Resonant coupling power transmission system, resonance type power transmission device, and resonance type power reception device

• US 10,158,254 B2
• Filed: 09/02/2014
• Issued: 12/18/2018
• Est. Priority Date: 09/02/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Engineering Co Ltd (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Electric Engineering Co Ltd (Mitsubishi Electric Corporation)
• Inventors: Akuzawa, Yoshiyuki, Sakai, Kiyohide, Ezoe, Toshihiro
• Primary Examiner(s): CAVALLARI-SEE, DANIEL
• Application Number:
  US15/320,215
• Publication Number:
  US 20170155283A1
• Time in Patent Office: 1,568 Days
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

A resonant coupling power transmission system includes a resonance type power transmission device 1 having a resonance type power supply 11 to supply power, and a resonance type transmission antenna 13 to transmit the power supplied by the resonance type power supply 11, and a resonance type power reception device 2 having a resonance type reception antenna 21 to receive the power transmitted by the resonance type transmission antenna 13, and a reception circuit 23 to supply the power received by the resonance type reception antenna 21 to a load, and the characteristic impedance of each of the functional units is set in such a way that there is provided a correlation among the resonance characteristic value of the resonance type power supply 11, that of the resonance type transmission antenna 13, and that of the resonance type power reception device 2.

Claims

1. A resonant coupling power transmission system comprising:

a resonance type power transmission device having a resonance type power supply to supply power, and a resonance type transmission antenna to transmit the power supplied by said resonance type power supply; and

a resonance type power reception device having a resonance type reception antenna to receive the power transmitted by said resonance type transmission antenna, and a reception circuit to supply the power received by said resonance type reception antenna to a load,

wherein when a resonance characteristic value of said resonance type power supply is denoted by Q_o, a resonance characteristic value of said resonance type transmission antenna is denoted by Q_t, and a resonance characteristic value of said resonance type power reception device is denoted by Q_r, characteristic impedances of said resonance type power supply, said resonance type transmission antenna, said resonance type reception antenna, and said reception circuit are set in such a way that 0.5Qr≤

√

(Qo·

Qt)≤

1.5Qr is satisfied.

2. The resonant coupling power transmission system according to claim 1, wherein when a coefficient of coupling between said resonance type transmission antenna and said resonance type reception antenna is denoted by k, wherein 0.5≤

k√

(Qo·

Qt)≤

1.5 is satisfied.

3. The resonant coupling power transmission system according to claim 1, wherein when a coefficient of coupling between said resonance type transmission antenna and said resonance type reception antenna is denoted by k, wherein 0.5≤

kQr≤

1.5 is satisfied.

4. The resonant coupling power transmission system according to claim 1, wherein a resonance frequency of said resonance type transmission antenna differs from that of said resonance type reception antenna.

5. The resonant coupling power transmission system according to claim 1, wherein a resonance frequency of said resonance type power supply is equal to or greater than 2 MHz.

6. The resonant coupling power transmission system according to claim 1, wherein power transmission according to a resonant coupling between said resonance type transmission antenna and said resonance type reception antenna is a one according to either of a magnetic field, an electric field, and electromagnetic induction.

7. A resonance type power transmission device comprising:

a resonance type power supply to supply power; and

a resonance type transmission antenna to transmit the power supplied by said resonance type power supply,

wherein when a resonance characteristic value of said resonance type power supply is denoted by Q_o, a resonance characteristic value of said resonance type transmission antenna is denoted by Q_t, and a resonance characteristic value of a resonance type power reception device having a resonance type reception antenna to receive the power transmitted by said resonance type transmission antenna, and a reception circuit to supply the power received by said resonance type reception antenna to a load is denoted by Q_r, characteristic impedances of said resonance power supply, said resonance type transmission antenna, said resonance type reception antenna, and said reception circuit are set in such a way that 0.5Qr≤

√

(Qo·

Qt)≤

1.5Qr is satisfied.

8. A resonance type power reception device comprising:

a resonance type reception antenna to receive power transmitted by a resonance type power transmission device having a resonance type power supply to supply the power, and a resonance type transmission antenna to transmit the power supplied by said resonance type power supply; and

a reception circuit to supply the power received by said resonance type reception antenna to a load,

wherein when a resonance characteristic value of said resonance type power supply is denoted by Q_o, a resonance characteristic value of said resonance type transmission antenna is denoted by Q_t, and a resonance characteristic value of said resonance type power reception device is denoted by Q_r, characteristic impedances of said resonance type power supply, said resonance type transmission antenna, said resonance type reception antenna, and said reception circuit are set in such a way that 0.5Qr≤

√

(Qo·

Qt)≤

1.5Qr is satisfied.