formed of resin. For example, the shade 201 is formed of a translucent acrylic resin material having translucency. Note that the shade 201 does not necessarily have to be silicone rubber, and may be transparent glass, paper such as Japanese paper, or a combination of these materials.

[0029] Continuing with the description, the power supply device 100 will be described with reference to Fig. 1 to Fig. 3. As shown in Fig. 1, the power supply device 100 includes a housing 101, wiring 102, and a connector 103. As shown in Fig. 1 and Fig. 2, the power supply device 100 is embedded in the top plate of a desk.

[0030] The housing 101 houses components of the power supply device 100. The housing 101 is a part of a desk.

[0031] The wiring 102 transmits power from the connector 103. The connector 103 is connected to an external power source. The external power source is, for example, a DC power source or an AC power source.

[0032] Next, the lighting device 200 and the power supply device 100 will be described in more detail with reference to Fig. 1 to Fig. 4. Fig. 3 is a diagram showing a cross section of the lighting system 1 according to the present embodiment. Fig. 4 is a diagram showing an electric circuit of the lighting system 1 according to the present embodiment. Fig. 5 is a diagram showing the power supply device 100 of the lighting system 1 according to the present embodiment.

[0033] 3, the lighting device 200 further includes a power receiving unit 250. The power receiving unit 250 receives power from the power supply device 100. The power receiving unit 250 is supplied with power from the power supply device 100 wirelessly.

[0034] As shown in FIGS. 3 and 4, the power receiving unit 250 includes a power receiving coil 252, a capacitor 251, a smoothing capacitor 253, a rectifier circuit 256, a gyro sensor 257, a control unit 258, and an LED circuit 259.

[0035] The power receiving coil 252 is magnetically coupled to the power feeding coil 122. Power is conducted to the power receiving coil 252 by electromagnetic induction.

[0036] The rectifier circuit 256 rectifies the output of the power receiving side to generate a DC voltage. The smoothing capacitor 253 smoothes the power output by the rectifier circuit 256. The gyro sensor 257 detects the angular velocity of the lighting device 200. The detection value detected by the gyro sensor 257 is sent to the control unit 258.

[0037] The control unit 258 controls the LED circuit 259. The control unit 258 includes a memory unit. The memory unit is a storage device that stores computer programs and data. The storage device includes a main storage device such as a semiconductor memory and an auxiliary storage device. The control unit 258 includes a computer such as an MCU (Micro-Control Unit). The computer includes a processor and a memory unit. The processor executes the computer programs stored in the memory unit to perform various processes.

[0038] The control unit 258 generates a PWM (Pulse Width Modulation) signal. The control unit 258 changes the duty ratio of the PWM signal to change the amount of light emitted from the light source 222. Specifically, the control unit 258 changes the duty ratio of the PWM signal based on a detection value output from the gyro sensor 257. The control unit 258 transmits the generated PWM signal to the LED circuit 259. The LED circuit 259 drives (turns on, turns off, adjusts the light source 222) based on the PWM signal.

[0039] The power supplying device 100 supplies power to the lighting device 200. The power supplying device 100 transmits the power to a power receiving unit 250 of the lighting device 200. As shown in FIG.

[0040] The power supply unit 120 supplies power to the power receiving unit 250 of the lighting device 200. The power supply unit 120 includes a power supply coil 122, an AC / DC adapter 123, and an inverter circuit .

[0041] The AC / DC adapter 123 converts an AC voltage from a commercial power source into a DC voltage. The DC voltage is applied to the inverter circuit 124. The inverter circuit 124 changes the voltage and frequency. The inverter circuit 124 changes the frequency to a high frequency.

[0042] The power supply coil 122 is magnetically coupled to the power receiving coil.

[0043] 5, the housing 101 has a mounting portion 111. The lighting device 200 is mounted on the mounting portion 111. The mounting portion 111 is a top plate of the housing 101. The mounting portion 111 also serves as a part of the top plate of a desk. The top plate of the desk may form the mounting portion 111 of the housing 101.

[0044] The mounting portion 111 includes a first portion 151 and a second portion 152. The first portion 151 is disposed in the vicinity of the power supply unit 120. As shown in FIG. 4, the first portion 151 is a portion having a first distance L1 in a cross-sectional view. The first distance L1 indicates the distance from the surface of the mounting portion 111 to the power supply unit 120. In other words, the first distance L1 indicates the distance from the surface of the first portion 151 to the power supply unit 120. The surface of the first portion 151 is, for example, a vertex portion of the first portion 151.

[0045] The second portion 152 is disposed near the power supply unit 120. As shown in Fig. 4, the second portion 152 is a portion having a second distance L2 in a cross-sectional view. The second distance L2 indicates the distance from the surface of the second portion 152 to the power supply unit 120. The first distance L1 is longer than the second distance L2.

[0046] Regarding the above points, in this embodiment, since the first portion 151 is longer than the second portion 152, the first portion 151 protrudes from the surface of the placement portion 111. Therefore, when a metal plate (metal product) is placed on the first portion 151, the metal plate can be moved away from the power supply portion 120. Therefore, when the metal plate overlaps with the first portion 151, the metal plate can be separated from the power supply portion 120. Therefore, the magnetic flux generated in the power supply portion 120 is unlikely to affect the metal plate. In other words, the generation of eddy currents in the metal plate can be suppressed. As a result, the metal plate can be suppressed from being excessively heated by eddy currents.

[0047] For example, when the power supply unit of a power supply device is embedded in the top plate of a desk, it is difficult to visually recognize the position of the power supply unit of the power supply device. For this reason, a metal plate may be placed on the power supply unit by mistake. When a metal plate is placed on the power supply device, the magnetic flux generated by the power supply unit may affect the metal plate, causing the metal plate to heat up.

[0048] 1 and 2, in this embodiment, even if the power supply device 100 is embedded in the top plate of a desk, the first portion 151 protrudes from the surface of the mounting portion 111, so that it is easy to visually recognize the position of the power supply unit 120 of the power supply device 100. Therefore, it is possible to prevent a metal plate from being placed on the power supply unit 120.

[0049] The metal plate is a broad concept including metal products, for example, machine parts such as food cans, pots, metal pressed products, power tools, springs, screws, etc., and relatively small final products, etc. In addition, when a metal plate is placed on power supply unit 120 of power supply device 100, this concept refers to a state in which the metal part of a metal product is placed on power supply unit 120 of power supply device 100.

[0050] Furthermore, first distance L1 may be the distance from the apex of first portion 151 to the electric wire of power feeding coil 122 of power feeding unit 120 in a cross-sectional view. Further, second distance L2 may be the distance from second portion 152 to the electric wire of power feeding coil 122 of power feeding unit 120 in a cross-sectional view.

[0051] First portion 151 overlaps power supply unit 120 in first direction D1. First direction D1 indicates the direction from power supply unit 120 toward mounting portion 111. Therefore, first portion 151 is disposed above power supply unit 120. That is, the metal plate is mounted on mounting portion 111 via first portion 151. Therefore, the metal plate and power supply unit 120 are separated from each other. As a result, the effect of the magnetic flux generated in power supply unit 120 on the metal plate can be reduced.

[0052] Furthermore, the first portion 151 may overlap the power feeding coil 122 of the power feeding unit 120 in the first direction D1. For example, when the power feeding coil 122 has a disk shape, the first portion 151 overlaps the power feeding coil 122 in the first direction D1. Specifically, the first portion 151 overlaps a central portion of the disk-shaped power feeding coil 122 in the first direction D1. Note that in this embodiment, the power feeding coil 122 may have a ring shape.

[0053] The first portion 151 has a protruding portion 115. The protruding portion 115 protrudes from the mounting portion 111 in the first direction D1. The protruding portion 115 is detachable from the mounting portion 111. Therefore, the mounting portion 111 can be made flat by removing the protruding portion 115. As a result, dust and the like adhering to the mounting portion 111 can be easily cleaned off.

[0054] Moreover, the protrusion 115 can inform the user that the portion where the protrusion 115 is arranged is the portion where the lighting device 200 is to be placed. Furthermore, the protrusion 115 serves as a landmark, and can prompt the user to place the lighting device 200 in a position where power can be supplied. Furthermore, since the protrusion 115 is detachable, the power supply device 100 can be stored compactly when stored in a storage box or the like. Furthermore, the protrusion 115 is preferably arranged at the center of the power supply coil 122.

[0055] The protruding portion 115 may be formed of the same material as the mounting portion 111, or may be formed of a material different from that of the mounting portion 111. That is, the protruding portion 115 may be formed integrally with the mounting portion 111. When the protruding portion 115 and the mounting portion 111 are formed integrally, the number of parts when manufacturing the lighting system 1 is reduced. When the protruding portion 115 is formed of a material different from that of the mounting portion 111, the protruding portion 115 is formed of a silicone resin. The protruding portion 115 has a protruding shape. The protruding shape may be, for example, a columnar shape, a conical shape, a columnar shape, a pyramidal shape, or a star shape. When the protruding portion 115 is formed of a material different from that of the mounting portion 111, the protruding portion 115 is attached to the mounting portion 111 with an adhesive or the like.

[0056] Second portion 152 overlaps with power feeding unit 120 in first direction D1. Specifically, second portion 152 is disposed at a position where it overlaps with power feeding coil 122 of power feeding unit 120 in first direction D1.

[0057] Next, the housing 202 of the lighting device 200 will be described in detail with reference to FIG. 1 and FIG. 3. The housing 202 may have any shape as long as it can accommodate the power receiving unit 250. As an example of the shape of the housing 202, the housing 202 has a bottomed tubular shape. Specifically, the housing 202 has a bottomed cylindrical shape. The housing 202 may have a bottomed rectangular tubular shape. As described above, an example of the shape of the housing 202 has been shown, but the housing 202 is not limited to a rectangular shape, and may have a polygonal shape, an elliptical shape, or an indefinite shape (a shape that is not particularly fixed) that can be manually deformed. More specifically, the housing 202 includes a fixing portion 204, a side wall portion 205, and a bottom portion 206.

[0058] 3, the fixing portion 204 fixes the light source substrate 223. The fixing portion 204 also fixes the diffusion member 225. Furthermore, the fixing portion 204 fixes the shade 201. The fixing portion 204 has a thin plate shape.

[0059] The side wall portion 205 is located between the fixed portion 204 and the bottom portion 206. The side wall portion 205 connects the outer edge of the fixed portion 204 to the outer edge of the bottom portion 206.

[0060] The bottom portion 206 faces the fixing portion 204. The bottom portion 206 has a thin plate shape. The bottom portion 206 contacts the mounting portion 111. The bottom portion 206 has a recessed portion 260 recessed in the first direction D1. When the lighting device 200 is mounted on the mounting portion 111, the first portion 151 is inserted into the recessed portion 260.

[0061] Therefore, it is possible to prevent the lighting device 200 placed on the placing portion 111 from shifting from a position where power can be supplied. As a result, it is possible to prevent interruption of power supply to the lighting device 200. In addition, since the protruding portion 115 enters the recessed portion 260 of the bottom portion 206, the lighting device 200 can be placed on the placing portion 111 even if the placing portion 111 has the protruding portion 115.

[0062] Moreover, the recess 260 is disposed at the center of the power receiving coil 252. Therefore, when the protrusion 115 enters the space of the recess 260, the center of the power feeding coil 122 and the center of the power receiving coil 252 coincide with each other. This improves the efficiency of power feeding.

[0063] The recess 260 corresponds to the shape of the protrusion 115. That is, if the protrusion 115 is conical, the recess 260 is also recessed in a conical shape. If the protrusion 115 is pyramidal, the recess 260 is also recessed in a pyramidal shape. When the protrusion 115 and the recess 260 are pyramidal, the angle of the lighting device 200 with respect to the power supply device 100 can be rotated by a predetermined angle.

[0064] Next, referring to FIG. 6, the temperature rise of the metal plate when the metal plate is placed on the power supply unit 120 will be described. FIG. 5 is a table G showing the temperature rise of the metal plate. The horizontal axis of table G indicates time. Specifically, the time in table G indicates the time elapsed from when the metal plate was placed at a position overlapping the power supply unit 120. The vertical axis of table G indicates temperature. Table G shows experimental results P1 to P4. Experimental results P1 to P4 were tested in a situation where the room temperature was 22 degrees. The thickness of the mounting portion 111 is "5 mm". That is, the first distance L1 of the first portion 151 is the sum of the thickness of the mounting portion 111 and the length of the protruding portion 115. The second distance L2 is the same as the thickness of the mounting portion 111. That is, the second distance L2 is "5 mm".

[0065] The dashed line in Table G indicates the experimental result P1. The first distance L1 in the experimental result P1 is "5 mm". That is, the power supply unit 120 and the metal plate are separated by 5 mm. In the experimental result P1, the temperature of the metal plate rose from "22 degrees" to "62 degrees" 10 minutes after the metal plate was placed at a position overlapping the power supply unit 120. The temperature of the metal plate rose to "66 degrees" 20 minutes after the metal plate was placed at a position overlapping the power supply unit 120. The temperature of the metal plate rose to "67 degrees" 30 minutes after the metal plate was placed at a position overlapping the power supply unit 120. The temperature of the metal plate was maintained at "67 degrees" from 30 minutes to 60 minutes.

[0066] The dashed line in Table G indicates the experimental result P2. The first distance L1 in the experimental result P2 is "7 mm". In other words, the distance between the power supply unit 120 and the metal plate is "7 mm". In the experimental result P2, the temperature of the metal plate rose from "22 degrees" to "52 degrees" 10 minutes after the metal plate was placed at a position overlapping the power supply unit 120. In addition, the temperature of the metal plate rose to "58 degrees" 20 minutes after the metal plate was placed at a position overlapping the power supply unit 120. The temperature of the metal plate was maintained at "60 degrees" from 30 minutes to 60 minutes later.

[0067] The two-dot chain line in Table G indicates the experimental result P3. The first distance L1 in the experimental result P3 is "8 mm". In other words, the distance between the power supply unit 120 and the metal plate is "8 mm". In the experimental result P3, the temperature of the metal plate rose from "22 degrees" to "48 degrees" 10 minutes after the metal plate was placed at a position overlapping the power supply unit 120. In addition, the temperature of the metal plate rose to "52 degrees" 20 minutes after the metal plate was placed at a position overlapping the power supply unit 120. The temperature of the metal plate was maintained at "52 degrees" from 30 minutes to 60 minutes later.

[0068] The solid line in Table G shows the experimental result P4. The first distance L1 in the experimental result P4 is "10 mm". In other words, the distance between the power supply unit 120 and the metal plate is "10 mm". In the experimental result P4, the temperature of the metal plate rose from "22 degrees" to "38 degrees" 10 minutes after the metal plate was placed at a position overlapping the power supply unit 120. In addition, the temperature of the metal plate rose to "42 degrees" 20 minutes after the metal plate was placed at a position overlapping the power supply unit 120. The temperature of the metal plate was maintained at "42 degrees" from 30 minutes to 60 minutes later.

[0069] 6, the greater the distance between the metal plate and power supply unit 120, the smaller the temperature rise of the metal plate. In other words, the greater the first distance L1, the more the metal plate is prevented from being overheated. In other words, even if the metal plate is heated, it will be at a temperature that the user can touch with bare hands.

[0070] Modifications of the embodiment of the present disclosure will be described below. In the following description, components having substantially the same functions as those described in the present embodiment will be referred to by the same reference numerals, and the description of the present embodiment will be used. In the modification, only the parts different from the present embodiment will be described, and the description of the present embodiment will be used for the other parts.

[0071] [Variation 1] Fig. 7 is a diagram showing a lighting system 1 according to Modification 1 of the present embodiment. Fig. 8 is a diagram showing a power supply device 100 according to Modification 1 of the present embodiment. Fig. 9 is a diagram showing a IX-IX cross section of the power supply device 100 shown in Fig. 8. Modification 1 differs from the present embodiment in that it has a plurality of first portions 151.

[0072] 7, the first portion 151 of the first modification of this embodiment has a plurality of first portions 151. The plurality of first portions 151 include a first portion 151A and a first portion 151B. The first portion 151A overlaps with the power supply portion 120 in the first direction D1. The first portion 151A is located inside the first portion 151B. The first portion 151A has a protrusion 115A.

[0073] First portion 151B is located near the outer edge of power supply unit 120. When the metal plate overlaps first portion 151B, the metal plate can be separated from power supply unit 120. As a result, the influence of magnetic flux on the metal plate can be reduced. In other words, heating of the metal plate can be further suppressed.

[0074] The vicinity of the outer edge of power supply unit 120 refers to a position different from the center of power supply coil 122. Specifically, the vicinity of the outer edge of power supply unit 120 refers to a position overlapping with the outer edge of power supply unit 120, the outside of the outer edge of power supply unit 120, and the inside of the outer edge of power supply unit 120.

[0075] Specifically, the first portion 151B has a protruding portion 115B protruding from the mounting portion 111 in the first direction D1. As shown in FIG. 8, the protruding portion 115B has a ring shape. Therefore, the protruding portion 115B is arranged so as to surround the power supply portion 120. As a result, it is possible to prevent a metal plate from entering the inside of the protruding portion 115B arranged in a ring shape. Furthermore, even if a metal plate is arranged at a position overlapping with the protruding portion 115B, the metal plate can be separated from the power supply portion 120 as long as the metal plate is placed on the protruding portion 115B. As a result, it is possible to further reduce the influence of the magnetic flux on the metal plate.

[0076] The ring shape may be a ring shape with a portion missing. Furthermore, the protruding portion 115B may have the same shape as the protruding portion 115A. For example, when the protruding portion 115A is cylindrical, the protruding portion 115B may be cylindrical.

[0077] Moreover, in the first modification, protruding portion 115A and protruding portion 115B are arranged on mounting portion 111. Therefore, the metal plate is supported by protruding portion 115A and protruding portion 115B. In other words, the metal plate is unlikely to be supported in an inclined state.

[0078] When the metal plate is tilted, for example, the distance from power supply unit 120 to the metal plate differs between the portion supported by protrusion 115A and the portion not supported by protrusion 115A. In other words, the closer the distance to power supply unit 120, the more the metal plate is affected by the magnetic flux and is more likely to be heated. However, when the metal plate is supported by protrusions 115A and 115B, the metal plate does not tilt and is separated from power supply unit 120. This further reduces the effect of the magnetic flux on the metal plate.

[0079] As shown in FIG. 9, the first portion 151A and the first portion 151B are portions that define a first distance L1.

[0080] 7, bottom 206 of housing 202 of lighting device 200 of modification 1 has a plurality of recesses 260. The plurality of recesses 260 includes recesses 260A and 260B.

[0081] The first portion 151A is inserted into the recessed portion 260A. The first portion 151B is inserted into the recessed portion 260B. The recessed portion 260B is formed from the bottom portion 206 to the side wall portion 205.

[0082] [Variation 2] Fig. 10 is a diagram showing a lighting system 1 according to Modification 2 of the present embodiment. Fig. 11 is another diagram showing a power supply device 100 according to Modification 1 of the present embodiment. Modification 2 differs from the present embodiment in that the power supply device 100 is placed on a desk.

[0083] As shown in Fig. 10 and Fig. 11, the power supply device 100 of this embodiment is placed on the top of a desk. In other words, the power supply device 100 and the desk are separate entities. This allows the power supply device 100 to be moved to a position of the user's choice. As a result, the lighting device 200 can be moved to a position of the user's choice.

[0084] The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments, and can be implemented in various forms without departing from the spirit of the present invention. The drawings are mainly schematic illustrations of each component for ease of understanding, and the thickness, length, number, spacing, etc. of each component shown in the drawings are different from the actual ones due to the convenience of drawing. In addition, the speed, material, shape, dimensions, etc. of each component shown in the above embodiments are merely examples and are not particularly limited, and various changes are possible within a range that does not substantially deviate from the configuration of the present invention. [Industrial Applicability]

[0085] INDUSTRIAL APPLICABILITY The present invention provides a power supply device capable of preventing a metal plate from being excessively heated, and has industrial applicability. [Explanation of symbols]

[0086] 100: Power supply device 101: Housing 111: Placement section 115:Protrusion 115A:Protrusion 115B:Protrusion 120: Power supply unit 151 :1st part 151A: 1st part 151B: 1st part 152 :Second part 200: Lighting equipment 202: Housing 206: Bottom 221: Light source section 222 :Light source 250: Power receiving section 260: Recess 260A: Recess 260B: Recess D1: 1st direction L1: 1st distance L2: 2nd distance

Claims

1. a placement section on which the electrical device is placed; a power supply unit that supplies power to a power receiving unit of the electrical device; Equipped with The placement portion includes a first portion and a second portion, the first portion is disposed near the power supply portion, and in a cross-sectional view, a distance from a surface of the first portion to the power supply portion is a first distance; the second portion indicates a portion where a distance from a surface of the second portion to the power supply portion is a second distance in a cross-sectional view, The power supply device, wherein the first distance is greater than the second distance.

2. the first portion overlaps with the power supply portion in a first direction, The power supply device according to claim 1 , wherein the first direction indicates a direction from the power supply unit toward the placement unit.

3. the first portion has a protruding portion protruding from the placement portion in the first direction, The power supply device according to claim 2 , wherein the protrusion is detachable from the placement portion.

4. the first portion has a protruding portion protruding from the placement portion in the first direction, The power supply device according to claim 2 , wherein the protrusion has a ring shape.

5. The power supply device according to claim 3 , wherein the first portion is located near an outer edge of the power supply part.

6. The power supply device according to any one of claims 1 to 5, a power receiving unit to which power is transmitted from the power supply unit; An electrical device comprising:

7. the electrical device has a bottom portion in contact with the placement portion, The bottom portion has a recessed portion recessed in the first direction, The electrical device according to claim 6 , wherein the first portion is inserted through the recess when the electrical device is placed on the placement portion.

8. The power supply device according to any one of claims 1 to 5, A lighting device including a light source unit that emits light; Equipped with The lighting device includes: a power receiving unit to which power is transmitted from the power supply unit; a housing to which the light source unit and the power receiving unit are fixed; Equipped with the housing has a bottom portion in contact with the placement portion, The bottom portion has a recessed portion recessed in the first direction, When the lighting device is placed on the placement portion, the first portion is inserted into the recessed portion.

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