Wireless power transmission system for transmitting alternating-current power wirelessly
地域：
Tokyo
摘要
[OBJECT] There is provided a wireless power transmission system capable of transmitting power efficiently even when it is rotated.[ORGANIZATION] A power transmission device has a first and a second electrode (a center electrode 311 and an annular electrode 312) each having a rotationally symmetrical shape with respect to a common center axis, a first and a second connection line (connection lines 315, 316), and a first inductor to (inductor 313, 314). A power reception device has a third and a fourth electrode (center electrode 321 and annular electrode 322) each having a rotationally symmetrical shape with respect to a common center axis, a third and a fourth connection line (connection lines 325, 326), and a second inductor. The electrodes of the power transmission device and the power reception device are disposed to oppose each other across a distance of λ/2π or less as a near field, and a resonance frequency of a coupler constituted of the first and the second electrode and the first inductor and a resonance frequency of a coupler constituted of the third and the fourth electrode and the second inductor (inductor 323, 324) are set to be substantially equal.
說明書
This application is a continuation application of, and claims priority to, International Application No. PCT/JP2013/081826, filed Nov. 27, 2013 and entitled “WIRELESS POWER TRANSMISSION SYSTEM”, which claims priority to Japanese Patent Application No. 2013-017774, filed Jan. 31, 2013, the disclosures of each of which are incorporated herein by reference in their entireties.
The present invention relates to a wireless power transmission system.
Patent Document 1 discloses a wireless power transmission device which performs transmission of power between two non-contact electric circuits by using electromagnetic induction.
Patent Document 1: Japanese Patent Application Laid-open No. H8-340285
Incidentally, in the technology disclosed in Patent Document 1, power loss in a coil for transmitting power is large, and thus there is a problem that power cannot be transmitted efficiently. Further, in a second embodiment illustrated in
權(quán)利要求
The invention claimed is:1. A wireless power transmission system transmitting alternating-current power from a power transmission device to a power reception device, whereinthe power transmission device comprises: a first and a second electrode which are disposed across a predetermined distance, in which a total width including the predetermined distance is λ/2π or less as a near field, the first and the second electrode each having a rotationally symmetrical shape with respect to a common center axis; a first and a second connection line electrically connecting the first and the second electrode and two output terminals of an alternating-current power generating unit, respectively; and a first inductor residing between the first and the second electrode and at least one of the two output terminals of the alternating current power generating unit, and the power reception device comprises: a third and a fourth electrode which are disposed across a predetermined distance, in which a total width including the predetermined distance is λ/2π or less as a near field, the third and the fourth electrode each having a rotationally symmetrical shape with respect to a common center axis; a third and a fourth connection line electrically connecting the third and the fourth electrode and two input terminals of a load, respectively; and a second inductor residing between the third and the fourth electrode and at least one of the two input terminals of the load, wherein: the electrodes of the power transmission device and the power reception device are disposed to oppose each other across a distance of λ/2π or less as a near field, a resonance frequency of a coupler constituted of the first and the second electrode and the first inductor and a resonance frequency of a coupler constituted of the third and the fourth electrode and the second inductor are set to be substantially equal, the first electrode has a first platy polygonal or circular shape, and the second electrode has a second platy polygonal or circular annular shape disposed to surround the first electrode and is disposed on a same plane to have a first center axis corresponding to that of the first electrode, the third electrode has a third platy polygonal or circular shape, and the fourth electrode has a fourth platy polygonal or circular annular shape disposed to surround the third electrode and is disposed on a same plane to have a second center axis corresponding to that of the third electrode, and the first and the second electrode and the third and the fourth electrode are disposed to oppose each other across a distance of λ/2π or less as a near field. 2. The wireless power transmission system according to claim 1 , wherein at least one of the first to the fourth electrode has a cutout in a radial direction. 3. The wireless power transmission system according to claim 1 , wherein at least one of the first electrode and the third electrode has an annular shape. 4. The wireless power transmission system according to claim 1 , wherein at least one of the first to the fourth electrode has a three-dimensional structure extending in an axial direction.
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