Wireless power supply system

Abstract

To provide a wireless power supply system that enables sufficient efficiency of power transmission without strict alignment between an electrical device and a power transmission coil by a user.SOLUTION: A wireless power supply system supplies power to an electrical device by wireless power supply. The electrical device includes a power receiving unit including a power receiving coil. The wireless power supply system includes a flat surface, a power transmitting unit, and a standing portion. The electrical device is placed on the flat surface. The power transmitting unit includes a power transmitting coil disposed below the flat surface. The power transmitting unit supplies power to the power receiving unit by the wireless power supply. The standing portion defines, on the flat surface, a boundary between an outside and an inside of a placement area for the electrical device for supplying power from the power transmitting unit to the power receiving unit by the wireless power supply. The standing portion protrudes from the flat surface.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a wireless power supply system. [Background technology]

[0002] Conventionally, there is known a technology for supplying power to an electrical device by wireless power supply. For example, in Patent Document 1, a power supply table is placed on a kitchen table. A power transmission coil is embedded in the power supply table. When the electrical device is placed on the power supply table, power is supplied to the electrical device by electromagnetic coupling between the power transmission coil and the power receiving coil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-158275 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned wireless power transfer technology, if the receiving coil is significantly offset from the transmitting coil, the efficiency of power transmission to the electrical device decreases. For this reason, for example, a line indicating the position of the transmitting coil is drawn on a table. This allows the user to know where to place the electrical device.

[0005] However, it is not easy for a user to accurately align the positions of the power transmitting coil and the power receiving coil and place the electrical device. Furthermore, although sufficient power transmission efficiency may be ensured even if the power receiving coil is slightly misaligned from the power transmitting coil, it is not easy for a user to grasp to what extent the position of the electrical device can be misaligned from the power transmitting coil in order to ensure sufficient power transmission efficiency. An object of the present invention is to provide a wireless power transfer system that allows a user to ensure sufficient power transmission efficiency without requiring precise alignment of the electrical device and the power transmitting coil. [Means for solving the problem]

[0006] A wireless power feeding system according to one aspect of the present invention supplies power to an electric device by wireless power feeding. The electric device includes a power receiving unit including a power receiving coil. The wireless power feeding system includes a flat surface, a power transmitting unit, and a wall. The electric device is placed on the flat surface. The power transmitting unit includes a power transmitting coil disposed below the flat surface. The power transmitting unit supplies power to the power receiving unit by wireless power feeding. The wall indicates a boundary between an installation range of the electric device on the flat surface and the outside of the installation range for supplying power from the power transmitting unit to the power receiving unit by wireless power feeding. The wall protrudes from the flat surface.

[0007] In the wireless power transfer system according to this aspect, the wall indicates the boundary between the installation range of the electric device for wireless power transfer and the outside of the installation range. Therefore, compared to when the position of the power transmitting coil is indicated, the user can more easily grasp the range in which the electric device should be placed. Furthermore, the wall protrudes from the flat surface. Therefore, if the electric device is not correctly placed in the installation range, the wall causes the electric device to be raised above the flat surface. Therefore, the user can easily grasp whether the electric device is correctly placed in the installation range. This ensures sufficient power transmission efficiency without the user needing to precisely align the electric device and the power transmitting coil.

[0008] The wall portion may be arranged over a wider area than the power transmitting coil on a flat surface. In this case, the wall portion is arranged over a wider area than the power transmitting coil, taking into account an allowable positional deviation of the power receiving coil relative to the power transmitting coil. This allows the user to easily place the electrical device within an installation range that ensures sufficient power transmission efficiency.

[0009] The wall may be located outside the allowable installation range of a power receiving coil that wirelessly supplies power from the power transmitting unit to the power receiving unit on a flat surface. In this case, the wall is located outside the allowable installation range of the power receiving coil, taking into account the external dimensions of the electrical device that is larger than the power receiving coil. This allows the user to easily install the electrical device within an installation range that ensures sufficient power transmission efficiency.

[0010] When the power receiving coil is placed within the installation tolerance range, the power transmission efficiency from the power transmitting unit to the power receiving unit may be maintained at or above a predetermined threshold. In this case, the user can place the electrical device inside the wall section to ensure sufficient power transmission efficiency at or above the threshold.

[0011] The distance between the wall and the allowable installation range of the power receiving coil is set based on the external dimensions of the electrical device. In this case, the power receiving coil is placed within the allowable installation range when the electrical device is placed at any position within the wall. This allows the user to easily place the electrical device within the installation range that ensures sufficient power transmission efficiency.

[0012] The flat surface may include a feed surface and a body surface. The feed surface may be located inside the wall portion. The body surface may be located outside the wall portion. The feed surface may be formed integrally with the body surface. In this case, it is easy to form the feed surface and the body surface.

[0013] The wall portion may be formed integrally with the flat surface, which makes it easier to form the wall portion.

[0014] The flat surface may be provided on a kitchen countertop, allowing the user to easily use or charge the electrical appliances on the kitchen countertop without being hindered by power cables, thereby improving the user's comfort when using the electrical appliances in the kitchen.

[0015] A wireless power feeding system according to another aspect of the present invention includes an electric device, a flat surface, a power transmitting unit, and a wall. The electric device has a power receiving unit including a power receiving coil. The electric device is placed on the flat surface. The power transmitting unit includes a power transmitting coil disposed below the flat surface. The power transmitting unit supplies power to the power receiving unit by wireless power feeding. The wall indicates a boundary between an installation range of the electric device on the flat surface and the outside of the installation range for supplying power from the power transmitting unit to the power receiving unit by wireless power feeding. The wall protrudes from the flat surface.

[0016] In the wireless power transfer system according to this aspect, the wall indicates the boundary between the installation range of the electric device for wireless power transfer and the outside of the installation range. Therefore, compared to when the position of the power transmitting coil is indicated, the user can more easily grasp the range in which the electric device should be placed. Furthermore, the wall protrudes from the flat surface. Therefore, if the electric device is not correctly placed in the installation range, the wall causes the electric device to be raised above the flat surface. Therefore, the user can easily grasp whether the electric device is correctly placed in the installation range. This ensures sufficient power transmission efficiency without the user needing to precisely align the electric device and the power transmitting coil. [Effects of the Invention]

[0017] According to the present invention, in a wireless power feeding system, sufficient power transmission efficiency is ensured without requiring the user to precisely align the electric device and the power transmitting coil. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a schematic diagram illustrating a circuit configuration of a wireless power supply system. [Figure 2] FIG. 10 is a diagram illustrating an example of a resonant circuit of a power receiving unit. [Figure 3] FIG. 1 is a perspective view showing an external configuration of a wireless power supply system. [Figure 4] FIG. [Figure 5]FIG. 10 is a top view showing the arrangement of the wall portion and the power transmission coil. [Figure 6] FIG. 10 is a perspective view showing a wall portion according to a modified example. [Figure 7] FIG. 10 is a top view showing the arrangement of a wall portion and a power transmission coil according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, a wireless power feeding system according to an embodiment will be described with reference to the drawings. Fig. 1 is a schematic diagram showing a circuit configuration of a wireless power feeding system 1. As shown in Fig. 1, the wireless power feeding system 1 includes a power transmitting unit 2, a power receiving unit 3, and an electric device 4. The power receiving unit 3 is mounted on the electric device 4. The electric device 4 includes a load 5 such as a motor, a heater, or a battery.

[0020] The power receiving unit 3 includes a power receiving coil 6. The power transmitting unit 2 includes a power transmitting coil 7. The power receiving coil 6 and the power transmitting coil 7 are electromagnetically coupled to each other, allowing the power receiving unit 3 to receive power from the power transmitting unit 2 via wireless power transfer. The power receiving unit 3 supplies the power received from the power transmitting unit 2 to the load 5.

[0021] The power transmitting unit 2 includes a power transmission control unit 8. The power transmission control unit 8 is connected to the power transmitting coil 7. The power transmission control unit 8 controls the power supplied from an external power supply 100 to the power transmitting coil 7. The power transmission control unit 8 includes a rectifier circuit 11, a DC / DC circuit 12, a DC / AC circuit 13, and a power transmission control circuit 14. The rectifier circuit 11 converts AC power from the external power supply 100 into DC power. The DC / DC circuit 12 controls the voltage and current of the DC power from the rectifier circuit 11. For example, the DC / DC circuit 12 boosts the DC power from the rectifier circuit 11.

[0022] The DC / AC circuit 13 converts the DC power from the DC / DC circuit 12 into AC power and supplies it to the transmitting coil 7. The power transmission control circuit 14 controls the DC / AC circuit 13 so that the frequency of the AC power supplied to the transmitting coil 7 becomes a predetermined target frequency. The target frequency is, for example, a frequency value at which the receiving coil 6 can resonate when the degree of coupling between the transmitting coil 7 and the receiving coil 6 is a predetermined value. The transmitting coil 7 is electromagnetically coupled with the receiving coil 6 to transmit the AC power supplied from the power transmission control unit 8 to the receiving coil 6 through space.

[0023] The power receiving unit 3 includes a power receiving control unit 9. The power receiving control unit 9 is connected to the power receiving coil 6. The power receiving control unit 9 includes a variable capacitance circuit 21, a rectifier circuit 22, a DC / DC circuit 23, and a power receiving control circuit 24. The variable capacitance circuit 21 is connected to the power receiving coil 6. The variable capacitance circuit 21 and the power receiving coil 6 form a resonant circuit 25.

[0024] The variable capacitance circuit 21 changes its capacitance in response to a signal from the power receiving control circuit 24. This changes the resonant frequency of the resonant circuit 25. For example, the power receiving control circuit 24 increases the capacitance of the variable capacitance circuit 21 to lower the resonant frequency of the resonant circuit 25. The power receiving control circuit 24 decreases the capacitance of the variable capacitance circuit 21 to raise the resonant frequency of the resonant circuit 25.

[0025] The rectifier circuit 22 converts the AC power from the resonant circuit 25 into DC power. The DC / DC circuit 23 controls the voltage and current of the DC power to be output to the load 5. The power receiving control circuit 24 detects the output voltage and output current from the DC / DC circuit 23. The output voltage is the voltage of the output power output from the DC / DC circuit 23 to the load 5. The output current is the current of the output power. The power receiving control circuit 24 controls the DC / DC circuit 23 to adjust the output voltage and output current to the load 5. For example, the power receiving control circuit 24 controls the DC / DC circuit 23 so that the output voltage is constant.

[0026] The power receiving control circuit 24 detects the input voltage from the resonant circuit 25. The input voltage is a voltage smoothed by the rectifier circuit 22. The power receiving control circuit 24 controls the variable capacitance circuit 21 in accordance with the input voltage. The power receiving control circuit 24 controls the variable capacitance circuit 21 so as to adjust the resonant frequency of the resonant circuit 25 in accordance with the input voltage.

[0027] For example, when the input voltage is lower than a predetermined lower limit, the power receiving control circuit 24 controls the capacitance of the variable capacitance circuit 21 so as to reduce the difference between the frequency of the power to the power transmitting coil 7 and the resonant frequency of the power receiving coil 6. This increases the input voltage, improving the efficiency of power transmission from the power transmitting coil 7 to the power receiving coil 6. As a result, high power transmission efficiency is maintained even when the degree of coupling between the power transmitting coil 7 and the power receiving coil 6 is low. In other words, high power transmission efficiency is maintained even when the position of the power receiving coil 6 is significantly misaligned with respect to the power transmitting coil 7.

[0028] Fig. 2 is a diagram showing an example of the resonant circuit 25 of the power receiving unit 3. As shown in Fig. 2, the resonant circuit 25 includes a first resonant circuit 31, a second resonant circuit 32, and a third resonant circuit 33. The first resonant circuit 31 includes a first coil 34 and a first variable capacitance circuit 37. The first variable capacitance circuit 37 is connected in parallel to the first coil 34. The first variable capacitance circuit 37 includes a plurality of first resonant capacitors 41, 42 and a plurality of first switching elements 51, 52.

[0029] The first resonant capacitors 41 and 42 are connected in series with the first switching elements 51 and 52, respectively. The first resonant capacitors 41 and 42 and the first switching elements 51 and 52 are connected in parallel with the first coil 34. The first switching elements 51 and 52 are, for example, n-channel MOSFETs. The drain terminals of the first switching elements 51 and 52 are connected to one end of the first coil 34 via the first resonant capacitors 41 and 42, respectively. The source terminals of the first switching elements 51 and 52 are connected to the other end of the first coil 34, respectively. The gate terminals of the first switching elements 51 and 52 are connected to the power receiving control circuit 24, respectively.

[0030] The second resonant circuit 32 includes a second coil 35 and a second variable capacitance circuit 38. The second variable capacitance circuit 38 includes a plurality of second resonant capacitors 43, 44 and a plurality of second switching elements 53, 54. The third resonant circuit 33 includes a third coil 36 and a third variable capacitance circuit 39. The third variable capacitance circuit 39 includes a plurality of third resonant capacitors 45, 46 and a plurality of third switching elements 55, 56. The configurations of the second resonant circuit 32 and the third resonant circuit 33 are similar to the configuration of the first resonant circuit 31. However, the first resonant circuit 31 is connected to the rectifier circuit 22. The second resonant circuit 32 and the third resonant circuit 33 each form a closed loop.

[0031] The first coil 34, the second coil 35, and the third coil 36 constitute the above-mentioned power receiving coil 6. The first coil 34, the second coil 35, and the third coil 36 are arranged so as to be electromagnetically coupled to one another. For example, the first coil 34, the second coil 35, and the third coil 36 are arranged concentrically and closely to one another.

[0032] The first variable capacitance circuit 37, the second variable capacitance circuit 38, and the third variable capacitance circuit constitute the circuit 21. The power receiving control circuit 24 controls the capacitance of the variable capacitance circuit 21 by switching on / off a plurality of switching elements 51-56. For example, the power receiving control circuit 24 increases the capacitance of the variable capacitance circuit 21 by increasing the number of switching elements that are turned on. Alternatively, the power receiving control circuit 24 decreases the capacitance of the variable capacitance circuit 21 by decreasing the number of switching elements that are turned on.

[0033] The configuration of the resonant circuits 25 of the power receiving unit 3 is not limited to the above and may be changed. For example, the number of resonant circuits 25 is not limited to three. The number of resonant circuits 25 may be less than three or more than three. The number of switching elements is also not limited to the above and may be changed. Some or all of the switching elements 51, 52 may be omitted in the first resonant circuit 31.

[0034] FIG. 3 is a perspective view showing the external configuration of the wireless power feeding system 1. As shown in FIG. 3, the wireless power feeding system 1 includes a kitchen counter 10. An electric device 4 is placed on the kitchen counter 10. FIG. 4 is an enlarged view of the electric device 4. As shown in FIG. 4, the electric device 4 includes the above-mentioned power receiving unit 3 and a load 5. The power receiving coil 6 of the power receiving unit 3 is placed, for example, in the bottom part 40 of the electric device 4. The load 5 is supplied with power from the power receiving unit 3, which the power receiving unit 3 receives from the power transmitting unit 2.

[0035] The electric device 4 may be, for example, a device that uses driving force, such as a chopper, a food processor, a mixer, or a blender. In this case, the load 5 is a motor, and is driven by the power received by the power receiving unit 3. The load 5 may include a battery, and the battery may be charged by the power from the power receiving unit 3. The motor may be driven by the power from the battery. Alternatively, the motor may be driven directly by the power from the power receiving unit 3 without using a battery. The electric device 4 may be a handheld type or a stationary type.

[0036] Alternatively, the electrical appliance 4 may be a device that uses heat, such as a coffee maker, toaster, rice cooker, air fryer, or induction heater. In this case, the load 5 is a heater that generates heat using the power received by the power receiving unit 3. The heater may generate heat using power from a battery. The heater may also generate heat using power directly from the power receiving unit 3 without using a battery.

[0037] As shown in FIG. 3, the kitchen counter 10 includes a countertop 61. The kitchen counter 10 includes a sink 62. However, the kitchen counter 10 does not necessarily have to include the sink 62. The countertop 61 includes a flat surface 63. The electrical appliance 4 is placed on the flat surface 63. A wall portion 64 is provided on the flat surface 63. The wall portion 64 protrudes upward from the flat surface 63. The flat surface 63 includes a power supply surface 65 and a main body surface 66. The power supply surface 65 is located inside the wall portion 64. The main body surface 66 is located outside the wall portion 64. The power supply surface 65 is formed integrally with the main body surface 66. The power supply surface 65 is located flush with the main body surface 66.

[0038] The above-described power transmitting unit 2 is placed on the kitchen counter 10. The power transmitting coil 7 is placed below the flat surface 63. More specifically, the power transmitting coil 7 is placed below the power feeding surface 65. The power transmitting coil 7 is placed inside the countertop 61 and is placed close to the power feeding surface 65.

[0039] The wall portion 64 separates the power feeding surface 65 and the main body surface 66 on the flat surface 63. In other words, the wall portion 64 indicates the boundary between the installation range of the electric device 4 for supplying power from the power transmitting unit 2 to the power receiving unit 3 by wireless power feeding and the outside of the installation range on the flat surface 63. The wall portion 64 is formed integrally with the flat surface 63. However, the wall portion 64 may be separate from the flat surface 63. The wall portion 64 has a circular loop shape.

[0040] 5 is a top view showing the arrangement of the wall portion 64 and the power transmitting coil 7. As shown in FIG. 5, the wall portion 64 is arranged over a wider area on the flat surface 63 than the power transmitting coil 7. The wall portion 64 is arranged on the flat surface 63 outside an allowable installation range 67 of the power receiving coil 6 for supplying power from the power transmitting unit 2 to the power receiving unit 3 by wireless power transfer. When the outer periphery of the power receiving coil 6 is arranged within the allowable installation range 67, the power transmission efficiency from the power transmitting unit 2 to the power receiving unit 3 is maintained at or above a predetermined threshold.

[0041] The allowable installation range 67 is a range with a radius of a predetermined allowable distance R1 from the center C1 of the power transmitting coil 7. The predetermined allowable distance R1 is greater than the radius R2 of the power transmitting coil 7. The predetermined allowable distance R1 is, for example, 1.5 times the radius R2 of the power transmitting coil 7. In this case, the allowable length of positional misalignment between the center C1 of the power transmitting coil 7 and the center C2 of the power receiving coil 6 is up to 0.5 times the radius R2 of the power transmitting coil 7. However, the predetermined allowable distance R1 may be less than or greater than 1.5 times the radius R2 of the power transmitting coil 7. The predetermined allowable distance R1 is set so that the power transmission efficiency from the power transmitting unit 2 to the power receiving unit 3 is at least an appropriate value.

[0042] The power supply surface 65 is wider than the installation tolerance range 67. That is, the wall portion 64 is arranged to surround an area wider than the installation tolerance range 67. The distance between the wall portion 64 and the installation tolerance range 67 is set based on the outer dimensions of the electric device 4. For example, when the bottom portion 40 of the electric device 4 is arranged on the power supply surface 65, the distance between the wall portion 64 and the installation tolerance range 67 is set based on the outer dimensions of the bottom portion 40 of the electric device 4.

[0043] The distance between the wall 64 and the permissible installation range 67 is set so that the bottom 40 of the electric device 4 does not interfere with the wall 64 when the electric device 4 is placed at any position within the permissible installation range 67. In other words, the distance between the wall 64 and the permissible installation range 67 is set so that the electric device 4 is placed at any position within the wall 64 so that the electric device 4 is located within the permissible installation range 67. However, a certain degree of margin may be provided in the distance between the wall 64 and the permissible installation range 67.

[0044] The wireless power feeding system 1 according to the present embodiment described above supplies power to the electric device 4 without a power cable. This allows the user to use the electric device 4 without being hindered by a power cable. Furthermore, the electric device 4 can be easily replaced. This improves the user's comfort when using the electric device 4.

[0045] In the wireless power supply system 1, the power cable is not exposed on the countertop 61. Therefore, high waterproofing can be achieved. As a result, the electric device 4 can be used around the sink 62.

[0046] In the case of an electric device 4 that does not have a battery, when the electric device 4 falls over, the power receiving coil 6 moves away from the power transmitting coil 7, thereby stopping the power supply to the load 5. This allows the electric device 4 to be automatically stopped.

[0047] The location of the external power source 100 that supplies power to the power transmission unit 2 is not limited to the location where the electrical device 4 is used. This improves the degree of freedom in arranging the external power source 100.

[0048] The wall 64 indicates the boundary between the installation range of the electric device 4 for wireless power supply and the outside of the installation range. Therefore, compared to when the position of the power transmitting coil 7 is indicated, the user can easily grasp the range in which the electric device 4 should be placed.

[0049] The wall portion 64 protrudes from the flat surface 63. Therefore, if the electric device 4 is not correctly placed in the installation range for the electric device 4, the wall portion 64 causes the electric device 4 to be placed above the flat surface 63. This allows the user to easily determine whether the electric device 4 is correctly placed in the installation range for the electric device 4. Furthermore, the user does not need to be concerned about the position of the power transmitting coil 7, and can simply place the electric device 4 within the wall portion 64. This eliminates the need for the user to precisely align the electric device 4 with the power transmitting coil 7, ensuring sufficient power transmission efficiency.

[0050] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

[0051] The circuit configuration of the wireless power supply system 1 is not limited to that of the above embodiment and may be modified. For example, the configuration of the power receiving control unit 9 is not limited to that of the above embodiment and may be modified. The configuration of the power transmitting control unit 8 is not limited to that of the above embodiment and may be modified.

[0052] The wireless power supply system 1 may be placed in other locations, not limited to the kitchen counter 10. For example, the wireless power supply system 1 may be provided on a table, a desk, a workbench, etc. The flat surface 63 may be provided on the top surface of the table, desk, or workbench.

[0053] The shape of the wall portion 64 is not limited to that of the above embodiment and may be modified. For example, the wall portion 64 is not limited to a circular shape and may be an elliptical shape. Fig. 6 is a perspective view showing the wall portion 64 according to a modified example. Fig. 7 is a top view showing the arrangement of the wall portion 64 and the power transmitting coil 7 according to a modified example. As shown in Figs. 6 and 7, the wall portion 64 may have a polygonal shape such as a square.

[0054] The power receiving coil 6 is not limited to being placed at the bottom 40 of the electric device 4, but may be placed at other positions. For example, in the case of a handheld electric device 4, the power receiving coil 6 may be placed at the top or side of the electric device 4.

[0055] An indicator may be provided on the electric device 4 or the flat surface 63. The indicator may indicate the state of coupling between the power transmitting coil 7 and the power receiving coil 6. Alternatively, the indicator may indicate the state of charge of the battery of the electric device 4. [Industrial Applicability]

[0056] According to the present invention, in a wireless power feeding system, sufficient power transmission efficiency is ensured without requiring the user to precisely align the electric device and the power transmitting coil. [Explanation of symbols]

[0057] 1: Wireless power transfer system, 2: Power transmission unit, 3: Power receiving unit, 4: Electrical equipment, 6: Power receiving coil, 7: Power transmitting coil, 63: Flat surface, 64: Wall, 65: Power supply surface, 66: Main body surface, 67: Installation tolerance range

Claims

1. A wireless power feeding system that supplies power wirelessly to an electric device having a power receiving unit including a power receiving coil, a flat surface on which the electrical device is placed; a power transmitting unit including a power transmitting coil disposed below the flat surface and configured to supply power to the power receiving unit via the wireless power feeding; a wall portion that is disposed on the flat surface within a range wider than an allowable installation range of the power receiving coil, the power receiving coil receiving power being supplied from the power transmitting unit to the power receiving unit by the wireless power supply with a power transmission efficiency maintained at or above a predetermined threshold; and Equipped with a distance between the wall portion and the installation tolerance range is set so that the power receiving coil is located within the installation tolerance range when the electrical device is placed at an arbitrary location within the wall portion; Wireless power supply system.

2. The flat surface is a power supply surface located inside the wall portion; a main body surface located outside the wall portion; Including, The power supply surface is integrally formed with the main body surface. The wireless power supply system according to claim 1 .

3. The wall portion is integrally formed with the flat surface. The wireless power supply system according to claim 1 .

4. The flat surface is provided on a kitchen countertop. The wireless power supply system according to claim 1 .

5. an electric device having a power receiving unit including a power receiving coil; a flat surface on which the electrical device is placed; a power transmitting unit including a power transmitting coil disposed below the flat surface and configured to wirelessly supply power to the power receiving unit; a wall portion that is disposed on the flat surface within a range wider than an allowable installation range of the power receiving coil, the power receiving coil receiving power being supplied from the power transmitting unit to the power receiving unit by the wireless power supply with a power transmission efficiency maintained at or above a predetermined threshold; and Equipped with a distance between the wall portion and the installation tolerance range is set so that the power receiving coil is located within the installation tolerance range when the electrical device is placed at an arbitrary location within the wall portion; A wireless power supply system comprising:

6. The flat surface is a power supply surface located inside the wall portion; a main body surface located outside the wall portion; Including, The power supply surface is integrally formed with the main body surface. The wireless power supply system according to claim 5 .

7. The wall portion is integrally formed with the flat surface. The wireless power supply system according to claim 5 .

8. The flat surface is provided on a kitchen countertop. The wireless power supply system according to claim 5 .

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