Non-contact power supply system

• US 9,711,277 B2
• Filed: 04/17/2012
• Issued: 07/18/2017
• Est. Priority Date: 07/20/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Ogasawara, Kiyoshi, Furukawa, Kaoru, Akiyama, Toshihiro
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Dhillon, Jagdeep
• Application Number:
  US14/232,505
• Publication Number:
  US 20140145517A1
• Time in Patent Office: 1,918 Days
• Field of Search: 307104, 307149, 307109, 307108, 307 64, 307 66, 32420717, 32420716, 32420726, 104148 SS, 455 411, 320108
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A non-contact power supply system includes a power supply device and a power reception device. The power supply device includes primary coils arranged on a power supply surface and configured to be excited at an operational frequency. The power reception device includes a secondary coil configured to induce current using resonance phenomenon based on alternating flux from the primary coils when arranged on the power supply surface. The operational frequency that excites the primary coil is set at or in the proximity of a resonance frequency of a resonance system formed when the secondary coil is located at an intermediate position between two of the primary coils that are adjacent to each other.

Claims

1. A non-contact power supply system comprising:

a power supply device, which includes primary coils arranged on a power supply surface and configured to be excited at an operational frequency;

a power reception device, which includes a secondary coil configured to induce current using resonance phenomenon based on alternating flux from the primary coils when arranged on the power supply surface; and

a capacitor connected to the secondary coil, wherein

capacitance of the capacitor is adjusted such that the operational frequency that excites the primary coil is set in the proximity of a resonance frequency of a resonance system formed when the secondary coil is located at an intermediate position between two of the primary coils that are adjacent to each other,

the proximity of the resonance frequency is a frequency region between two intersecting points of a resonance curve, which represents the resonance system formed when the secondary coil is located at the intermediate position, and a resonance curve, which represents a resonance system formed when the secondary coil is located at a directly opposed position at which the secondary coil is directly opposed to one of the primary coils, and

when the operational frequency is set in the frequency region, an output power of the power reception device at the intermediate position is greater than or equal to an output power of the power reception device at the directly opposed position.

2. The non-contact power supply system according to claim 1, wherein

in the proximity of the resonance frequency at the resonance system of the intermediate position, the operational frequency is set to differ from the resonance frequency.