WO2014125731A1 - Wireless power transfer system - Google Patents

Wireless power transfer system Download PDF

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Publication number
WO2014125731A1
WO2014125731A1 PCT/JP2013/084007 JP2013084007W WO2014125731A1 WO 2014125731 A1 WO2014125731 A1 WO 2014125731A1 JP 2013084007 W JP2013084007 W JP 2013084007W WO 2014125731 A1 WO2014125731 A1 WO 2014125731A1
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Prior art keywords
electrode
plate electrode
power transmission
power
active
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PCT/JP2013/084007
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French (fr)
Japanese (ja)
Inventor
末定剛
高橋博宣
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株式会社村田製作所
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Priority to JP2015500115A priority Critical patent/JP5907307B2/en
Priority to CN201390001032.2U priority patent/CN204809991U/en
Publication of WO2014125731A1 publication Critical patent/WO2014125731A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/05—Circuit arrangements or systems for wireless supply or distribution of electric power using capacitive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields

Definitions

  • the present invention relates to a wireless power transmission system that transmits power from a power transmission device to a power reception device by an electric field coupling method.
  • Patent Document 1 As a wireless power transmission system, for example, an electric field coupling type wireless power transmission system disclosed in Patent Document 1 is known.
  • the active electrode and the passive electrode of the power transmission device and the active electrode and the passive electrode of the power reception device come close to each other through a gap, so that the two electrodes are capacitively coupled to each other, and the power transmission device to the power reception device. Power is transmitted.
  • the active electrode in each of the power transmission device and the power reception device, the active electrode is surrounded by the passive electrode, and the coupling capacitance between the passive electrodes is increased. Thereby, the spread of an unnecessary electric field is suppressed.
  • An object of the present invention is to provide a wireless power transmission system that can prevent unnecessary coupling between electrodes and increase power transmission efficiency.
  • the present invention relates to a wireless power transmission system that performs power transmission by a capacitive coupling method from the power transmission device to the power reception device in a state where the power reception device is mounted on the power transmission device.
  • a power transmission side circuit for applying an AC voltage to the first flat plate electrode and the second flat plate electrode, and the power receiving device includes a gap in the first flat plate electrode.
  • the third flat plate electrode interposed between the first flat plate electrode of the power transmitting device and the fourth flat plate electrode of the power receiving device has a larger area than the first flat plate electrode.
  • the fourth plate electrode can be reduced in stray capacitance. Thereby, unnecessary coupling between the electrodes can be suppressed, and the power transmission efficiency can be increased.
  • the distance between the second plate electrode and the third plate electrode is larger than the distance between the first plate electrode and the fourth plate electrode.
  • the present invention relates to a wireless power transmission system that performs power transmission by a capacitive coupling method from the power transmission device to the power reception device in a state where the power reception device is mounted on the power transmission device.
  • a second flat plate electrode provided on substantially the same plane as the first flat plate electrode, and a power transmission side circuit for applying an AC voltage to the first flat plate electrode and the second flat plate electrode
  • the power receiving device includes a third flat plate electrode facing the first flat plate electrode with a gap, and a second flat plate electrode facing the second flat plate electrode with a gap, and substantially the same as the third flat plate electrode.
  • a fourth flat plate electrode provided on a plane; and a power receiving side circuit connected to the third electrode and the fourth electrode, wherein the third flat plate electrode is the first flat plate electrode. Larger in area than the first plate electrode and the second Distance between the flat plate electrodes, and wherein the wider interval between the third flat plate electrode and the fourth plate electrodes.
  • the distance between the first flat plate electrode of the power transmitting device and the fourth flat plate electrode of the power receiving device is widened, and the stray capacitance generated between the electrodes can be reduced. Thereby, unnecessary coupling between the electrodes can be suppressed, and the power transmission efficiency can be improved.
  • the power transmission device includes a first shield electrode connected to a reference potential of the power transmission device
  • the power reception device includes a second shield electrode connected to a reference potential of the power reception device
  • the first The shield electrode and the second shield electrode are opposed to each other with the first plate electrode, the second plate electrode, the third plate electrode, and the fourth plate electrode interposed therebetween. preferable.
  • the first shield electrode and the second shield electrode can suppress noise radiation generated by electric field coupling between the first plate electrode and the third plate electrode. Further, since the third plate electrode is larger than the first plate electrode, stray capacitance generated between the first plate electrode and the second shield electrode can be suppressed, and unnecessary coupling can be avoided.
  • a distance between the first shield electrode and the third plate electrode is larger than a distance between the first plate electrode and the second shield electrode.
  • the first shield electrode may be electrically connected to the second electrode, and the second shield electrode may be electrically connected to the fourth electrode.
  • the shield electrode and the flat plate electrode can be formed from one member. Further, the first plate electrode and the third plate electrode can be surrounded by the plate electrode and the shield electrode, respectively, and noise radiation can be suppressed.
  • stray capacitance formed between the electrodes can be prevented and reduced, and unnecessary coupling between the electrodes can be prevented, so that the efficiency of power transmission from the power transmitting apparatus to the power receiving apparatus can be increased.
  • Circuit diagram of wireless power transmission system Sectional view in a state where the power receiving device is mounted on the power transmitting device Figure showing only the active and passive electrodes shown in FIG.
  • the figure which shows a part of circuit when stray capacitance arises between the active electrode of a power transmission apparatus, and the passive electrode of a power receiving apparatus Sectional view in a state where the power receiving device is mounted on the power transmitting device Plan view of active electrode and passive electrode of power transmission device and power reception device, respectively
  • FIG. 1 is a circuit diagram of a wireless power transmission system according to the present embodiment.
  • the wireless power transmission system 301 includes a power transmission device 101 and a power reception device 201.
  • the power receiving apparatus 201 includes a load RL.
  • the load RL is a battery module including a secondary battery and a charging circuit.
  • the power receiving apparatus 201 is a portable electronic device provided with the battery module, for example. Examples of portable electronic devices include mobile phones, PDAs, portable music players, notebook PCs, digital cameras, and the like.
  • the power receiving device 201 is placed on the power transmitting device 101, and the power transmitting device 101 charges the secondary battery of the power receiving device 201.
  • the power transmission device 101 includes a high-frequency oscillator OSC, a step-up transformer TG, and an inductor LG.
  • the high frequency voltage generation circuit OSC generates a high frequency voltage of, for example, 100 kHz to several tens of MHz.
  • the step-up circuit using the step-up transformer TG and the inductor LG steps up the voltage generated by the high-frequency voltage generation circuit OSC and applies it between the active electrode 11 and the passive electrode 12.
  • a capacitor indicated by a broken line in the drawing is a stray capacitance formed between the active electrode 11 and the passive electrode 12 or an actual component.
  • the active electrode 11 corresponds to the first plate electrode according to the present invention
  • the passive electrode 12 corresponds to the second plate electrode according to the present invention.
  • the power receiving device 201 is connected to the active electrode 21 and the passive electrode 22 and includes a step-down circuit using an inductor LL and a step-down transformer TL, a rectifier circuit 27 that converts the stepped-down AC voltage into a DC voltage, and a load RL.
  • a DC-DC converter 28 that outputs a DC voltage and a load RL are provided.
  • a capacitor indicated by a broken line in the drawing is a stray capacitance formed between the active electrode 21 and the passive electrode 22 or an actual component.
  • the active electrode 21 corresponds to the third plate electrode according to the present invention
  • the passive electrode 22 corresponds to the fourth plate electrode according to the present invention.
  • the power receiving device 201 is placed on the power transmitting device 101, and a voltage is applied between the active electrode 11 and the passive electrode 12 of the power transmitting device 101, so that the active electrodes 11, 21 and the passive electrodes 12 and 22 are capacitively coupled to generate an electric field. Then, power is transmitted from the power transmitting apparatus 101 to the power receiving apparatus 201 via this electric field. In the power receiving device 201, the AC voltage induced by power transmission is stepped down, then rectified and smoothed, and applied to the load RL.
  • the high-frequency oscillator OSC, the step-up transformer TG, the inductor LG, and the like are collectively referred to as the power transmission side circuit 10, and the inductor LL, the step-down transformer TL, the rectifier circuit 27, and the load RL are collectively referred to as the power reception side circuit 20.
  • FIG. 2 is a cross-sectional view of the power transmission apparatus 101 with the power reception apparatus 201 mounted thereon.
  • FIG. 2 also shows a plan view of the active electrodes 11 and 21 and the passive electrode 22 in a state where the power receiving device 201 is placed on the power transmitting device 101.
  • the power transmission device 101 has a resin casing, and a substantially rectangular active electrode 11 is provided in the resin layer 15 serving as a placement surface of the power transmission device 101 on which the power reception device 201 is placed.
  • the active electrode 11 may be attached to the back side (inside side) of the mounting surface.
  • a substantially rectangular passive electrode 12 is provided on the bottom surface of the power transmission device 101 on the side opposite to the mounting surface, and faces the active electrode 11.
  • the passive electrode 12 has a larger area than the active electrode 11, and the passive electrode 12 includes the active electrode 11 when viewed in plan.
  • the active electrode 11 is provided along the mounting surface of the power transmission device 101 and the passive electrode 12 is provided along the bottom surface of the power transmission device 101, the active electrode 11 and the passive electrode 12 are separated by the thickness of the power transmission device 101. ing. The active electrode 11 and the passive electrode 12 are electrically connected to the power transmission side circuit 10 described in FIG.
  • the power receiving device 201 has a resin casing, and when mounted, the power receiving device 201 has a substantially rectangular shape in the resin layer 25 that is a surface (hereinafter referred to as a back surface) of the power receiving device 201 that comes into contact with the mounting surface of the power transmitting device 101.
  • An active electrode 21 is provided.
  • the active electrode 21 has a larger area than the opposing active electrode 11, and the active electrode 21 includes the active electrode 11 when viewed in plan.
  • a substantially rectangular passive electrode 22 is provided on the surface of the power receiving device 201 opposite to the contact surface (hereinafter referred to as the front surface) and faces the active electrode 21.
  • the passive electrode 22 has substantially the same area as the passive electrode 12.
  • the passive electrode 22 has a larger area than the active electrode 21, and the passive electrode 22 has a shape including the active electrode 21 when viewed in plan.
  • the active electrode 21 and the passive electrode 22 are electrically connected to the power receiving side circuit 20 described in FIG.
  • FIG. 3 shows only the active electrodes 11 and 21 and the passive electrodes 12 and 22 shown in FIG.
  • Cs1 is a stray capacitance generated between the active electrode 11 and the passive electrode 22
  • Cs2 is a stray capacitance generated between the active electrode 21 and the passive electrode 12.
  • the interval between the active electrode 21 of the power receiving apparatus 201 and the passive electrode 12 of the power transmitting apparatus 101 is represented by T1
  • the interval between the active electrode 11 of the power transmitting apparatus 101 and the passive electrode 22 of the power receiving apparatus 201 is represented by T2.
  • the active electrodes 11 and 21 and the passive electrodes 12 and 22 are provided in the power transmitting apparatus 101 and the power receiving apparatus 201 so that the relationship of T2 ⁇ T1 is established.
  • the power receiving apparatus 201 is a portable electronic device and is required to be thin.
  • the power transmission device 101 is a charging device for portable electronic devices, and is not required to be as thin as the power reception device 201. Accordingly, the interval T1 can be increased, but the interval T2 is decreased. (At least T1> T2 tends to be satisfied.) By increasing the interval T1, the stray capacitance Cs2 can be reduced. Specifically, if one side of the active electrode 11 of the power transmission apparatus 101 is 50 to 80 mm and the active electrode 21 of the power reception apparatus 201 is about 100 mm (the active electrode 11 on the power transmission apparatus 101 side is the active electrode 21 on the power reception apparatus 201 side).
  • the stray capacitance CS2 When the distance between the active electrode 11 and the active electrode 12 is about 1 mm, the stray capacitance CS2 is almost zero. However, if the active electrode 21 has the same area as the active electrode 11 or a smaller area than the active electrode 11, a large stray capacitance Cs1 occurs when the interval T2 is narrowed. As an example of specific values of T1 and T2, T1 is 3.2 to 6.0 mm, and T2 is 1.2 to 2.5 mm.
  • FIG. 4 is a diagram illustrating a part of a circuit in the case where stray capacitance Cs1 is generated between the active electrode 11 of the power transmission device 101 and the passive electrode 22 of the power reception device 201.
  • the stray capacitance Cs1 is formed between the active electrode 11 and the passive electrode 22, a part of the power to be transmitted via the active electrodes 11 and 21 is also transmitted to the passive electrode 22 via the stray capacitance Cs1.
  • the power transmission via the stray capacitance Cs1 not only contributes to the power transmission from the power transmission apparatus 101 to the power reception apparatus 201, but also leads to an increase in loss, so that the power transmission efficiency from the power transmission apparatus 101 to the power reception apparatus 201 decreases. To do.
  • the active electrode 21 in order to suppress the generation of the stray capacitance Cs1, the active electrode 21 has a larger area than the active electrode 11, as shown in FIG.
  • the active electrode 21 serves as a barrier, and the stray capacitance Cs1 generated between the active electrode 11 and the passive electrode 22 is sufficiently suppressed.
  • the area of the active electrode 21 is made larger than the area of the active electrode 11, and the stray capacitance Cs1 is reduced by making the active electrode 21 include the active electrode 11 when viewed in plan. Indicated.
  • the present invention is not limited to this, and the area of the active electrode 21 is larger than the area of the active electrode 11, and at least the active electrode 21 has a sufficient parasitic capacitance Cs1 generated between the active electrode 11 and the passive electrode 22 when viewed in plan. Therefore, the active electrode 21 does not need to completely include the active electrode 11.
  • FIG. 5 is a cross-sectional view of the power transmitting apparatus 101 with the power receiving apparatus 201 mounted thereon.
  • FIG. 6 is a plan view of the active electrodes 11 and 21 and the passive electrodes 12 and 22 of the power transmitting apparatus 101 and the power receiving apparatus 201, respectively.
  • a rectangular active electrode 11 and a passive electrode 12 are provided on the same plane.
  • the external shape of the passive electrode 12 is larger than that of the active electrode 11, and a rectangular notch 12 ⁇ / b> A is formed at the center of the passive electrode 12.
  • the active electrode 11 is located in the notch 12A.
  • a shield electrode 13 connected to the reference potential of the power transmission device 101 is provided on the bottom surface of the power transmission device 101.
  • the shield electrode 13 has substantially the same size as the passive electrode 12 and faces the active electrode 11 and the passive electrode 12.
  • the shield electrode 13 shields noise radiation generated from the coupling portion such as the active electrode 11.
  • a substantially rectangular active electrode 21 and passive electrode 22 are provided on the same plane.
  • the passive electrode 22 has substantially the same size as the passive electrode 12, and a rectangular notch 22 ⁇ / b> A is formed at the center of the passive electrode 22.
  • the active electrode 21 is located in the notch 22A.
  • the active electrode 21 has a larger area than the opposing active electrode 11.
  • the interval between the active electrode 11 and the passive electrode 12 is represented by T3
  • the interval between the active electrode 21 and the passive electrode 22 is represented by T4.
  • the active electrodes 11 and 21 and the passive electrodes 12 and 22 are formed so that the relationship of T4 ⁇ T3 is established.
  • a shield electrode 23 connected to the ground potential (reference potential) of the power receiving device 201 is provided on the front surface of the power receiving device 201.
  • the shield electrode 23 has substantially the same size as the passive electrode 22 and faces the active electrode 21 and the passive electrode 22.
  • the shield electrode 23 shields noise radiation generated from the coupling portion such as the active electrode 21.
  • FIG. 7 shows only the active electrodes 11 and 21, the passive electrodes 12 and 22, and the shield electrodes 13 and 23 shown in FIG. 5.
  • Cs3 is a stray capacitance generated between the active electrode 11 and the shield electrode 23
  • Cs4 is a stray capacitance generated between the active electrode 21 and the shield electrode 13.
  • the device in the power transmission device 101 that is less demanded to be thin, the device can be thickened. Therefore, the interval between the active electrode 21 of the power reception device 201 and the shield electrode 13 of the power transmission device 101 can be widened. As a result, the stray capacitance Cs4 can be reduced.
  • the active electrode 21 has the same area as the active electrode 11 or a smaller area than the active electrode 11, it is necessary to reduce the thickness of the power receiving device 201. The distance between the shield electrode 23 and the shield electrode 23 is reduced, and a large stray capacitance Cs3 is generated. When the large stray capacitance Cs3 occurs, the active electrode 11 and the passive electrode 22 are capacitively coupled via the shield electrode 23 because the passive electrode 22 and the shield electrode 23 are connected to the reference potential.
  • the active electrode 21 is larger than the active electrode 11 and has a relationship of T4 ⁇ T3, so that the active electrode 21 becomes a barrier, and the active electrode 11 and the shield electrode 23
  • the stray capacitance Cs3 generated therebetween can be sufficiently suppressed.
  • the shield electrode 23 is connected to the reference potential of the power receiving device 201, and thus the reference of the power receiving device 201 via the shield electrode 23. Noise may be superimposed on the potential. In this case, a problem of causing a malfunction of the function of the power receiving apparatus 201 occurs. However, in this embodiment, since the stray capacitance Cs3 is suppressed, problems such as malfunctions can be avoided.
  • the active electrode 11 and the passive electrode 12 are formed on the same plane, and the active electrode 21 and the passive electrode 22 are formed on the same plane. Even if these electrodes are not on the same plane and are arranged so as to be back and forth with each other when viewed in a plan view, the same effect can be obtained as long as they have the aforementioned area relationship. it can.
  • stray capacitance (not shown) is also generated between the active electrode 11 and the passive electrode 22, the surfaces of the active electrode 11 and the passive electrode 22 are not opposed to each other, and the side surfaces of the electrodes are opposed to each other. Since the interval is wide, the stray capacitance is small and can be almost ignored.
  • FIG. 8 is a cross-sectional view of a power transmission device 101 and a power reception device 201 according to a modification of the second embodiment.
  • the power transmission device 101 may have a configuration in which the passive electrode 12 and the shield electrode 13 are connected by the connection electrode 14.
  • the active electrode 21 and the shield electrode 23 may be connected by the connection electrode 24.
  • the passive electrode 12, the shield electrode 13, and the connection electrode 14 may be formed of a single member, or the passive electrode 12, the shield electrode 13, and the connection electrode 14 may be separate members.
  • the passive electrode 22, the shield electrode 23, and the connection electrode 24 may be formed by one member, and the active electrode 21, the shield electrode 23, and the connection electrode 24 may be separate members.
  • the shield electrodes 13 and 23 may use the metal casings.
  • the active electrodes 11 and 21 and the passive electrodes 12 and 22 may be circular, for example.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Near-Field Transmission Systems (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A wireless power transfer system uses a capacitively-coupled method to transfer power from a power transmitting device (101) to a power receiving device (201), wherein the power transmitting device (101) and the power receiving device (201) have an active electrode (11) and an active electrode (21), respectively, facing each other and a passive electrode (12) and a passive electrode (22), respectively, facing each other. In the wireless power transfer system, the area of the active electrode (21) is larger than that of the active electrode (11). The passive electrode (12) and the passive electrode (22) face each other with the active electrodes (11, 21) interposed therebetween. This provides a wireless power transfer system capable of preventing unnecessary coupling between the electrodes and increasing the power transfer efficiency.

Description

ワイヤレス電力伝送システムWireless power transmission system
　本発明は、電界結合方式により送電装置から受電装置へ電力を伝送するワイヤレス電力伝送システムに関する。 The present invention relates to a wireless power transmission system that transmits power from a power transmission device to a power reception device by an electric field coupling method.
　ワイヤレス電力伝送システムとして、例えば、特許文献１に示す電界結合方式のワイヤレス電力伝送システムが知られている。このシステムでは、送電装置のアクティブ電極およびパッシブ電極と、受電装置のアクティブ電極およびパッシブ電極とが間隙を介して近接することにより、この二つの電極同士が容量性結合し、送電装置から受電装置へ電力が伝送される。特許文献１では、送電装置および受電装置それぞれにおいて、アクティブ電極をパッシブ電極で取り囲み、パッシブ電極間の結合容量を大きくする構成としている。これにより、不要な電場の広がりを抑制している。 As a wireless power transmission system, for example, an electric field coupling type wireless power transmission system disclosed in Patent Document 1 is known. In this system, the active electrode and the passive electrode of the power transmission device and the active electrode and the passive electrode of the power reception device come close to each other through a gap, so that the two electrodes are capacitively coupled to each other, and the power transmission device to the power reception device. Power is transmitted. In Patent Document 1, in each of the power transmission device and the power reception device, the active electrode is surrounded by the passive electrode, and the coupling capacitance between the passive electrodes is increased. Thereby, the spread of an unnecessary electric field is suppressed.
特開２０１２－２１０１４６号公報JP 2012-210146 A
　しかしながら、特許文献１に記載のように、アクティブ電極をパッシブ電極で覆う構成とした場合、送電装置（または受電装置）のアクティブ電極と、受電装置（または送電装置）のパッシブ電極とが近接し、不要な結合容量が大きくなる場合がある。そして、この不要な結合容量によって、電力伝送効率が低下するといった問題が生じる。特に、薄型化が要求される携帯電話機などの受電装置においては、その薄型化に伴い、電極間の距離がより近接するため、電極間の不要な結合が発生する
　そこで、本発明の目的は、電極間の不要な結合を防止して、電力伝送効率を高めることができるワイヤレス電力伝送システムを提供することにある。 However, as described in Patent Document 1, when the active electrode is covered with a passive electrode, the active electrode of the power transmission device (or power reception device) and the passive electrode of the power reception device (or power transmission device) are close to each other, Unnecessary coupling capacity may increase. And the problem that electric power transmission efficiency falls by this unnecessary coupling capacity arises. In particular, in a power receiving device such as a mobile phone that is required to be thin, the distance between the electrodes becomes closer as the thickness is reduced, and therefore unnecessary coupling between the electrodes occurs. An object of the present invention is to provide a wireless power transmission system that can prevent unnecessary coupling between electrodes and increase power transmission efficiency.
　本発明は、送電装置に受電装置を載置した状態で、前記送電装置から前記受電装置へ、容量結合方式による電力伝送を行うワイヤレス電力伝送システムにおいて、前記送電装置は、第１の平板電極と、第２の平板電極と、前記第１の平板電極および前記第２の平板電極に交流電圧を印加する送電側回路と、を備え、前記受電装置は、前記第１の平板電極に間隙をおいて対向する第３の平板電極と、前記受電装置の基準電位に接続され、前記第２の平板電極に間隙をおいて対向する第４の平板電極と、前記第３の電極および前記第４の電極に接続された受電側回路と、を備え、前記第３の平板電極は、前記第１の平板電極よりも面積が大きく、前記第２の平板電極と前記第４の平板電極とは、間に前記第１の平板電極および前記第３の平板電極を介在させて対向していることを特徴とする。 The present invention relates to a wireless power transmission system that performs power transmission by a capacitive coupling method from the power transmission device to the power reception device in a state where the power reception device is mounted on the power transmission device. A power transmission side circuit for applying an AC voltage to the first flat plate electrode and the second flat plate electrode, and the power receiving device includes a gap in the first flat plate electrode. And a third plate electrode facing each other, a fourth plate electrode connected to a reference potential of the power receiving device and facing the second plate electrode with a gap, the third electrode, and the fourth electrode A power receiving side circuit connected to the electrode, wherein the third plate electrode has a larger area than the first plate electrode, and the second plate electrode and the fourth plate electrode are The first plate electrode and the third plate electrode Wherein the facing with intervening.
　この構成では、送電装置の第１の平板電極と受電装置の第４の平板電極の間に介在する第３の平板電極が第１の平板電極よりも面積が大きいことにより、第１の平板電極と第４の平板電極との間に形成される浮遊容量を低減ことができる。これにより、電極間の不要な結合を抑制することができ、電力伝送効率を高めることができる。 In this configuration, the third flat plate electrode interposed between the first flat plate electrode of the power transmitting device and the fourth flat plate electrode of the power receiving device has a larger area than the first flat plate electrode. And the fourth plate electrode can be reduced in stray capacitance. Thereby, unnecessary coupling between the electrodes can be suppressed, and the power transmission efficiency can be increased.
　前記第２の平板電極と前記第３の平板電極との間の距離は、前記第１の平板電極と前記第４の平板電極との間の距離より大きいことが好ましい。 It is preferable that the distance between the second plate electrode and the third plate electrode is larger than the distance between the first plate electrode and the fourth plate electrode.
　この構成では、第２の平板電極と第３の平板電極の間に生じる浮遊容量を抑えることができる。 In this configuration, stray capacitance generated between the second plate electrode and the third plate electrode can be suppressed.
　本発明は、送電装置に受電装置を載置した状態で、前記送電装置から前記受電装置へ、容量結合方式による電力伝送を行うワイヤレス電力伝送システムにおいて、前記送電装置は、第１の平板電極と、前記第１の平板電極と略同一平面上に設けられた第２の平板電極と、前記第１の平板電極および前記第２の平板電極に交流電圧を印加する送電側回路と、を備え、前記受電装置は、前記第１の平板電極に間隙をおいて対向する第３の平板電極と、前記第２の平板電極に間隙をおいて対向し、かつ、前記第３の平板電極と略同一平面上に設けられた第４の平板電極と、前記第３の電極および前記第４の電極に接続された受電側回路と、を備え、前記第３の平板電極は、前記第１の平板電極よりも面積が大きく、前記第１の平板電極と前記第２の平板電極との間隔は、前記第３の平板電極と前記第４の平板電極との間隔より広いことを特徴とする。 The present invention relates to a wireless power transmission system that performs power transmission by a capacitive coupling method from the power transmission device to the power reception device in a state where the power reception device is mounted on the power transmission device. A second flat plate electrode provided on substantially the same plane as the first flat plate electrode, and a power transmission side circuit for applying an AC voltage to the first flat plate electrode and the second flat plate electrode, The power receiving device includes a third flat plate electrode facing the first flat plate electrode with a gap, and a second flat plate electrode facing the second flat plate electrode with a gap, and substantially the same as the third flat plate electrode. A fourth flat plate electrode provided on a plane; and a power receiving side circuit connected to the third electrode and the fourth electrode, wherein the third flat plate electrode is the first flat plate electrode. Larger in area than the first plate electrode and the second Distance between the flat plate electrodes, and wherein the wider interval between the third flat plate electrode and the fourth plate electrodes.
　この構成では、送電装置の第１の平板電極と受電装置の第４の平板電極との間隔が広くなり、電極間に生じる浮遊容量を小さくできる。これにより、電極間の不要な結合を抑制でき、電力伝送効率が高められる。 In this configuration, the distance between the first flat plate electrode of the power transmitting device and the fourth flat plate electrode of the power receiving device is widened, and the stray capacitance generated between the electrodes can be reduced. Thereby, unnecessary coupling between the electrodes can be suppressed, and the power transmission efficiency can be improved.
　前記送電装置は、前記送電装置の基準電位に接続された第１のシールド電極を備え、前記受電装置は、前記受電装置の基準電位に接続された第２のシールド電極を備え、前記第１のシールド電極および前記第２のシールド電極は、間に前記第１の平板電極、前記第２の平板電極、前記第３の平板電極および前記第４の平板電極を介在させて対向している構成が好ましい。 The power transmission device includes a first shield electrode connected to a reference potential of the power transmission device, the power reception device includes a second shield electrode connected to a reference potential of the power reception device, and the first The shield electrode and the second shield electrode are opposed to each other with the first plate electrode, the second plate electrode, the third plate electrode, and the fourth plate electrode interposed therebetween. preferable.
　この構成では、第１のシールド電極および第２のシールド電極により、第１の平板電極および第３の平板電極間の電界結合により発生するノイズの輻射を抑制することができる。また、第３の平板電極が第１の平板電極より大きいため、第１の平板電極と第２のシールド電極との間に生じる浮遊容量が抑制でき、不要な結合を回避できる。 In this configuration, the first shield electrode and the second shield electrode can suppress noise radiation generated by electric field coupling between the first plate electrode and the third plate electrode. Further, since the third plate electrode is larger than the first plate electrode, stray capacitance generated between the first plate electrode and the second shield electrode can be suppressed, and unnecessary coupling can be avoided.
　前記第１のシールド電極と前記第３の平板電極との間の距離は、前記第１の平板電極と前記第２のシールド電極の間の距離より大きいことが好ましい。 It is preferable that a distance between the first shield electrode and the third plate electrode is larger than a distance between the first plate electrode and the second shield electrode.
　この構成では、第１のシールド電極と第３の平板電極との間に生じる浮遊容量を抑えることができる。 In this configuration, stray capacitance generated between the first shield electrode and the third flat plate electrode can be suppressed.
　前記第１のシールド電極は前記第２の電極と電気的に接続され、前記第２のシールド電極は前記第４の電極と電気的に接続されている構成でもよい。 The first shield electrode may be electrically connected to the second electrode, and the second shield electrode may be electrically connected to the fourth electrode.
　この構成では、シールド電極と平板電極とを一の部材により形成することができる。また、第１の平板電極および第３の平板電極をそれぞれ平板電極とシールド電極とにより囲うことができ、ノイズ輻射を抑制できる。 In this configuration, the shield electrode and the flat plate electrode can be formed from one member. Further, the first plate electrode and the third plate electrode can be surrounded by the plate electrode and the shield electrode, respectively, and noise radiation can be suppressed.
　本発明によれば、電極間に形成される浮遊容量を防ぐ減らすことができ、電極間の不要な結合を防止することで、送電装置から受電装置への電力伝送の効率を高めることができる。 According to the present invention, stray capacitance formed between the electrodes can be prevented and reduced, and unnecessary coupling between the electrodes can be prevented, so that the efficiency of power transmission from the power transmitting apparatus to the power receiving apparatus can be increased.
本実施形態に係るワイヤレス電力伝送システムの回路図Circuit diagram of wireless power transmission system according to this embodiment 送電装置に受電装置を載置した状態における断面図Sectional view in a state where the power receiving device is mounted on the power transmitting device 図２に示すアクティブ電極およびパッシブ電極のみを表した図Figure showing only the active and passive electrodes shown in FIG. 送電装置のアクティブ電極と受電装置のパッシブ電極との間に浮遊容量が生じた場合の回路の一部を示す図The figure which shows a part of circuit when stray capacitance arises between the active electrode of a power transmission apparatus, and the passive electrode of a power receiving apparatus 送電装置に受電装置を載置した状態における断面図Sectional view in a state where the power receiving device is mounted on the power transmitting device 送電装置および受電装置それぞれのアクティブ電極およびパッシブ電極の平面視図Plan view of active electrode and passive electrode of power transmission device and power reception device, respectively 図５に示すアクティブ電極、パッシブ電極およびシールド電極のみを表した図The figure showing only the active electrode, passive electrode and shield electrode shown in FIG. 実施形態２の変形例に係る送電装置および受電装置の断面図Sectional drawing of the power transmission apparatus and power receiving apparatus which concern on the modification of Embodiment 2.
（実施形態１）
　図１は、本実施形態に係るワイヤレス電力伝送システムの回路図である。ワイヤレス電力伝送システム３０１は送電装置１０１と受電装置２０１とを備えている。受電装置２０１は負荷ＲＬを備えている。この負荷ＲＬは二次電池と充電回路等を含めたバッテリモジュールである。そして、受電装置２０１は、そのバッテリモジュールを備えた、例えば携帯電子機器である。携帯電子機器としては携帯電話機、ＰＤＡ、携帯音楽プレーヤ、ノート型ＰＣ、デジタルカメラなどが挙げられる。受電装置２０１は送電装置１０１に載置され、送電装置１０１は受電装置２０１の二次電池を充電する。 (Embodiment 1)
FIG. 1 is a circuit diagram of a wireless power transmission system according to the present embodiment. The wireless power transmission system 301 includes a power transmission device 101 and a power reception device 201. The power receiving apparatus 201 includes a load RL. The load RL is a battery module including a secondary battery and a charging circuit. And the power receiving apparatus 201 is a portable electronic device provided with the battery module, for example. Examples of portable electronic devices include mobile phones, PDAs, portable music players, notebook PCs, digital cameras, and the like. The power receiving device 201 is placed on the power transmitting device 101, and the power transmitting device 101 charges the secondary battery of the power receiving device 201.
　送電装置１０１は、高周波発振器ＯＳＣ、昇圧トランスＴＧおよびインダクタＬＧを備えている。高周波電圧発生回路ＯＳＣは例えば１００ｋＨｚ～数１０ＭＨｚの高周波電圧を発生する。昇圧トランスＴＧおよびインダクタＬＧによる昇圧回路は、高周波電圧発生回路ＯＳＣの発生する電圧を昇圧してアクティブ電極１１とパッシブ電極１２との間に印加する。図中の破線で示すキャパシタは、アクティブ電極１１およびパッシブ電極１２の間に形成される浮遊容量、または実部品である。なお、アクティブ電極１１は本発明に係る第１の平板電極、パッシブ電極１２は本発明に係る第２の平板電極に相当する。 The power transmission device 101 includes a high-frequency oscillator OSC, a step-up transformer TG, and an inductor LG. The high frequency voltage generation circuit OSC generates a high frequency voltage of, for example, 100 kHz to several tens of MHz. The step-up circuit using the step-up transformer TG and the inductor LG steps up the voltage generated by the high-frequency voltage generation circuit OSC and applies it between the active electrode 11 and the passive electrode 12. A capacitor indicated by a broken line in the drawing is a stray capacitance formed between the active electrode 11 and the passive electrode 12 or an actual component. The active electrode 11 corresponds to the first plate electrode according to the present invention, and the passive electrode 12 corresponds to the second plate electrode according to the present invention.
　受電装置２０１は、アクティブ電極２１およびパッシブ電極２２に接続された、インダクタＬＬおよび降圧トランスＴＬによる降圧回路と、降圧した交流電圧を直流電圧に変換する整流回路２７と、負荷ＲＬに対して規定の直流電圧を出力するＤＣ－ＤＣコンバータ２８と、負荷ＲＬとを備えている。図中の破線で示すキャパシタは、アクティブ電極２１およびパッシブ電極２２の間に形成される浮遊容量、または実部品である。なお、アクティブ電極２１は本発明に係る第３の平板電極、パッシブ電極２２は本発明に係る第４の平板電極に相当する。 The power receiving device 201 is connected to the active electrode 21 and the passive electrode 22 and includes a step-down circuit using an inductor LL and a step-down transformer TL, a rectifier circuit 27 that converts the stepped-down AC voltage into a DC voltage, and a load RL. A DC-DC converter 28 that outputs a DC voltage and a load RL are provided. A capacitor indicated by a broken line in the drawing is a stray capacitance formed between the active electrode 21 and the passive electrode 22 or an actual component. The active electrode 21 corresponds to the third plate electrode according to the present invention, and the passive electrode 22 corresponds to the fourth plate electrode according to the present invention.
　このワイヤレス電力伝送システム３０１において、受電装置２０１が送電装置１０１に載置され、送電装置１０１のアクティブ電極１１およびパッシブ電極１２間に電圧が印加されることで、対向配置となったアクティブ電極１１，２１同士、および、パッシブ電極１２，２２同士がそれぞれ容量結合して電界が生じる。そして、この電界を介して電力が送電装置１０１から受電装置２０１へ伝送される。受電装置２０１では、電力伝送により誘起される交流電圧が降圧された後、整流および平滑され、負荷ＲＬに印加される。 In this wireless power transmission system 301, the power receiving device 201 is placed on the power transmitting device 101, and a voltage is applied between the active electrode 11 and the passive electrode 12 of the power transmitting device 101, so that the active electrodes 11, 21 and the passive electrodes 12 and 22 are capacitively coupled to generate an electric field. Then, power is transmitted from the power transmitting apparatus 101 to the power receiving apparatus 201 via this electric field. In the power receiving device 201, the AC voltage induced by power transmission is stepped down, then rectified and smoothed, and applied to the load RL.
　以下の説明では、高周波発振器ＯＳＣ、昇圧トランスＴＧおよびインダクタＬＧなどを纏めて送電側回路１０とし、インダクタＬＬ、降圧トランスＴＬ、整流回路２７および負荷ＲＬを纏めて受電側回路２０とする。 In the following description, the high-frequency oscillator OSC, the step-up transformer TG, the inductor LG, and the like are collectively referred to as the power transmission side circuit 10, and the inductor LL, the step-down transformer TL, the rectifier circuit 27, and the load RL are collectively referred to as the power reception side circuit 20.
　図２は、送電装置１０１に受電装置２０１を載置した状態における断面図である。また、図２では、受電装置２０１を送電装置１０１に載置した状態での、アクティブ電極１１，２１およびパッシブ電極２２の平面視図も示している。 FIG. 2 is a cross-sectional view of the power transmission apparatus 101 with the power reception apparatus 201 mounted thereon. FIG. 2 also shows a plan view of the active electrodes 11 and 21 and the passive electrode 22 in a state where the power receiving device 201 is placed on the power transmitting device 101.
　送電装置１０１は樹脂筐体を有し、受電装置２０１が載置される送電装置１０１の載置面となる樹脂層１５内には略矩形状のアクティブ電極１１が設けられている。アクティブ電極11は載置面の裏側（内部側）に貼り付けられていてもよい。また、載置面と反対側の送電装置１０１の底面には、略矩形状のパッシブ電極１２が設けられており、アクティブ電極１１と対向している。パッシブ電極１２は、アクティブ電極１１よりも面積が大きく、平面視した際に、パッシブ電極１２がアクティブ電極１１を包含する形状を成している。アクティブ電極１１は送電装置１０１の載置面、パッシブ電極１２は送電装置１０１の底面に沿って設けられているため、アクティブ電極１１とパッシブ電極１２とは、略送電装置１０１の厚さ分だけ離れている。これらアクティブ電極１１およびパッシブ電極１２には、図１で説明した送電側回路１０が電気的に接続されている。 The power transmission device 101 has a resin casing, and a substantially rectangular active electrode 11 is provided in the resin layer 15 serving as a placement surface of the power transmission device 101 on which the power reception device 201 is placed. The active electrode 11 may be attached to the back side (inside side) of the mounting surface. Further, a substantially rectangular passive electrode 12 is provided on the bottom surface of the power transmission device 101 on the side opposite to the mounting surface, and faces the active electrode 11. The passive electrode 12 has a larger area than the active electrode 11, and the passive electrode 12 includes the active electrode 11 when viewed in plan. Since the active electrode 11 is provided along the mounting surface of the power transmission device 101 and the passive electrode 12 is provided along the bottom surface of the power transmission device 101, the active electrode 11 and the passive electrode 12 are separated by the thickness of the power transmission device 101. ing. The active electrode 11 and the passive electrode 12 are electrically connected to the power transmission side circuit 10 described in FIG.
　受電装置２０１は樹脂筐体を有し、載置した際に送電装置１０１の載置面と接触する受電装置２０１の面（以下、背面という。）となる樹脂層２５内には略矩形状のアクティブ電極２１が設けられている。アクティブ電極２１は、対向するアクティブ電極１１よりも面積が大きく、平面視した際にアクティブ電極２１がアクティブ電極１１を包含する形状を成している。接触面と反対側の受電装置２０１の面（以下、正面という。）には、略矩形状のパッシブ電極２２が設けられ、アクティブ電極２１と対向している。パッシブ電極２２は、パッシブ電極１２の面積と略同じである。また、パッシブ電極２２は、アクティブ電極２１よりも面積が大きく、平面視した際にパッシブ電極２２がアクティブ電極２１を包含する形状を成している。アクティブ電極２１およびパッシブ電極２２には、図１で説明した受電側回路２０が電気的に接続されている。 The power receiving device 201 has a resin casing, and when mounted, the power receiving device 201 has a substantially rectangular shape in the resin layer 25 that is a surface (hereinafter referred to as a back surface) of the power receiving device 201 that comes into contact with the mounting surface of the power transmitting device 101. An active electrode 21 is provided. The active electrode 21 has a larger area than the opposing active electrode 11, and the active electrode 21 includes the active electrode 11 when viewed in plan. A substantially rectangular passive electrode 22 is provided on the surface of the power receiving device 201 opposite to the contact surface (hereinafter referred to as the front surface) and faces the active electrode 21. The passive electrode 22 has substantially the same area as the passive electrode 12. The passive electrode 22 has a larger area than the active electrode 21, and the passive electrode 22 has a shape including the active electrode 21 when viewed in plan. The active electrode 21 and the passive electrode 22 are electrically connected to the power receiving side circuit 20 described in FIG.
　以下に、アクティブ電極１１，２１およびパッシブ電極１２，２２間に形成される浮遊容量について説明する。図３は、図２に示すアクティブ電極１１，２１およびパッシブ電極１２，２２のみを表した図である。図中のＣｓ１は、アクティブ電極１１およびパッシブ電極２２の間に生じる浮遊容量、Ｃｓ２は、アクティブ電極２１およびパッシブ電極１２の間に生じる浮遊容量である。 Hereinafter, the stray capacitance formed between the active electrodes 11 and 21 and the passive electrodes 12 and 22 will be described. FIG. 3 shows only the active electrodes 11 and 21 and the passive electrodes 12 and 22 shown in FIG. In the figure, Cs1 is a stray capacitance generated between the active electrode 11 and the passive electrode 22, and Cs2 is a stray capacitance generated between the active electrode 21 and the passive electrode 12.
　受電装置２０１のアクティブ電極２１と送電装置１０１のパッシブ電極１２との間隔をＴ１、送電装置１０１のアクティブ電極１１と受電装置２０１のパッシブ電極２２との間隔をＴ２で表す。この場合、アクティブ電極１１，２１およびパッシブ電極１２，２２は、Ｔ２＜Ｔ１の関係が成り立つように送電装置１０１および受電装置２０１にそれぞれ設けられている。 The interval between the active electrode 21 of the power receiving apparatus 201 and the passive electrode 12 of the power transmitting apparatus 101 is represented by T1, and the interval between the active electrode 11 of the power transmitting apparatus 101 and the passive electrode 22 of the power receiving apparatus 201 is represented by T2. In this case, the active electrodes 11 and 21 and the passive electrodes 12 and 22 are provided in the power transmitting apparatus 101 and the power receiving apparatus 201 so that the relationship of T2 <T1 is established.
　上述のように受電装置２０１は携帯電子機器であり、薄型化が要求されている。一方で、送電装置１０１は、携帯電子機器の充電装置であり、受電装置２０１ほどの薄型化の要求はない。したがって、間隔Ｔ１を広くすることはできるが、間隔Ｔ２は狭くなる。（少なくともＴ１＞Ｔ２となる傾向にある。）間隔Ｔ１を広くすることで浮遊容量Ｃｓ２は小さくできる。具体的には、送電装置１０１のアクティブ電極１１の一辺が５０～８０ｍｍｍ、受電装置２０１のアクティブ電極２１が１００ｍｍ程度であれば（送電装置１０１側のアクティブ電極１１が受電装置２０１側のアクティブ電極２１と比較して、一辺が８０％程度以下であれば）、アクティブ電極１１とアクティブ電極１２との間の距離が１ｍｍ程度のとき、浮遊容量ＣＳ２はほぼ０となる。しかしながら、仮にアクティブ電極２１がアクティブ電極１１と面積が同じ、またはアクティブ電極１１より面積が小さい場合、間隔Ｔ２が狭くなると大きな浮遊容量Ｃｓ１が生じる。なお、Ｔ１，Ｔ２の具体的数値の一例として、Ｔ１は３．２～６．０ｍｍであり、Ｔ２は１．２～２．５ｍｍである。 As described above, the power receiving apparatus 201 is a portable electronic device and is required to be thin. On the other hand, the power transmission device 101 is a charging device for portable electronic devices, and is not required to be as thin as the power reception device 201. Accordingly, the interval T1 can be increased, but the interval T2 is decreased. (At least T1> T2 tends to be satisfied.) By increasing the interval T1, the stray capacitance Cs2 can be reduced. Specifically, if one side of the active electrode 11 of the power transmission apparatus 101 is 50 to 80 mm and the active electrode 21 of the power reception apparatus 201 is about 100 mm (the active electrode 11 on the power transmission apparatus 101 side is the active electrode 21 on the power reception apparatus 201 side). When the distance between the active electrode 11 and the active electrode 12 is about 1 mm, the stray capacitance CS2 is almost zero. However, if the active electrode 21 has the same area as the active electrode 11 or a smaller area than the active electrode 11, a large stray capacitance Cs1 occurs when the interval T2 is narrowed. As an example of specific values of T1 and T2, T1 is 3.2 to 6.0 mm, and T2 is 1.2 to 2.5 mm.
　図４は、送電装置１０１のアクティブ電極１１と受電装置２０１のパッシブ電極２２との間に浮遊容量Ｃｓ１が生じた場合の回路の一部を示す図である。アクティブ電極１１とパッシブ電極２２との間に浮遊容量Ｃｓ１が形成されると、アクティブ電極１１，２１を介して伝送されるべき電力の一部が浮遊容量Ｃｓ１を介してパッシブ電極２２にも伝送される。この浮遊容量Ｃｓ１を介した電力伝送は、送電装置１０１から受電装置２０１への電力伝送に寄与しないばかりか、損失の増大にもつながるので、送電装置１０１から受電装置２０１への電力伝送効率が低下する。 FIG. 4 is a diagram illustrating a part of a circuit in the case where stray capacitance Cs1 is generated between the active electrode 11 of the power transmission device 101 and the passive electrode 22 of the power reception device 201. When the stray capacitance Cs1 is formed between the active electrode 11 and the passive electrode 22, a part of the power to be transmitted via the active electrodes 11 and 21 is also transmitted to the passive electrode 22 via the stray capacitance Cs1. The The power transmission via the stray capacitance Cs1 not only contributes to the power transmission from the power transmission apparatus 101 to the power reception apparatus 201, but also leads to an increase in loss, so that the power transmission efficiency from the power transmission apparatus 101 to the power reception apparatus 201 decreases. To do.
　そこで、本実施形態では、浮遊容量Ｃｓ１の発生を抑制するため、図３に示すように、アクティブ電極２１はアクティブ電極１１より面積を大きくしている。このアクティブ電極２１が障壁となり、アクティブ電極１１とパッシブ電極２２との間に生じる浮遊容量Ｃｓ１は十分に抑制される。これにより、図４に示す浮遊容量Ｃｓ１が十分に小さくなる結果、送電装置１０１から受電装置２０１への電力伝送効率の低下を防止できる。 Therefore, in this embodiment, in order to suppress the generation of the stray capacitance Cs1, the active electrode 21 has a larger area than the active electrode 11, as shown in FIG. The active electrode 21 serves as a barrier, and the stray capacitance Cs1 generated between the active electrode 11 and the passive electrode 22 is sufficiently suppressed. As a result, the stray capacitance Cs1 shown in FIG.
　なお、図２では、アクティブ電極２１の面積をアクティブ電極１１の面積より大きくし、平面視した際に、アクティブ電極２１がアクティブ電極１１を包含する形状とすることで浮遊容量Ｃｓ１を低減した例を示した。しかしながら、これに限るものではなく、アクティブ電極２１の面積がアクティブ電極１１の面積より大きく、平面視した際に少なくともアクティブ電極２１がアクティブ電極１１とパッシブ電極２２との間に生じる寄生容量Ｃｓ１を十分に抑制する効果を奏すればよいため、アクティブ電極２１がアクティブ電極１１を完全に包含している必要はない。 In FIG. 2, the area of the active electrode 21 is made larger than the area of the active electrode 11, and the stray capacitance Cs1 is reduced by making the active electrode 21 include the active electrode 11 when viewed in plan. Indicated. However, the present invention is not limited to this, and the area of the active electrode 21 is larger than the area of the active electrode 11, and at least the active electrode 21 has a sufficient parasitic capacitance Cs1 generated between the active electrode 11 and the passive electrode 22 when viewed in plan. Therefore, the active electrode 21 does not need to completely include the active electrode 11.
（実施形態２）
　以下に、実施形態２に係るワイヤレス電力伝送システムについて説明する。実施形態２に係るワイヤレス電力伝送システムの回路構成は、図１で説明した実施形態１と同様であるため、説明は省略する。 (Embodiment 2)
The wireless power transmission system according to the second embodiment will be described below. The circuit configuration of the wireless power transmission system according to the second embodiment is the same as that of the first embodiment described with reference to FIG.
　図５は、送電装置１０１に受電装置２０１を載置した状態における断面図である。図６は、送電装置１０１および受電装置２０１それぞれのアクティブ電極１１，２１およびパッシブ電極１２，２２の平面視図である。 FIG. 5 is a cross-sectional view of the power transmitting apparatus 101 with the power receiving apparatus 201 mounted thereon. FIG. 6 is a plan view of the active electrodes 11 and 21 and the passive electrodes 12 and 22 of the power transmitting apparatus 101 and the power receiving apparatus 201, respectively.
　送電装置１０１の樹脂層１５内には、矩形状のアクティブ電極１１およびパッシブ電極１２が同一平面上に設けられている。パッシブ電極１２の外形はアクティブ電極１１よりも大きく、パッシブ電極１２の中央部には、矩形状の切欠き部１２Ａが形成されている。アクティブ電極１１は切欠き部１２Ａ内に位置している。また、送電装置１０１の底面には、送電装置１０１の基準電位に接続されたシールド電極１３が設けられている。シールド電極１３は、パッシブ電極１２と略同じ大きさを有し、アクティブ電極１１およびパッシブ電極１２と対向している。シールド電極１３は、アクティブ電極１１などの結合部から生じるノイズ輻射を遮蔽している。 In the resin layer 15 of the power transmission apparatus 101, a rectangular active electrode 11 and a passive electrode 12 are provided on the same plane. The external shape of the passive electrode 12 is larger than that of the active electrode 11, and a rectangular notch 12 </ b> A is formed at the center of the passive electrode 12. The active electrode 11 is located in the notch 12A. Further, a shield electrode 13 connected to the reference potential of the power transmission device 101 is provided on the bottom surface of the power transmission device 101. The shield electrode 13 has substantially the same size as the passive electrode 12 and faces the active electrode 11 and the passive electrode 12. The shield electrode 13 shields noise radiation generated from the coupling portion such as the active electrode 11.
　受電装置２０１の樹脂層２５内には、略矩形状のアクティブ電極２１およびパッシブ電極２２が同一平面上に設けられている。パッシブ電極２２は、パッシブ電極１２と略同じ大きさを有し、パッシブ電極２２の中央部には、矩形状の切欠き部２２Ａが形成されている。アクティブ電極２１は、この切欠き部２２Ａ内に位置している。アクティブ電極２１は、対向するアクティブ電極１１よりも大きい面積を有している。 In the resin layer 25 of the power receiving device 201, a substantially rectangular active electrode 21 and passive electrode 22 are provided on the same plane. The passive electrode 22 has substantially the same size as the passive electrode 12, and a rectangular notch 22 </ b> A is formed at the center of the passive electrode 22. The active electrode 21 is located in the notch 22A. The active electrode 21 has a larger area than the opposing active electrode 11.
　ここで、アクティブ電極１１とパッシブ電極１２との間隔をＴ３で表し、アクティブ電極２１とパッシブ電極２２との間隔をＴ４で表す。この場合、アクティブ電極１１，２１およびパッシブ電極１２，２２は、Ｔ４＜Ｔ３の関係が成り立つようにそれぞれ形成されている。 Here, the interval between the active electrode 11 and the passive electrode 12 is represented by T3, and the interval between the active electrode 21 and the passive electrode 22 is represented by T4. In this case, the active electrodes 11 and 21 and the passive electrodes 12 and 22 are formed so that the relationship of T4 <T3 is established.
　また、受電装置２０１の正面には、受電装置２０１のグランド電位（基準電位）に接続されたシールド電極２３が設けられている。シールド電極２３は、パッシブ電極２２と略同じ大きさを有し、アクティブ電極２１およびパッシブ電極２２と対向している。シールド電極２３は、アクティブ電極２１などの結合部から生じるノイズ輻射を遮蔽している。 Further, a shield electrode 23 connected to the ground potential (reference potential) of the power receiving device 201 is provided on the front surface of the power receiving device 201. The shield electrode 23 has substantially the same size as the passive electrode 22 and faces the active electrode 21 and the passive electrode 22. The shield electrode 23 shields noise radiation generated from the coupling portion such as the active electrode 21.
　以下に、アクティブ電極１１，２１およびパッシブ電極１２，２２間に形成される浮遊容量について説明する。図７は、図５に示すアクティブ電極１１，２１、パッシブ電極１２，２２およびシールド電極１３，２３のみを表した図である。図中のＣｓ３は、アクティブ電極１１およびシールド電極２３の間に生じる浮遊容量、Ｃｓ４は、アクティブ電極２１およびシールド電極１３の間に生じる浮遊容量である。 Hereinafter, the stray capacitance formed between the active electrodes 11 and 21 and the passive electrodes 12 and 22 will be described. FIG. 7 shows only the active electrodes 11 and 21, the passive electrodes 12 and 22, and the shield electrodes 13 and 23 shown in FIG. 5. In the figure, Cs3 is a stray capacitance generated between the active electrode 11 and the shield electrode 23, and Cs4 is a stray capacitance generated between the active electrode 21 and the shield electrode 13.
　実施形態１と同様に、薄型化の要求が少ない送電装置１０１では、装置を厚くすることができるため、受電装置２０１のアクティブ電極２１と送電装置１０１のシールド電極１３との間隔を広くすることができ、その結果、浮遊容量Ｃｓ４を小さくできる。一方で、仮にアクティブ電極２１がアクティブ電極１１の面積と同じ、またはアクティブ電極１１より面積が小さい場合、受電装置２０１の厚みを薄くする必要があることから、送電装置１０１のアクティブ電極１１と受電装置２０１のシールド電極２３との間隔が狭くなり、大きな浮遊容量Ｃｓ３が生じる。大きな浮遊容量Ｃｓ３が生じると、パッシブ電極２２とシールド電極２３とは基準電位に接続されているため、アクティブ電極１１とパッシブ電極２２とは、シールド電極２３を介して容量結合する。 As in the first embodiment, in the power transmission device 101 that is less demanded to be thin, the device can be thickened. Therefore, the interval between the active electrode 21 of the power reception device 201 and the shield electrode 13 of the power transmission device 101 can be widened. As a result, the stray capacitance Cs4 can be reduced. On the other hand, if the active electrode 21 has the same area as the active electrode 11 or a smaller area than the active electrode 11, it is necessary to reduce the thickness of the power receiving device 201. The distance between the shield electrode 23 and the shield electrode 23 is reduced, and a large stray capacitance Cs3 is generated. When the large stray capacitance Cs3 occurs, the active electrode 11 and the passive electrode 22 are capacitively coupled via the shield electrode 23 because the passive electrode 22 and the shield electrode 23 are connected to the reference potential.
　そこで、本実施形態では、上述のように、アクティブ電極２１はアクティブ電極１１より大きく、かつ、Ｔ４＜Ｔ３の関係とすることで、アクティブ電極２１が障壁となり、アクティブ電極１１とシールド電極２３との間に生じる浮遊容量Ｃｓ３を十分に抑制できる。浮遊容量Ｃｓ３を抑制した結果、図４で説明したように、送電装置１０１から受電装置２０１への電力伝送効率の低下を防止できる。 Therefore, in the present embodiment, as described above, the active electrode 21 is larger than the active electrode 11 and has a relationship of T4 <T3, so that the active electrode 21 becomes a barrier, and the active electrode 11 and the shield electrode 23 The stray capacitance Cs3 generated therebetween can be sufficiently suppressed. As a result of suppressing the stray capacitance Cs3, it is possible to prevent a reduction in power transmission efficiency from the power transmission apparatus 101 to the power reception apparatus 201 as described in FIG.
　また、アクティブ電極１１とシールド電極２３との間に浮遊容量Ｃｓ３が形成されると、シールド電極２３は受電装置２０１の基準電位に接続されているため、シールド電極２３を介して受電装置２０１の基準電位にノイズが重畳する場合がある。この場合、受電装置２０１の機能の誤作動を引き起こすといった問題が生じる。しかし、本実施形態では、浮遊容量Ｃｓ３が抑制されるので、誤作動などの問題も回避できる。 In addition, when the stray capacitance Cs3 is formed between the active electrode 11 and the shield electrode 23, the shield electrode 23 is connected to the reference potential of the power receiving device 201, and thus the reference of the power receiving device 201 via the shield electrode 23. Noise may be superimposed on the potential. In this case, a problem of causing a malfunction of the function of the power receiving apparatus 201 occurs. However, in this embodiment, since the stray capacitance Cs3 is suppressed, problems such as malfunctions can be avoided.
　上記の例において、アクティブ電極１１とパッシブ電極１２は同一平面上に形成されており、またアクティブ電極２１とパッシブ電極２２は同一平面状に形成されている例を示したが、これらは必ずしも完全に同一な面上になく、これらの電極を平面視する方向から見て互いに前後するように配置されていても、先に述べた面積の関係を有していれば、同様の効果を得ることができる。 In the above example, the active electrode 11 and the passive electrode 12 are formed on the same plane, and the active electrode 21 and the passive electrode 22 are formed on the same plane. Even if these electrodes are not on the same plane and are arranged so as to be back and forth with each other when viewed in a plan view, the same effect can be obtained as long as they have the aforementioned area relationship. it can.
　なお、アクティブ電極１１とパッシブ電極２２との間にも浮遊容量（不図示）は生じるが、アクティブ電極１１とパッシブ電極２２とは面が対向しておらず、電極の側面同士が対向し、かつ、間隔も広いため、浮遊容量は小さく、略無視できる。 Although stray capacitance (not shown) is also generated between the active electrode 11 and the passive electrode 22, the surfaces of the active electrode 11 and the passive electrode 22 are not opposed to each other, and the side surfaces of the electrodes are opposed to each other. Since the interval is wide, the stray capacitance is small and can be almost ignored.
　以下に、実施形態２の変形例について説明する。 Hereinafter, a modification of the second embodiment will be described.
　図８は、実施形態２の変形例に係る送電装置１０１および受電装置２０１の断面図である。図８に示すように、送電装置１０１において、パッシブ電極１２とシールド電極１３とを接続電極１４で接続する構成であってもよい。また、受電装置２０１において、アクティブ電極２１とシールド電極２３とを接続電極２４で接続する構成であってもよい。この場合、パッシブ電極１２、シールド電極１３および接続電極１４は一の部材で形成されてもよいし、パッシブ電極１２、シールド電極１３および接続電極１４はそれぞれ別個の部材であってもよい。また、パッシブ電極２２、シールド電極２３および接続電極２４は一の部材で形成されてもよいし、アクティブ電極２１、シールド電極２３および接続電極２４はそれぞれ別個の部材であってもよい。 FIG. 8 is a cross-sectional view of a power transmission device 101 and a power reception device 201 according to a modification of the second embodiment. As shown in FIG. 8, the power transmission device 101 may have a configuration in which the passive electrode 12 and the shield electrode 13 are connected by the connection electrode 14. In the power receiving device 201, the active electrode 21 and the shield electrode 23 may be connected by the connection electrode 24. In this case, the passive electrode 12, the shield electrode 13, and the connection electrode 14 may be formed of a single member, or the passive electrode 12, the shield electrode 13, and the connection electrode 14 may be separate members. Moreover, the passive electrode 22, the shield electrode 23, and the connection electrode 24 may be formed by one member, and the active electrode 21, the shield electrode 23, and the connection electrode 24 may be separate members.
　さらに、送電装置１０１および受電装置２０１の筐体を金属筐体とした場合に、シールド電極１３，２３は、その金属筐体を利用したものであってもよい。また、アクティブ電極１１，２１およびパッシブ電極１２，２２は、例えば円形状であってもよい。 Furthermore, when the casings of the power transmitting apparatus 101 and the power receiving apparatus 201 are metal casings, the shield electrodes 13 and 23 may use the metal casings. The active electrodes 11 and 21 and the passive electrodes 12 and 22 may be circular, for example.
１１－アクティブ電極（第１の平板電極）
１２－パッシブ電極（第２の平板電極）
１３－シールド電極（第１のシールド電極）
２１－アクティブ電極（第３の平板電極）
２２－パッシブ電極（第４の平板電極）
２３－シールド電極（第２のシールド電極）
１０１－送電装置
１０２－受電装置
３０１－ワイヤレス電力伝送システム
Ｃｓ１，Ｃｓ２，Ｃｓ３，Ｃｓ４－浮遊容量 11-active electrode (first plate electrode)
12-passive electrode (second plate electrode)
13-Shield electrode (first shield electrode)
21-active electrode (third plate electrode)
22-Passive electrode (fourth plate electrode)
23-Shield electrode (second shield electrode)
101-Power transmission device 102-Power reception device 301-Wireless power transmission system Cs1, Cs2, Cs3, Cs4-Floating capacitance

Claims (6)

  1. 　送電装置に受電装置を載置した状態で、前記送電装置から前記受電装置へ、容量結合方式による電力伝送を行うワイヤレス電力伝送システムにおいて、
    　前記送電装置は、
    　第１の平板電極と、
    　第２の平板電極と、
    　前記第１の平板電極および前記第２の平板電極に交流電圧を印加する送電側回路と、
    　を備え、
    　前記受電装置は、
    　前記第１の平板電極に間隙をおいて対向する第３の平板電極と、
    　前記受電装置の基準電位に接続され、前記第２の平板電極に間隙をおいて対向する第４の平板電極と、
    　前記第３の電極および前記第４の電極に接続された受電側回路と、
    　を備え、
    　前記第３の平板電極は、前記第１の平板電極よりも面積が大きく、
    　前記第２の平板電極と前記第４の平板電極とは、間に前記第１の平板電極および前記第３の平板電極を介在させて対向している、
    　ワイヤレス電力伝送システム。     In a wireless power transmission system that performs power transmission by a capacitive coupling method from the power transmission device to the power reception device in a state where the power reception device is mounted on the power transmission device,
    The power transmission device is:
    A first plate electrode;
    A second plate electrode;
    A power transmission side circuit for applying an AC voltage to the first plate electrode and the second plate electrode;
    With
    The power receiving device is:
    A third plate electrode facing the first plate electrode with a gap;
    A fourth plate electrode connected to a reference potential of the power receiving device and facing the second plate electrode with a gap;
    A power receiving side circuit connected to the third electrode and the fourth electrode;
    With
    The third plate electrode has a larger area than the first plate electrode,
    The second plate electrode and the fourth plate electrode are opposed to each other with the first plate electrode and the third plate electrode interposed therebetween,
    Wireless power transmission system.
  2. 　前記第２の平板電極と前記第３の平板電極との間の距離は、前記第１の平板電極と前記第４の平板電極との間の距離より大きい、
    　請求項１のワイヤレス電力伝送システム。     A distance between the second plate electrode and the third plate electrode is greater than a distance between the first plate electrode and the fourth plate electrode;
    The wireless power transmission system of claim 1.
  3. 　送電装置に受電装置を載置した状態で、前記送電装置から前記受電装置へ、容量結合方式による電力伝送を行うワイヤレス電力伝送システムにおいて、
    　前記送電装置は、
    　第１の平板電極と、
    　前記第１の平板電極と略同一平面上に設けられた第２の平板電極と、
    　前記第１の平板電極および前記第２の平板電極に交流電圧を印加する送電側回路と、
    　を備え、
    　前記受電装置は、
    　前記第１の平板電極に間隙をおいて対向する第３の平板電極と、
    　前記第２の平板電極に間隙をおいて対向し、かつ、前記第３の平板電極と略同一平面上に設けられた第４の平板電極と、
    　前記第３の電極および前記第４の電極に接続された受電側回路と、
    　を備え、
    　前記第３の平板電極は、前記第１の平板電極よりも面積が大きく、
    　前記第１の平板電極と前記第２の平板電極との間隔は、前記第３の平板電極と前記第４の平板電極との間隔より広い、
    　ワイヤレス電力伝送システム。     In a wireless power transmission system that performs power transmission by a capacitive coupling method from the power transmission device to the power reception device in a state where the power reception device is mounted on the power transmission device,
    The power transmission device is:
    A first plate electrode;
    A second plate electrode provided on substantially the same plane as the first plate electrode;
    A power transmission side circuit for applying an AC voltage to the first plate electrode and the second plate electrode;
    With
    The power receiving device is:
    A third plate electrode facing the first plate electrode with a gap;
    A fourth flat plate electrode opposed to the second flat plate electrode with a gap and provided on substantially the same plane as the third flat plate electrode;
    A power receiving side circuit connected to the third electrode and the fourth electrode;
    With
    The third plate electrode has a larger area than the first plate electrode,
    An interval between the first plate electrode and the second plate electrode is wider than an interval between the third plate electrode and the fourth plate electrode.
    Wireless power transmission system.
  4. 　前記送電装置は、前記送電装置の基準電位に接続された第１のシールド電極を備え、
    　前記受電装置は、前記受電装置の基準電位に接続された第２のシールド電極を備え、
    　前記第１のシールド電極および前記第２のシールド電極は、間に前記第１の平板電極、前記第２の平板電極、前記第３の平板電極および前記第４の平板電極を介在させて対向している、
    　請求項３に記載のワイヤレス電力伝送システム。     The power transmission device includes a first shield electrode connected to a reference potential of the power transmission device,
    The power receiving device includes a second shield electrode connected to a reference potential of the power receiving device,
    The first shield electrode and the second shield electrode are opposed to each other with the first plate electrode, the second plate electrode, the third plate electrode, and the fourth plate electrode interposed therebetween. ing,
    The wireless power transmission system according to claim 3.
  5. 　前記第１のシールド電極と前記第３の平板電極との間の距離は、前記第１の平板電極と前記第２のシールド電極の間の距離より大きい、
    　請求項３または４のワイヤレス電力伝送システム。     A distance between the first shield electrode and the third plate electrode is larger than a distance between the first plate electrode and the second shield electrode;
    The wireless power transmission system according to claim 3 or 4.
  6. 　前記第１のシールド電極は前記第２の電極と電気的に接続され、
    　前記第２のシールド電極は前記第４の電極と電気的に接続されている、
    　請求項４または５に記載のワイヤレス電力伝送システム。     The first shield electrode is electrically connected to the second electrode;
    The second shield electrode is electrically connected to the fourth electrode;
    The wireless power transmission system according to claim 4 or 5.
PCT/JP2013/084007 2013-02-15 2013-12-19 Wireless power transfer system WO2014125731A1 (en)

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Cited By (3)

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CN108110871A (en) * 2016-11-22 2018-06-01 中兴新能源汽车有限责任公司 wireless charging secondary device and electric vehicle
NL2027140B1 (en) * 2020-12-17 2022-07-11 Herman Johan Mensink Clemens A method of capacitively transferring energy and a semiconductor component and device for use with the method
CN116137464A (en) * 2023-04-20 2023-05-19 中国人民解放军海军工程大学 Electric field type wireless power transmission five-plate coupler and equivalent method thereof

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JP2012530481A (en) * 2009-06-25 2012-11-29 株式会社村田製作所 Power transmission system and non-contact charging device

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Publication number Priority date Publication date Assignee Title
CN108110871A (en) * 2016-11-22 2018-06-01 中兴新能源汽车有限责任公司 wireless charging secondary device and electric vehicle
NL2027140B1 (en) * 2020-12-17 2022-07-11 Herman Johan Mensink Clemens A method of capacitively transferring energy and a semiconductor component and device for use with the method
CN116137464A (en) * 2023-04-20 2023-05-19 中国人民解放军海军工程大学 Electric field type wireless power transmission five-plate coupler and equivalent method thereof

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