Wireless Power Receiver

Abstract

This wireless power reception device (10) comprises a power reception coil (21), an electronic circuit (40), a load circuit (43), a magnetic sheet (50), and a case (100). The magnetic sheet (50) is arranged for the power reception coil (21). The case (100) is composed of a complex solid structure in which the power reception coil (21), the electronic circuit (40), the load circuit (43), and the magnetic sheet (50) are arranged. The power reception coil (21) has the shape having a plurality of curvatures that are three-dimensionally curved along the outer surface or inner surface of the case (100) of the solid structure. The magnetic sheet (50) is three-dimensionally disposed at a position surrounding the electronic circuit (40) and the load circuit (43) in the inner space of the power reception coil (21) so as to form a magnetic path of a main magnetic flux that is interlinked with the power reception coil (21) with respect to the magnetic field from the outside of the case (100) of the solid structure.

Description

[Technical Field]

[0001] The present invention relates to a wireless power receiving device having a complex three-dimensional structure. [Background technology]

[0002] In recent years, there has been a demand for wireless power reception and wireless charging in portable devices such as hearing aids, as these devices are highly convenient as they do not require battery replacement like disposable primary batteries.

[0003] Patent Document 1 describes a portable device with wireless power receiving and wireless charging functions. The portable device described in Patent Document 1 has a loop coil for receiving power formed along the outer wall of the housing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-161177 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the portable device has a complex three-dimensional structure such as a hearing aid, for example, using a circular receiving coil is limited by the shape of the three-dimensional structure, making it difficult to obtain sufficient receiving power. Furthermore, because the structure is complex, the receiving coil occupies a large space, making it impossible to place an electronic circuit board.

[0006] On the other hand, even if a three-dimensional receiving coil is formed that is curved along the surface or inner surface of a complex three-dimensional structure, the main magnetic flux for wireless power supply may not link with the receiving coil, or the magnetic flux vectors may be opposite, causing the magnetic fluxes to cancel each other out, making it difficult to realize a wireless power receiver that achieves high efficiency.

[0007] Furthermore, if the energy of the external magnetic field is increased in order to obtain sufficient receiving power while still having these issues, the unwanted electromagnetic noise generated in the electronic circuit will increase, which may cause the electronic circuit to malfunction or may cause excessive stress to be applied to electronic components, resulting in their destruction.

[0008] Therefore, an object of the present invention is to provide a wireless power receiving device that has a complex three-dimensional structure, yet is compact and achieves high power receiving efficiency, and suppresses malfunction and damage to electronic circuits. [Means for solving the problem]

[0009] The wireless power receiving device of the present invention includes a power receiving loop coil, an electronic circuit board, a load circuit, a magnetic sheet, and a housing. The electronic circuit board includes a power receiving circuit electrically connected to the power receiving loop coil. The load circuit includes a magnetic sheet that performs electrical operations using received power obtained from the power receiving circuit, and is disposed relative to the power receiving loop coil. The housing has a complex three-dimensional structure in which the power receiving loop coil, electronic circuit board, load circuit, and magnetic sheet are disposed.

[0010] Electronic components are mounted on the electronic circuit board and the load circuit. The power receiving loop coil has a shape that is curved three-dimensionally along the outer or inner surface of the three-dimensional housing, with multiple curvatures. The magnetic sheet is three-dimensionally arranged in the internal space of the power receiving loop coil at a position that surrounds the electronic circuit board and the load circuit so as to form a magnetic path for the main magnetic flux that links to the power receiving loop coil in response to the magnetic field from outside the three-dimensional housing. For the power receiving loop coil, the magnetic sheet increases the linkage magnetic flux, thereby increasing the received power in the power receiving circuit, and for the electronic circuit board, the magnetic sheet suppresses linkage of the main magnetic flux, thereby reducing the generation of unnecessary electromagnetic noise on the electronic circuit board.

[0011] With this configuration, even in a housing with a complex three-dimensional structure, the shape of the receiving loop coil is prevented from becoming small, while the magnetic sheet increases the linkage magnetic flux of the receiving coil and suppresses linkage of the main magnetic flux to the electronic circuit board. [Effects of the Invention]

[0012] According to this invention, despite being a complex three-dimensional structure, it is possible to achieve high power receiving efficiency while being compact, and while increasing the received power, it is possible to reduce the generation of unnecessary electromagnetic noise in the electronic circuit board and load circuit, thereby suppressing malfunction and damage to the electronic circuit. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a circuit diagram of a wireless power receiving device according to an embodiment of the present invention. [Figure 2] FIG. 2A is an external perspective view of the wireless power receiving device according to the first embodiment, and FIG. 2B is a perspective view showing the housing of FIG. 2A. [Figure 3] 3A, 3B, 3C, and 3D are four-sided views of the wireless power receiving device according to the first embodiment. [Figure 4] FIG. 4(A) is a perspective view showing a state in which a wireless power receiving device is placed on a power supply stand and power is supplied, and FIG. 4(B) is a view of this state as viewed in the y-axis direction. [Figure 5] FIG. 5(A) is an external perspective view of a wireless power receiving device according to a second embodiment, and FIG. 5(B) is a perspective view showing the housing of FIG. 5(A). [Figure 6] 6(A), 6(B), 6(C), and 6(D) are four-sided views of the wireless power receiving device according to the second embodiment. [Figure 7] FIG. 7(A) is a perspective view showing a state in which a wireless power receiving device is placed on a power supply stand and power is supplied, and FIG. 7(B) is a view of this state as viewed in the y-axis direction. [Figure 8] FIG. 8(A) is an external perspective view of a wireless power receiving device according to the third embodiment, and FIG. 8(B) is a perspective view showing the housing of FIG. 8(A). [Figure 9] 9(A), 9(B), 9(C), and 9(D) are four-sided views of a wireless power receiving device according to the third embodiment. [Figure 10]FIG. 10(A) is a perspective view showing a state in which a wireless power receiving device is placed on a power supply stand and power is supplied, and FIG. 10(B) is a view of this state as viewed in the z-axis direction. DETAILED DESCRIPTION OF THE INVENTION

[0014] [First embodiment] A wireless power receiving device according to a first embodiment of the present invention will be described with reference to the drawings.

[0015] (Circuit configuration of wireless power receiving device 10) (Connection configuration and general operation) Fig. 1 is a circuit diagram of a wireless power receiving device according to an embodiment of the present invention. As shown in Fig. 1, the wireless power receiving device 10 includes a receiving coil 21, a communication antenna 31, and an electronic circuit 40. The electronic circuit 40 includes a receiving circuit 41, a wireless communication circuit 42, a load circuit 43, a charge control circuit 44, and a secondary battery 45. Note that the communication antenna 31 and the wireless communication circuit 42 may be omitted.

[0016] The power receiving coil 21 is connected to the input terminal of the power receiving circuit 41. The power receiving coil 21, together with the capacitor of the power receiving circuit 41, constitutes a power receiving resonant circuit. The resonant frequency of the power receiving resonant circuit is set to the same frequency as the alternating magnetic field to which the power receiving coil 21 is coupled (the same as the drive frequency of the power feeding device that generates the alternating magnetic field). By setting the resonant frequency in this manner, an electromagnetic field resonant field can be formed between the power receiving coil 21 and the power feeding coil of the power feeding device, enabling highly efficient power reception. The frequency of the alternating magnetic field is preferably, for example, 6.78 MHz or 13.56 MHz in the ISM band.

[0017] The output terminal of the power receiving circuit 41 is connected to the input terminals of the load circuit 43 and the charge control circuit 44. The power receiving circuit 41 includes a resonance control circuit and a rectifier circuit. The resonance control circuit adjusts the power receiving resonance frequency. The rectifier circuit rectifies the output current of the power receiving coil 21 and outputs a DC current and a DC voltage to the load circuit 43 and the charge control circuit 44.

[0018] The output terminal of the charge control circuit 44 is connected to the secondary battery 45. The charge control circuit 44 receives the output of the power receiving circuit 41 and charges the secondary battery 45.

[0019] The secondary battery 45 is, for example, a thin battery. This makes it easy to accommodate the secondary battery 71 in the housing 100 (described later), and prevents the housing 100 from becoming too large. The secondary battery 45 is connected to the load circuit 43, and enables power supply to the load circuit 43. The secondary battery 71 corresponds to the "power storage device" of the present invention.

[0020] The load circuit 43 is driven by DC power from the power receiving circuit 41 or the secondary battery 45. The load circuit 43 is a circuit or the like that executes the functions of a device realized by the wireless power receiving device 10, and for example, if the wireless power receiving device 10 is a hearing aid, it is configured by a microphone, an amplifier circuit for audio signals, etc.

[0021] The wireless communication circuit 42 performs wireless communication with an external device (for example, a power supply device) through the communication antenna 31. The frequency of the wireless communication may be the same as or different from the power receiving frequency (the frequency of the alternating magnetic field). If the frequency of the wireless communication is the same as the power receiving frequency, the communication antenna 31 can be omitted and the power receiving coil 21 can also be used as the communication antenna.

[0022] (Structure of wireless power receiving device 10) Fig. 2(A) is an external perspective view of a wireless power receiving device according to a first embodiment, and Fig. 2(B) is a see-through perspective view of the housing of Fig. 2(A). Figs. 3(A), 3(B), 3(C), and 3(D) are four-view diagrams of the wireless power receiving device according to the first embodiment. Fig. 3(B) is a view from direction B of Fig. 3(A), Fig. 3(C) is a view from direction C of Fig. 3(A), and Fig. 3(D) is a view from direction D of Fig. 3(A). Note that in the following, to make the shape easier to understand, the x-axis, y-axis, and z-axis directions will be used for explanation, but the x-axis, y-axis, and z-axis simply refer to three axes that are perpendicular to each other.

[0023] As shown in Figures 2(A), 2(B), 3(A), 3(B), 3(C), and 3(D), the wireless power receiving device 10 includes a housing 100. The housing 100 has a shape that matches the shape of the auricle, but the following explanation focuses on the parts related to the key points of the invention.

[0024] Housing 100 includes first portion 110 and second portion 120. The outer shape of first portion 110 is larger than the outer shape of second portion 120. First portion 110 and second portion 120 have a cylindrical shape with rounded corners.

[0025] The first portion 110 and the second portion 120 are aligned in the x-axis direction and connected to each other. The connection between the first portion 110 and the second portion 120 is formed by a curved surface.

[0026] In this way, the housing 100 is a complex three-dimensional structure that includes multiple curved surfaces each having a different curvature.

[0027] The various circuit elements that realize the above-described circuit configuration are built into the housing 100, which has such a complex three-dimensional structure.

[0028] The power receiving coil 21 is a loop coil formed by winding a linear conductor a predetermined number of times. The power receiving coil 21 is disposed on the inner surface of the first portion 110 of the housing 100. The power receiving coil 21 may also be disposed on the outer surface of the first portion 110. In other words, the power receiving coil 21 has a shape that is curved three-dimensionally along the outer or inner surface of the three-dimensional housing 100 and has multiple curvatures.

[0029] More specifically, the power receiving coil 21 is arranged along a circumferential surface parallel to the x-axis direction on the inner surface of the first portion 110. In other words, the power receiving coil 21 is arranged so as to have a ring shape when the housing 100 is viewed in the x-axis direction.

[0030] By disposing the power receiving coil 21 in the first portion 110, the outer shape and central opening of the power receiving coil 21 can be made larger than when the power receiving coil 21 is disposed in the second portion 120.

[0031] The electronic circuit 40 is formed by an electronic circuit board. The electronic circuit board includes a plurality of electronic components and a base substrate on which the plurality of electronic components are mounted.

[0032] The base substrate is a multilayer laminate of insulating resin layers and conductor layers, and may be either a solid substrate or a flexible substrate.

[0033] The plurality of electronic components are circuit elements for configuring a power receiving circuit 41, a wireless communication circuit 42, a load circuit 43, a charge control circuit 44, and a secondary battery 45, respectively.

[0034] These electronic components are mounted on a base substrate to form an electronic circuit 40. The electronic circuit 40 is disposed approximately in the center of the interior of the housing 100.

[0035] The magnetic sheet 50 is cylindrical. The magnetic sheet 50 is disposed so as to enclose and cover the electronic circuit 40 (electronic circuit board). In other words, the magnetic sheet 50 is disposed between the power receiving coil 21 and the electronic circuit 40 (electronic circuit board). In this case, the magnetic sheet 50 is disposed so that its peripheral surface faces the power receiving coil 21. Note that it is preferable that the peripheral portion of the magnetic sheet 50 (the portion facing the power receiving coil 21) is disposed as close as possible to the power receiving coil 21 inside the housing 100.

[0036] With this configuration, the magnetic sheet 50 is three-dimensionally arranged in the internal space of the receiving coil 21 at a position surrounding the electronic circuit 40 (electronic circuit board) so as to form a magnetic path of the main magnetic flux that interlinks with the receiving coil 21 in response to the magnetic field from outside the three-dimensional housing 100.

[0037] Although not shown in the drawings, the power receiving coil 21 and the electronic circuit 40 are connected appropriately. This connection is made through a slit or the like formed in the magnetic sheet 50.

[0038] For example, the power receiving coil 21 is formed on an insulating flexible sheet, and this flexible sheet is connected to a base substrate that forms the electronic circuit 40. Alternatively, the flexible sheet and the base substrate may be integrally formed.

[0039] Furthermore, when the base substrate is a flexible substrate, the base substrate is formed by a first region where the power receiving coil 21 is formed and a second region where multiple electronic components are mounted. In this case, the number of laminated resin layers and conductor layers in the first region should be greater than the number of laminated resin layers and conductor layers in the second region. This allows the number of turns of the power receiving coil 21 to be increased, further improving power receiving efficiency.

[0040] (Placement on power supply stand 190 and power receiving mode) FIG. 4(A) is a perspective view showing a state in which a wireless power receiving device is placed on a power supply stand and power is supplied, and FIG. 4(B) is a view of this state as viewed in the y-axis direction.

[0041] As shown in FIGS. 4A and 4B, the wireless power receiver 10 is placed on a power supply stand 190 to receive power. The power supply stand 190 has a power supply surface 191. The power supply coil 199 is, for example, a planar spiral coil. The power supply coil 199 is disposed near the power supply surface 191 and is disposed parallel to the power supply surface 191. As a result, the magnetic flux generated by the current flowing through the power supply coil 199 is oriented in a direction substantially perpendicular to the power supply surface 191 near the power supply surface 191.

[0042] As shown in Figures 4(A) and 4(B), the wireless power receiving device 10 is placed on the power supply surface 191 of the power supply stand 190 so that the surface of the first part 110 opposite to the side connected to the second part 120 is close to (or abuts) the power supply surface 191.

[0043] As a result, the ring-shaped surface of the power receiving coil 21 is parallel to the plane of the power feeding coil 199. Therefore, the power receiving coil 21 is highly coupled to the magnetic flux generated by the current in the power feeding coil 199. As a result, a high receiving current is output from the power receiving coil 21.

[0044] Furthermore, the power receiving coil 21 is formed with an area that is large relative to the shape of the housing 100. Therefore, the output current of the power receiving coil 21 can be further increased.

[0045] 4(A) and 4(B), the above-described configuration allows the magnetic sheet 50 to form a magnetic path of the main magnetic flux at a position close to the inside of the power receiving coil 21. This increases the flux linkage with the power receiving coil 21, enabling an even higher power receiving current to be output.

[0046] In this way, the wireless power receiving device 10 can increase the received power and achieve high power receiving efficiency even if the housing 100 has a complex three-dimensional structure and is small in size.

[0047] Furthermore, as described above, the magnetic sheet 50 surrounds the electronic circuit 40, which prevents the main magnetic flux from interlinking with the electronic circuit 40. This allows the wireless power receiver 10 to reduce the generation of unwanted electromagnetic noise in the electronic circuit 40.

[0048] [Second embodiment] A wireless power receiving device according to a second embodiment of the present invention will be described with reference to the drawings.

[0049] Fig. 5(A) is an external perspective view of a wireless power receiving device according to a second embodiment, and Fig. 5(B) is a perspective view seen through the housing of Fig. 5(A). Fig. 6(A), Fig. 6(B), Fig. 6(C), and Fig. 6(D) are four-view diagrams of the wireless power receiving device according to the second embodiment. Fig. 6(B) is a view seen from direction B of Fig. 6(A), Fig. 6(C) is a view seen from direction C of Fig. 6(A), and Fig. 6(D) is a view seen from direction D of Fig. 6(A).

[0050] The wireless power receiver 10A according to the second embodiment differs from the wireless power receiver 10 according to the first embodiment in a power receiving coil 21A and a magnetic sheet 50A. The other configuration of the wireless power receiver 10A is the same as that of the wireless power receiver 10, and a description of similar parts will be omitted.

[0051] The power receiving coil 21A is a loop coil formed by winding a linear conductor a predetermined number of times. The power receiving coil 21A is disposed across the inner surfaces of the first portion 110 and the second portion 120 of the housing 100. The power receiving coil 21A may also be disposed on the outer surfaces of the first portion 110 and the second portion 120.

[0052] More specifically, the power receiving coil 21A is arranged along the circumferential surface parallel to the z-axis direction on the inner surfaces of the first portion 110 and the second portion 120. In other words, the power receiving coil 21A is arranged so as to have a ring shape when the housing 100 is viewed in the z-axis direction.

[0053] By arranging the power receiving coil 21A in this manner, the outer shape and central opening of the power receiving coil 21A can be enlarged to match the shape where the first portion 110 and the second portion 120 are connected.

[0054] The electronic circuit 40 is disposed approximately in the center inside the housing 100 .

[0055] The magnetic sheet 50A is cylindrical. The magnetic sheet 50A is disposed so as to enclose and cover the electronic circuit 40 (electronic circuit board). In other words, the magnetic sheet 50A is disposed between the power receiving coil 21A and the electronic circuit 40 (electronic circuit board). In this case, the magnetic sheet 50A is disposed so that its peripheral surface faces the power receiving coil 21A. Note that it is preferable that the peripheral portion of the magnetic sheet 50A (the portion facing the power receiving coil 21A) be disposed as close as possible to the power receiving coil 21A inside the housing 100.

[0056] With this configuration, the magnetic sheet 50A is three-dimensionally arranged in the internal space of the receiving coil 21A in a position surrounding the electronic circuit 40 (electronic circuit board) so as to form a magnetic path of the main magnetic flux that interlinks with the receiving coil 21A in response to the magnetic field from outside the three-dimensional housing 100.

[0057] (Placement on power supply stand 190 and power receiving mode) FIG. 7(A) is a perspective view showing a state in which a wireless power receiving device is placed on a power supply stand and power is supplied, and FIG. 7(B) is a view of this state as viewed in the y-axis direction.

[0058] As shown in Figures 7(A) and 7(B), the wireless power receiving device 10A is placed on the power supply stand 190 so that the direction in which the first part 110 and the second part 120 are connected is approximately parallel to the power supply surface 191, and the power receiving coil 21A and the annular surface are parallel to the plane of the power supply coil 199.

[0059] As a result, the power receiving coil 21A is highly coupled to the magnetic flux generated by the current in the power feeding coil 199. Therefore, a high power receiving current is output from the power receiving coil 21A.

[0060] Furthermore, power receiving coil 21A is formed with an area that is large relative to the shape of housing 100. Therefore, the output current of power receiving coil 21A can be further increased.

[0061] 7(A) and 7(B), the above-described configuration allows magnetic sheet 50A to form a magnetic path of the main magnetic flux (main magnetic path) at a position close to the inside of power receiving coil 21A, thereby increasing the flux linkage with power receiving coil 21A and enabling a higher power receiving current to be output.

[0062] In this way, the wireless power receiving device 10A can increase the received power and achieve high power receiving efficiency even if the housing 100 has a complex three-dimensional structure and is small in size.

[0063] Furthermore, as described above, the magnetic sheet 50A surrounds the electronic circuit 40, which prevents the main magnetic flux from interlinking with the electronic circuit 40. This allows the wireless power receiver 10A to reduce the generation of unwanted electromagnetic noise in the electronic circuit 40.

[0064] [Third embodiment] A wireless power receiving device according to a third embodiment of the present invention will be described with reference to the drawings.

[0065] Fig. 8(A) is an external perspective view of a wireless power receiving device according to a third embodiment, and Fig. 8(B) is a perspective view seen through the housing of Fig. 8(A). Figs. 9(A), 9(B), 9(C), and 9(D) are four-view diagrams of the wireless power receiving device according to the third embodiment. Fig. 9(B) is a view seen from direction B of Fig. 9(A), Fig. 9(C) is a view seen from direction C of Fig. 9(A), and Fig. 9(D) is a view seen from direction D of Fig. 9(A).

[0066] The wireless power receiver 10B according to the third embodiment differs from the wireless power receiver 10 according to the first embodiment in a power receiving coil 21B and a magnetic sheet 50B. The other configuration of the wireless power receiver 10B is the same as that of the wireless power receiver 10, and a description of similar parts will be omitted.

[0067] The power receiving coil 21B is a loop coil formed by winding a linear conductor a predetermined number of times. The power receiving coil 21B is disposed on the inner surfaces of the first portion 110 and the second portion 120 of the housing 100. The power receiving coil 21A may be disposed on the outer surfaces of the first portion 110 and the second portion 120.

[0068] More specifically, power receiving coil 21B is arranged along a peripheral surface parallel to the y-axis direction on the inner surfaces of first portion 110 and second portion 120. In other words, power receiving coil 21B is arranged so as to have a ring shape when housing 100 is viewed in the y-axis direction.

[0069] By arranging power receiving coil 21B in this manner, the outer shape and central opening of power receiving coil 21B can be made larger to match the shape where first portion 110 and second portion 120 are connected.

[0070] The electronic circuit 40 is disposed approximately in the center inside the housing 100 .

[0071] The magnetic sheet 50B is cylindrical. The magnetic sheet 50B is disposed so as to enclose and cover the electronic circuit 40 (electronic circuit board). In other words, the magnetic sheet 50B is disposed between the power receiving coil 21B and the electronic circuit 40 (electronic circuit board). In this case, the magnetic sheet 50B is disposed so that its peripheral surface faces the power receiving coil 21B. Note that it is preferable that the peripheral portion of the magnetic sheet 50B (the portion facing the power receiving coil 21B) be disposed as close as possible to the power receiving coil 21B inside the housing 100.

[0072] With this configuration, the magnetic sheet 50B is three-dimensionally arranged in the internal space of the power receiving coil 21B in a position surrounding the electronic circuit 40 (electronic circuit board) so as to form a magnetic path of the main magnetic flux that interlinks with the power receiving coil 21B in response to the magnetic field from outside the three-dimensional housing 100.

[0073] (Placement on power supply stand 190 and power receiving mode) FIG. 10(A) is a perspective view showing a state in which a wireless power receiving device is placed on a power supply stand and power is supplied, and FIG. 10(B) is a view of this state as viewed in the z-axis direction.

[0074] As shown in Figures 10(A) and 10(B), the wireless power receiving device 10B is placed on the power supply stand 190 so that the direction in which the first part 110 and the second part 120 are connected is approximately parallel to the power supply surface 191, and the power receiving coil 21B and the annular surface are parallel to the plane of the power supply coil 199.

[0075] As a result, power receiving coil 21B is highly coupled to the magnetic flux generated by the current in power feeding coil 199. Therefore, a high power receiving current is output from power receiving coil 21B.

[0076] Furthermore, power receiving coil 21B is formed with an area that is large relative to the shape of housing 100. Therefore, the output current of power receiving coil 21B can be further increased.

[0077] 10(A) and 10(B), the above-described configuration allows magnetic sheet 50B to form a magnetic path of the main magnetic flux (main magnetic path) at a position close to the inside of power receiving coil 21B, thereby increasing the flux linkage with power receiving coil 21B and enabling a higher power receiving current to be output.

[0078] In this way, the wireless power receiver 10B can increase the received power and achieve high power receiving efficiency even if the housing 100 has a complex three-dimensional structure and is small in size.

[0079] Furthermore, as described above, the magnetic sheet 50A surrounds the electronic circuit 40, which prevents the main magnetic flux from interlinking with the electronic circuit 40. This allows the wireless power receiver 10A to reduce the generation of unwanted electromagnetic noise in the electronic circuit 40.

[0080] In the above-described embodiment, a hearing aid is used as an example, but the shape of the housing of the wireless power receiving device is not limited to this, and the above-described configuration can be effectively applied to shapes that are different from simple three-dimensional shapes and that combine multiple three-dimensional shapes, and the above-described effects can be achieved.

[0081] In addition, in each of the above-described embodiments, the magnetic sheet is cylindrical. However, the magnetic sheet may be rectangular, cubic, elliptical, or other shapes depending on the winding shape of the power receiving coil 21.

[0082] <1> a receiving loop coil used for wireless power supply; an electronic circuit board including a power receiving circuit electrically connected to the power receiving loop coil; a load circuit that performs an electrical operation using the received power obtained from the power receiving circuit; a magnetic sheet disposed relative to the power receiving loop coil; a housing having a complex three-dimensional structure in which the power receiving loop coil, the electronic circuit board, the load circuit, and the magnetic sheet are arranged; Equipped with The electronic circuit board and the load circuit are mounted with electronic components, the power receiving loop coil has a shape that is curved three-dimensionally along an outer surface or an inner surface of the three-dimensional housing and has a plurality of curvatures, the magnetic sheet is three-dimensionally arranged in the internal space of the power receiving loop coil at a position surrounding the electronic circuit board and the load circuit so as to form a magnetic path of a main magnetic flux that interlinks with the power receiving loop coil in response to a magnetic field from outside the three-dimensional housing; The power receiving loop coil is provided with an increased interlinkage magnetic flux to increase the power received by the power receiving circuit, and the main magnetic flux is prevented from interlinking with the electronic circuit board and the load circuit to reduce the generation of unnecessary electromagnetic noise in the electronic circuit board and the load circuit. Wireless power receiving device.

[0083] <2> the power receiving circuit includes a power receiving resonant circuit configured with the power receiving loop coil and a resonant capacitor, and a resonant current is passed through the power receiving loop coil using the power receiving resonant circuit to form a magnetic path of the main magnetic flux that interlinks with the power receiving loop coil; <1> The wireless power receiving device according to claim 1.

[0084] <3> The magnetic sheet is arranged in a cylindrical shape. <1> or <2> The wireless power receiving device according to claim 1.

[0085] <4> The magnetic sheet is arranged in a rectangular parallelepiped shape. <1> or <2> The wireless power receiving device according to claim 1.

[0086] <5> The power receiving loop coil is formed on a first flexible circuit board. <1> ~ <4> 10. The wireless power receiving device according to claim 9, wherein

[0087] <6> The electronic circuit board is composed of a second flexible circuit board made of a multilayer laminate of a resin layer and a conductor layer. <1> ~ <5> 10. The wireless power receiving device according to claim 9, wherein

[0088] <7> The electronic circuit board is a first region that constitutes the power receiving loop coil; a second region in which the electronic component is mounted; Equipped with the number of laminations of the resin layers and the conductor layers in the first region is greater than the number of laminations of the resin layers and the conductor layers in the second region; The conductor layer in the first region and the conductor layer in the second region are electrically connected. <1> ~ <6> 10. The wireless power receiving device according to claim 9, wherein

[0089] <8> a power storage device that stores the received power, The power storage device is electrically connected to a predetermined electronic circuit of the load circuit. <1> ~ <7> 10. The wireless power receiving device according to claim 9, wherein

[0090] <9> The load circuit includes: a wireless communication circuit for performing wireless communication using the same frequency as the operating frequency of the power receiving device; <1> ~ <8> 10. The wireless power receiving device according to claim 9, wherein

[0091] <10> The load circuit includes: a wireless communication circuit for performing wireless communication using a frequency different from the operating frequency of the power receiving device; <1> ~ <8> 10. The wireless power receiving device according to claim 9, wherein

[0092] <11> The three-dimensional housing constitutes at least a part of a hearing aid. <1> ~ <10> 10. The wireless power receiving device according to claim 9, wherein [Explanation of symbols]

[0093] 10, 10A, 10B: Wireless power receiving device 21, 21A, 21B: receiving coil 31: Communication antenna 40:Electronic circuit 41: Power receiving circuit 42: Wireless communication circuit 43:Load circuit 44: Charging control circuit 45: Secondary battery 50, 50A, 50B: Magnetic sheet 71: Secondary battery 100: Housing 110: Part 1 120: Part 2 190: To the radio station 191: Phone interview 199:Give me electricity

Claims

1. a receiving loop coil used for wireless power supply; a resonant capacitor; an electronic circuit board including a power receiving circuit electrically connected to the power receiving loop coil and including a power receiving resonance circuit configured by the power receiving loop coil and the resonance capacitor; a load circuit that performs an electrical operation using the received power obtained from the power receiving circuit; a magnetic sheet disposed relative to the power receiving loop coil; a housing having a complex three-dimensional structure in which the power receiving loop coil, the electronic circuit board, the load circuit, and the magnetic sheet are arranged; Equipped with The electronic circuit board and the load circuit are mounted with electronic components, the power receiving loop coil has a shape that is curved three-dimensionally along an outer surface or an inner surface of the three-dimensional housing and has a plurality of curvatures, the magnetic sheet is three-dimensionally arranged in the internal space of the power receiving loop coil at a position surrounding the electronic circuit board and the load circuit so as to form a magnetic path of a main magnetic flux that interlinks with the power receiving loop coil in response to a magnetic field from outside the three-dimensional housing; a power receiving circuit configured to cause a resonant current to flow through the power receiving loop coil, thereby forming a magnetic path of the main magnetic flux that interlinks with the power receiving loop coil, thereby increasing the interlinkage magnetic flux and increasing the received power in the power receiving circuit; Furthermore, for the electronic circuit board and the load circuit, the peripheral surface of the magnetic sheet faces the power receiving loop coil to suppress linkage of the main magnetic flux, thereby reducing the generation of unnecessary electromagnetic noise in the electronic circuit board and the load circuit. Wireless power receiving device.

2. The magnetic sheet is arranged in a cylindrical shape. The wireless power receiving device according to claim 1 .

3. The magnetic sheet is arranged in a rectangular parallelepiped shape. The wireless power receiving device according to claim 1 .

4. the power receiving loop coil is formed of a first flexible circuit board; The wireless power receiving device according to claim 1 .

5. the electronic circuit board is composed of a second flexible circuit board made of a multilayer laminate of a resin layer and a conductor layer; The wireless power receiving device according to claim 1 .

6. The electronic circuit board is a first region that constitutes the power receiving loop coil; a second region in which the electronic component is mounted; Equipped with the number of laminated resin layers and conductor layers in the first region is greater than the number of laminated resin layers and conductor layers in the second region; The conductor layer in the first region and the conductor layer in the second region are electrically connected. The wireless power receiving device according to claim 1 .

7. a power storage device that stores the received power, The power storage device is electrically connected to a predetermined electronic circuit of the load circuit. The wireless power receiving device according to claim 1 .

8. The load circuit includes: a wireless communication circuit for performing wireless communication using the same frequency as the operating frequency of the power receiving device; The wireless power receiving device according to claim 1 .

9. The load circuit includes: a wireless communication circuit for performing wireless communication using a frequency different from the operating frequency of the power receiving device; The wireless power receiving device according to claim 1 .

10. The three-dimensional housing constitutes at least a part of a hearing aid. The wireless power receiving device according to claim 1 .

Images