WIRELESS POWER SUPPLY DEVICE

• US 20150054349A1
• Filed: 02/04/2013
• Published: 02/26/2015
• Est. Priority Date: 02/17/2012
• Status: Abandoned Application

• Current Assignee: KEIO University
• Original Assignee: KEIO University
• Inventors: Ishikuro, Hiroki, Kuroda, Tadahiro, Taguchi, Masao
• Application Number:
  US14/379,244
• Publication Number:
  US 20150054349A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

Wirelessly supplying power is rapidly changed by a switching circuit 11 selectively exciting a magnetic field coupling resonance circuit of L1 and C1 for wireless power supply by use of a resonant frequency of the resonance circuit and its ⅓-divided frequency. A large power is supplied in the case of excitation at the resonant frequency, and in the case of excitation at the ⅓-divided frequency, a small power is supplied. A wireless power supply device with a high power conversion efficiency, with less unwanted radiation, and capable of rapidly changing supplying power can thereby be provided.

Claims

1. A wireless power supply device comprising:

a power transmission-side resonance circuit that resonates at a predetermined resonant frequency and inductively couples with a power reception-side resonance circuit to supply power wirelessly;

a switching circuit that excites the power transmission-side resonance circuit at a predetermined frequency; and

a control circuit that controls supplying power by controlling excitation of the switching circuit selectively at a plurality of frequencies among the resonant frequency and subharmonic frequencies for which the resonant frequency is divided by an odd number.

3. The wireless power supply device according to claim 1, wherein the control circuit selects the plurality of frequencies pseudo-randomly.

4. The wireless power supply device according to claim 3, wherein the control circuit selects the plurality of frequencies pseudo-randomly by Δ

Σ

modulation.

5. The wireless power supply device according to claim 1, wherein the control circuit receives information concerning necessary supplying power from a power reception-side circuit, and selects the plurality of frequencies according to the necessary supplying power.

2. A wireless power supply device comprising:

a power transmission-side resonance circuit that resonates at a predetermined resonant frequency and inductively couples with a power reception-side resonance circuit to supply power wirelessly;

a switching circuit that excites the power transmission-side resonance circuit at a predetermined frequency;

a control circuit that controls supplying power by controlling excitation of the switching circuit selectively at a plurality of frequencies among the resonant frequency and subharmonic frequencies for which the resonant frequency is divided by an odd number; and

a power reception-side resonance circuit that resonates at the resonant frequency and inductively couples with the power transmission-side resonance circuit to be supplied with power wirelessly.