JP2017005952A - Non-contact power transmission device, non-contact power reception device, and non-contact power transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission system capable of reducing radiation noise or electromagnetic interference in another electronic apparatus when common mode noise has been input to a power transmission coil.SOLUTION: A non-contact power transmission system 1 comprises a non-contact power transmission device 2 and a non-contact power reception device 3. The non-contact power transmission device 2 comprises: a power transmission side substrate 22 electrically connected to a power transmission coil 21; and a power transmission side metal magnetic sheet 23 that contains metal magnetic material as a main component and is disposed on the back surface side of the power transmission coil 21. The power transmission side metal magnetic sheet 23 is electrically connected to the ground of the power transmission side substrate 22. The non-contact power reception device 3 comprises: a power reception side substrate 32 electrically connected to a power reception coil 31; and a power reception side metal magnetic sheet 33 that contains metal magnetic material as a main component and is disposed on the back surface side of the power reception coil 31. The power reception side metal magnetic sheet 33 is electrically connected to the ground of the power reception side substrate 32.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a contactless power transmission device, a contactless power reception device, the contactless power transmission device, and a contactless power transmission system including the contactless power reception device.

  Conventionally, technology to transmit power (including signals) by electromagnetic induction of opposing coils, that is, two coils are placed close to each other, and magnetic flux generated by passing current through one coil is coupled to the other coil There is known a technique for transmitting power by causing the power to be generated. In recent years, using such technology (principle) (that is, using electromagnetic induction of adjacent coils), for example, a non-contact charger (non-contact power) for charging a mobile phone, a smartphone, a digital camera, etc. in a non-contact manner. (Transmission system) has been put into practical use (for example, see Patent Document 1).

  Here, Patent Document 1 includes a primary-side non-contact charging module (transmission-side non-contact charging module) and a secondary-side non-contact charging module (receiving-side non-contact charging module). A non-contact power transmission device (non-contact charging device) that performs power transmission from a primary-side non-contact charging module to a secondary-side non-contact charging module is disclosed.

  More specifically, the primary side non-contact charging module includes a primary side coil, a magnetic sheet, a resonance capacitor, and a power input unit. The power input unit is connected to a commercial power source as an external power source, receives power supply of about 100 to 240 V, converts it into a predetermined current (DC 12 V, 1 A), and supplies it to the primary coil. The primary coil generates a magnetic field according to its shape, number of turns, and supplied current.

  On the other hand, the secondary side non-contact charging module includes a secondary side coil, a magnetic sheet, a resonant capacitor, a rectifier circuit, and a power output unit. The secondary side coil receives the magnetic field generated from the primary side coil, converts the magnetic field into a predetermined current by electromagnetic induction action, and passes through the rectifier circuit and the power output unit of the secondary side non-contact charging module. Output to the outside. The rectifier circuit rectifies a predetermined current that is an alternating current and converts it into a predetermined current that is a direct current (DC 5 V, 1.5 A). The power output unit is an external output unit of the secondary side non-contact charging module, and supplies power to the electronic device connected to the secondary side non-contact charging module via the power output unit.

JP 2013-59195 A

  By the way, in the contactless power transmission device (contactless charging device) described above, when common mode noise is input to the primary side coil (power transmission side coil), the common mode noise is generated from the primary side coil and the secondary side coil. Instead of electromagnetic induction by the coil, it is considered that transmission is mainly performed by coupling due to parasitic capacitance generated according to both areas and distances.

  However, in the non-contact power transmission device (non-contact charging device) of Patent Document 1, for example, the parasitic capacitance generated between the primary-side non-contact charging module and the secondary-side non-contact charging module cannot be sufficiently obtained. There is a possibility that the return of the common mode noise from the secondary side non-contact charging module to the primary side non-contact charging module becomes insufficient. Therefore, the transmission path for common mode noise draws a large loop, which may cause radiation noise or electromagnetic interference to other electronic devices.

  The present invention has been made to solve the above-described problems, and is a non-contact type capable of reducing radiation noise and electromagnetic interference to other electronic devices when common mode noise is input to the power transmission coil. It aims at providing a power transmission device, a non-contact power receiving device, and a non-contact power transmission system.

  A non-contact power transmission device according to the present invention is configured to transmit power to a power receiving coil by electromagnetic induction when the power receiving coil is disposed opposite to the power receiving coil, and to be electrically connected to the power transmitting coil. A power transmission side substrate that supplies power to the power transmission coil, and a power transmission side metal magnetic sheet that is mainly composed of a metal magnetic material and is disposed on the back side of the power transmission coil. It is electrically connected to the ground.

  According to the non-contact power transmission device according to the present invention, a metal magnetic material having high conductivity and high magnetic permeability is the main component, and the back side of the power transmission coil (that is, the surface opposite to the surface facing the power reception coil of the power transmission coil). The power transmission side metal magnetic sheet is electrically connected to the ground of the power transmission side board. Therefore, when the power receiving coil is disposed facing the power transmitting coil, the transmitting metal magnetic sheet behaves as a capacitor, and is capacitively coupled with, for example, the power transmitting coil, the power receiving coil, the ground of the power receiving side substrate, and the like. Therefore, the common mode noise input to the power transmission coil can be effectively returned (returned) to the ground of the power transmission side substrate. Therefore, the transmission path (loop) for common mode noise can be shortened. As a result, when common mode noise is input to the power transmission coil, it is possible to reduce radiation noise and electromagnetic interference to other electronic devices.

  In the non-contact power transmission apparatus according to the present invention, it is preferable that the ground surface of the power transmission side substrate is exposed, and the power transmission side metal magnetic sheet is electrically connected to the ground surface.

  In this case, the ground surface of the power transmission side substrate is exposed, and the power transmission side metal magnetic sheet is electrically connected to the ground surface. Therefore, the contact area between the power transmission side metal magnetic sheet and the ground can be increased. Accordingly, it is possible to further enhance the noise reduction effect when common mode noise is input to the power transmission coil.

  In the non-contact power transmission device according to the present invention, it is preferable that the power transmission side metal magnetic sheet and the ground of the power transmission side substrate are electrically connected by screws.

  In this case, the power transmission side metal magnetic sheet is electrically connected to the ground of the power transmission side substrate by screws. Therefore, the power transmission side metal magnetic sheet can be more firmly connected to the ground.

  The contactless power receiving device according to the present invention is configured to receive power from a power transmission coil by electromagnetic induction and to be electrically connected to the power receiving coil when the power transmitting coil is arranged opposite to the power receiving coil. A power receiving side substrate to which the received power is supplied; and a power receiving side metal magnetic sheet mainly composed of a metal magnetic material and disposed on the back side of the power receiving coil. The power receiving side metal magnetic sheet is provided on the power receiving side substrate. It is electrically connected to the ground.

  According to the non-contact power receiving apparatus according to the present invention, a metal magnetic material having high conductivity and magnetic permeability is the main component, and the back side of the power receiving coil (that is, the surface opposite to the surface facing the power transmitting coil of the power receiving coil). And the power receiving side metal magnetic sheet is electrically connected to the ground of the power receiving side substrate. For this reason, the power-receiving-side metal magnetic sheet and the ground of the power-receiving-side substrate are connected to form an integral conductor, and the capacity increases, so that the return of common mode noise to the ground of the power-transmitting-side substrate can be enhanced. As a result, when common mode noise is input to the power transmission coil, it is possible to reduce radiation noise and electromagnetic interference to other electronic devices.

  A contactless power transmission system according to the present invention includes any one of the above contactless power transmission devices and the contactless power reception device.

  According to the non-contact power transmission system according to the present invention, since any one of the non-contact power transmission devices and the non-contact power reception device is provided, common mode noise is input to the power transmission coil as described above. In this case, it is possible to reduce radiation noise and electromagnetic interference to other electronic devices.

  In the non-contact power transmission system according to the present invention, it is preferable that the power transmission side substrate is disposed on the back side of the power transmission side metal magnetic sheet, and the power reception side substrate is disposed on the side of the power reception side metal magnetic sheet.

  In this case, since the power transmission side substrate is disposed on the back side of the power transmission side metal magnetic sheet (that is, on the surface opposite to the surface facing the power transmission coil of the power transmission side metal magnetic sheet), non- The contact power transmission device can be downsized (the area can be reduced). On the other hand, since the power receiving side substrate is arranged on the side of the power receiving side metal magnetic sheet (that is, arranged side by side), the non-contact power receiving device can be made thin.

  According to the present invention, in the contactless power transmission device, the contactless power reception device, and the contactless power transmission system including the contactless power transmission device and the contactless power reception device, common mode noise is input to the power transmission coil. In this case, it is possible to reduce radiation noise and electromagnetic interference to other electronic devices.

It is a perspective view showing composition of a non-contact electric power transmission system concerning an embodiment. It is a figure which shows the attachment method of the metal magnetic sheet in the non-contact electric power transmission apparatus which comprises the non-contact electric power transmission system which concerns on embodiment. It is a perspective view which shows the simulation model of a non-contact electric power transmission system. It is a top view which shows the simulation model of the non-contact electric power transmission apparatus which comprises a non-contact electric power transmission system. It is a figure which shows the observation surface of simulation. It is a figure which shows an example of the simulation result of each magnetic field distribution of the non-contact electric power transmission system which concerns on embodiment, and a comparative example. It is the side view which showed typically the structure of the non-contact electric power transmission system which concerns on a modification. (A) is the side view which showed typically the structure of the non-contact electric power transmission system with which the power transmission side metal magnetic sheet 23 was connected to the ground of the power transmission side board | substrate 22. FIG. (B) is the figure which showed typically the transmission path | route of the common mode noise in the non-contact electric power transmission system of (a). It is the figure which showed typically the transmission path | route of the common mode noise in a comparative example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts. Moreover, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

  First, the configuration of the signal transmission communication body 1 according to the embodiment will be described using FIG. 1 and FIG. 2 together. FIG. 1 is a diagram illustrating an overall configuration of a non-contact power transmission system 1. Moreover, FIG. 2 is a figure which shows the attachment method of the metal magnetic sheet 23 in the non-contact electric power transmission apparatus 2 which comprises the non-contact electric power transmission system 1. FIG. Here, normally, the power transmission side of this system is arranged in a case such as a charger, and the power reception side is arranged in a case such as a portable device. However, these cases are omitted in FIG. Indicated.

  The non-contact power transmission system 1 is a system that transmits and receives power (including signals) in a non-contact manner by electromagnetic induction of opposing coils (a power transmission coil 21 and a power reception coil 31). The power receiving device 3 is provided.

  The non-contact power transmission device (module) 2 mainly includes a power transmission coil 21, a power transmission side substrate 22, and a power transmission side metal magnetic sheet 23.

  The power transmission coil 21 transmits electric power to the power reception coil 31 by electromagnetic induction when the power reception coil 31 is arranged to face in a non-contact state. The power transmission coil 21 is, for example, a planar coil in which conductive wires are wound in a planar shape from the center toward the outside so as to draw a vortex in a circle. The power transmission coil 21 generates a magnetic field according to its shape, number of turns, and supplied power (current). In addition, as a conductive wire, a polyurethane copper wire, a polyester copper wire, an enameled copper wire etc. can be used, for example. As a coil shape, a square shape, an oval shape, etc. may be sufficient besides circular shape. .

  The power transmission side substrate 22 is electrically connected to the power transmission coil 21 and includes a power transmission circuit for applying a high-frequency AC voltage to the power transmission coil 21. The power transmission side substrate 22 supplies power to be transmitted (high frequency AC voltage) to the power transmission coil 21. Note that an IC that can be a noise source is mounted on the power transmission side substrate 22. Moreover, the power transmission side board | substrate 22 is arrange | positioned at the back side (namely, surface on the opposite side of the surface facing the power transmission coil 21 of the power transmission side metal magnetic sheet 23) of the power transmission side metal magnetic sheet 23 mentioned later.

  The power transmission-side metal magnetic sheet 23 is a sheet-like member that has a metal magnetic material having high conductivity and magnetic permeability, such as iron, nickel, cobalt, etc., and is formed in a rectangular shape. The power transmission side metal magnetic sheet 23 is disposed on the back side of the power transmission coil 21 (that is, the surface opposite to the surface facing the power reception coil 31 of the power transmission coil 21). Therefore, the power transmission side metal magnetic sheet 23 is disposed between the power transmission coil 21 and the power transmission side substrate 22.

  The power transmission side metal magnetic sheet 23 is electrically connected to the ground of the power transmission side substrate 22. More specifically, in the power transmission side substrate 22, as shown in FIG. 2, for example, the resist is removed to expose the ground surface 221, and the power transmission side metal magnetic sheet 23 is electrically connected to the ground surface 221. Connected to. Furthermore, the power transmission side metal magnetic sheet 23 and the ground of the power transmission side substrate 22 (the ground 222 around the screw hole) can be electrically connected by a plurality (four in FIG. 2) of metal screws 50. preferable. That is, when the screw 50 is screwed, it is preferable that the ground 222 on the side surface of the screw hole formed in the power transmission side substrate 22 and the side surface of the metal screw 50 are in contact with each other and electrically connected. At that time, the power transmission side metal magnetic sheet 23 is fixed to the housing 60 by the screw 50 together with the power transmission side substrate 22. Thus, since the fixed pressure is applied between the power transmission side metal magnetic sheet 23 and the power transmission side board | substrate 22 by screwing, the efficiency of electric power transmission improves. The power-transmission-side metal magnetic sheet 23 can be connected by a method such as soldering or bonding with a conductive tape in addition to screwing. By arranging the power transmission side metal magnetic sheet 23, the electromagnetic coupling with the power receiving coil 31 is strengthened, and the efficiency of power transmission is improved.

  On the other hand, the non-contact power receiving device (module) 3 mainly includes a power receiving coil 31, a power receiving side substrate 32, and a power receiving side metal magnetic sheet 33.

  The power receiving coil 31 receives electric power from the power transmitting coil 21 by electromagnetic induction when the power transmitting coil 21 is arranged to face in a non-contact state. Similarly to the power transmission coil 21 described above, the power reception coil 31 is, for example, a planar coil in which a conductive wire is wound in a planar shape from the center to the outside so as to draw a vortex in a circular shape. In addition to the circular shape, the coil shape may be a square shape, an oval shape, or the like.

  The power receiving side substrate 32 is electrically connected to the power receiving coil 31 via the conductive connecting portion 34, and the power received by the power receiving coil 31 is supplied. More specifically, the power receiving side substrate 32 has a rectifier circuit, a regulator circuit, and the like, rectifies the received power (high frequency current / voltage), and then regulates and outputs it to a predetermined voltage ( Alternatively, the connected secondary battery or the like is charged). In addition, it is preferable that the power receiving side board | substrate 32 is arrange | positioned beside the power receiving side metal magnetic sheet 33 mentioned later (arranged horizontally).

  Similarly to the power transmission side metal magnetic sheet 23 described above, the power reception side metal magnetic sheet 33 is a rectangular sheet mainly composed of a metal magnetic material having high conductivity and high permeability, such as iron, nickel, cobalt, and the like. Shaped member. The power receiving side metal magnetic sheet 33 is disposed on the back side of the power receiving coil 31 (that is, the surface opposite to the surface facing the power transmitting coil 21 of the power receiving coil 31). Further, from the viewpoint of reducing the thickness of the device, the power receiving side metal magnetic sheet 33 is preferably disposed on the side (side by side) of the power receiving side substrate 32.

  The power receiving side metal magnetic sheet 33 is electrically connected to the ground of the power receiving side substrate 32 through the connecting portion 34. As in the case of the non-contact power transmission apparatus 2 described above, the power receiving side metal magnetic sheet 33 is disposed between the power receiving coil 31 and the power receiving side substrate 32 and is brought into contact with the ground surface of the power receiving side substrate 32. It is good also as a structure fixed with a screw | thread. By arranging the power receiving side metal magnetic sheet 33, the electromagnetic coupling with the power transmission coil 21 is strengthened, and the efficiency of power transmission is improved.

  By being configured as described above, the power transmission coil 21 and the power reception coil 31 are placed so as to face each other in a non-contact state, and a high-frequency alternating voltage (current) is applied to the power transmission coil 21, so that the power transmission coil is electromagnetically induced. Power is transmitted from 21 to the power receiving coil 31 in a contactless manner. In that case, that is, when the power receiving coil 31 is arranged opposite to the power transmitting coil 21, the power transmitting side metal magnetic sheet 23 and the power receiving side metal magnetic sheet 33 behave as capacitors (or a part thereof), for example, both In addition to the parasitic capacitance formed between the coils 21 and 31 and between the substrates 22 and 32, for example, between the metal magnetic sheets 23 and 33, or between the power transmission side metal magnetic sheet 23 and the power transmission coil 21. Parasitic capacitance also occurs between the power transmission side metal magnetic sheet 23 and the power reception coil 31 and between the power transmission coil 21 and the power reception side substrate 32. Therefore, the parasitic capacitance is increased, and the common mode noise input to the power transmission coil 21 can be effectively returned (returned) to the ground of the power transmission side substrate 22. Therefore, the transmission path (loop) of common mode noise is shortened (minimized).

  Here, in order to confirm the noise countermeasure effect of the non-contact power transmission system 1 according to the present embodiment, the magnetic field distribution was analyzed using a three-dimensional electromagnetic field simulation. Then, next, referring also to FIGS. 3 to 6, each of the non-contact power transmission system 1 according to the present embodiment and the comparative example (when the metal magnetic sheets 23 and 33 are not connected to the ground). The noise reduction effect (magnetic field distribution) will be described by showing simulation results.

  Here, in the simulation, as shown in FIGS. 3 and 4, as a model of the present embodiment, iron is used for the metal magnetic sheet material, and the power transmission side metal magnetic sheet 23 and the power reception are connected via the connection parts 24 and 34. The side metal magnetic sheet 33 was set to be connected to the ground. On the other hand, as a model of the comparative example, iron was used as the metal magnetic sheet material, and the metal magnetic sheets 23 and 33 and the ground were not electrically connected. Further, in both the non-contact power transmission device 2 and the non-contact power reception device 3, the coils (the power transmission coil 21 and the power reception coil 31) and the substrates (the power transmission side substrate 22 and the power reception side substrate 32) are arranged side by side.

  And common mode noise was inputted into power transmission coil 21, and each magnetic field distribution was observed. As shown in FIG. 5, the observation plane is set so that the y direction is parallel to the surfaces of the power transmission side substrate 22 and the power reception side substrate 32, and the electromagnetic field in the xz plane, that is, the power transmission side substrate 22. The spread of the electromagnetic field returning (returning) through the parasitic capacitance of the power receiving side substrate 32 was analyzed.

  FIG. 6 shows simulation results (magnetic field distribution) of the non-contact power transmission system 1 according to the present embodiment and the comparative example (when the metal magnetic sheets 23 and 33 are not connected to the ground). In FIG. 6, the simulation result (magnetic field distribution) of the non-contact power transmission system 1 according to the present embodiment is shown on the right side, and the simulation result (magnetic field distribution) of the comparative example is shown on the left side.

  As shown in FIG. 6, in this embodiment (right image), it was confirmed that the expansion of the magnetic field was reduced compared to the comparative example (left image). That is, in the present embodiment, it is confirmed that the common mode noise loop is shortened (minimized), thereby reducing the spread of the magnetic field and reducing radiated noise and electromagnetic interference (interference) with other electronic devices. It was done.

  According to the non-contact power transmission apparatus 2 according to the present embodiment, the metal magnetic material having high conductivity and magnetic permeability is a main component, and the power transmission side metal magnetic sheet 23 disposed on the back side of the power transmission coil 21 is provided. The power transmission side metal magnetic sheet 23 is electrically connected to the ground of the power transmission side substrate 22. Therefore, when the power receiving coil 31 is disposed opposite to the power transmitting coil 21, the power transmitting side metal magnetic sheet 23 behaves as a capacitor (or a part thereof), for example, the power transmitting coil 21, the power receiving coil 31, and the power receiving side substrate. Capacitive coupling with 32 grounds. Therefore, the common mode noise input to the power transmission coil 21 can be effectively returned (returned) to the ground of the power transmission side substrate 22. Therefore, the transmission path (loop) of common mode noise is shortened (minimized). As a result, when common mode noise is input to the power transmission coil 21, radiation noise and electromagnetic interference to other electronic devices can be reduced.

  According to this embodiment, the ground surface 221 of the power transmission side substrate 22 is exposed, and the power transmission side metal magnetic sheet 23 is electrically connected to the ground surface 221. Therefore, the contact area between the power transmission side metal magnetic sheet 23 and the ground can be enlarged. Therefore, it is possible to further enhance the noise reduction effect when common mode noise is input to the power transmission coil 21.

  According to the present embodiment, the power transmission side metal magnetic sheet 23 is electrically connected to the ground of the power transmission side substrate 22 by the screw 50. Therefore, the power transmission side metal magnetic sheet 23 can be more firmly connected to the ground.

  According to the non-contact power receiving device 3 according to the present embodiment, a metal magnetic material having a high conductivity and magnetic permeability is a main component, and the power receiving side metal magnetic sheet 33 disposed on the back side of the power receiving coil 31 is provided. The power receiving side metal magnetic sheet 33 is electrically connected to the ground of the power receiving side substrate 32. Therefore, the power-receiving-side metal magnetic sheet 33 and the ground of the power-receiving-side substrate 32 are connected to become an integral conductor, and the capacity is increased, thereby strengthening the return of common mode noise to the ground of the power-transmitting-side substrate 21. Can do. As a result, when common mode noise is input to the power transmission coil 21, radiation noise and electromagnetic interference to other electronic devices can be reduced.

  According to the non-contact power transmission system 1 according to the present embodiment, since the non-contact power transmission device 2 and the non-contact power reception device 3 are provided, the common mode noise is generated in the power transmission coil 21 as described above. When is input, it is possible to reduce radiation noise and electromagnetic interference to other electronic devices.

  According to the present embodiment, since the power transmission side metal magnetic sheet 23 is disposed between the power transmission coil 21 and the power transmission side substrate 22, the contactless power transmission device 2 can be reduced in size (reduction in installation area). Can do. On the other hand, since the power-receiving-side metal magnetic sheet 33 is disposed on the side (that is, side by side) of the power-receiving-side substrate 32, the non-contact power receiving device 3 can be made thin.

(Modification)
Next, the configuration of a non-contact power transmission system 1B according to a modification will be described with reference to FIG. FIG. 7 is a side view schematically showing the configuration of the non-contact power transmission system 1B according to the modification. That is, in the above-described embodiment, the power transmission side metal magnetic sheet 23 is connected to the ground of the power transmission side substrate 22 and the power reception side metal magnetic sheet 33 is connected to the ground of the power reception side substrate 32. Only the sheet 23 may be connected to the ground of the power transmission side substrate 22, and the power reception side metal magnetic sheet 33 may not be connected to the ground of the power reception side substrate 32. In addition, since the other structure is the same as that of the non-contact electric power transmission system 1 mentioned above, it abbreviate | omits detailed description here.

  Here, in FIGS. 8B and 9, transmission of common mode noise in the non-contact power transmission system 1 </ b> B (see FIG. 8A) in which the power transmission side metal magnetic sheet 23 is connected to the ground of the power transmission side substrate 22. The transmission path | route of the common mode noise in a path | route and a comparative example (system in which the power transmission side metal magnetic sheet 23 is not connected to the ground of the power transmission side board | substrate 22) is shown typically. As shown in FIG. 9, in the comparative example, the common mode noise transmission path draws a large loop. Therefore, there is a risk of causing radiation noise or electromagnetic wave interference with other electronic devices. On the other hand, as shown in FIG. 8B, when the power transmission side metal magnetic sheet 23 is connected to the ground of the power transmission side substrate 22, the power transmission side metal magnetic sheet 23 is connected to the ground of the power transmission side substrate 22. As the parasitic capacitance increases, the common mode noise loop (transmission path) is shortened (shortened).

  Therefore, also according to this modification, as described above, when common mode noise is input to the power transmission coil 21, it is possible to reduce radiation noise and electromagnetic interference to other electronic devices.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, the shape and number of turns of the power transmission coil 21 and the power reception coil 31, the shape of the power transmission side metal magnetic sheet 23 and the power reception side metal magnetic sheet 33, the connection form with the ground, and the like are not limited to the above embodiments. It can be arbitrarily set according to desired characteristics.

  In the above embodiment, the power transmission side metal magnetic sheet 23 is disposed between the power transmission coil 21 and the power transmission side substrate 22, and the power reception side metal magnetic sheet 33 is disposed on the side of the power reception side substrate 32. The arrangement of 23 and 33 is not limited to the above embodiment. That is, for example, the power transmission side metal magnetic sheet 23 may be disposed on the side of the power transmission side substrate 22, and the power reception side metal magnetic sheet 33 may be disposed between the power reception coil 31 and the power reception side substrate 32.

  In the above embodiment, the case where the present invention is applied to an electromagnetic induction system has been described as an example. However, the present invention can also be applied to an electromagnetic field resonance system, for example.

DESCRIPTION OF SYMBOLS 1,1B Non-contact electric power transmission system 2 Non-contact electric power transmission apparatus 3, 3B Non-contact electric power reception apparatus 21 Power transmission coil 22 Power transmission side board | substrate 221 Ground surface 23 Power transmission side metal magnetic sheet 24 Connection part 31 Power reception coil 32 Power reception side board | substrate 33 Power reception Side metal magnetic sheet 34 Connection 50 Screw 60 Case

Claims (6)

When the power receiving coil is disposed opposite to the power receiving coil, the power transmitting coil transmits power to the power receiving coil by electromagnetic induction; and
A power transmission side board that is electrically connected to the power transmission coil and supplies power to the power transmission coil;
A metal power material as a main component, and a power transmission side metal magnetic sheet disposed on the back side of the power transmission coil,
The non-contact power transmission device, wherein the power transmission side metal magnetic sheet is electrically connected to a ground of the power transmission side substrate.   The contactless power transmission device according to claim 1, wherein a ground surface of the power transmission side substrate is exposed, and the power transmission side metal magnetic sheet is electrically connected to the ground surface.   The contactless power transmission device according to claim 2, wherein the power transmission side metal magnetic sheet and the ground of the power transmission side substrate are electrically connected by screws. A power receiving coil that receives power from the power transmitting coil by electromagnetic induction when the power transmitting coil is arranged oppositely;
A power receiving side substrate that is electrically connected to the power receiving coil and is supplied with the power received by the power receiving coil;
A power-receiving-side metal magnetic sheet mainly composed of a metal magnetic material and disposed on the back side of the power-receiving coil,
The non-contact power receiving apparatus, wherein the power receiving side metal magnetic sheet is electrically connected to a ground of the power receiving side substrate. The contactless power transmission device according to any one of claims 1 to 3,
A contactless power transmission system comprising: the contactless power receiving device according to claim 4. The power transmission side substrate is disposed on the back side of the power transmission side metal magnetic sheet,
The contactless power transmission system according to claim 5, wherein the power receiving side substrate is disposed on a side of the power receiving side metal magnetic sheet.

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