Title:
WIRELESS POWER-TRANSFER SYSTEM AND POWER-TRANSMISSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/015771
Kind Code:
A1
Abstract:
The power-transmission device in the disclosed wireless power-transfer system is provided with an oscillator circuit, a power-transmission antenna, a memory, a reception circuit, and a control circuit. The oscillator circuit outputs AC power converted from DC power supplied by a DC power supply. The power-transmission antenna transmits the AC power outputted by the oscillator circuit in order to output said AC power to a power-reception-device load. The memory holds a prescribed value that indicates the voltage requested by the power-reception device. The reception circuit receives the voltage being supplied to the power-reception-device load. The control circuit: uses a first switching element and a second switching element to vary the time at which to set a first output terminal of the oscillator circuit and a second output terminal of the oscillator circuit to the same potential, thereby varying the output time ratio of the AC voltage outputted by the oscillator circuit; varies the frequency of the AC voltage outputted by the oscillator circuit and determines the AC frequency that maximizes the efficiency of the AC power; brings the received voltage to within the range indicated by the abovementioned prescribed value; and outputs, to the load, AC power that maximizes the aforementioned efficiency.
Inventors:
YAMAMOTO HIROSHI
SAKATA TSUTOMU
KANNO HIROSHI
MATSUMOTO HIROMU
SAKATA TSUTOMU
KANNO HIROSHI
MATSUMOTO HIROMU
Application Number:
PCT/JP2014/003894
Publication Date:
February 05, 2015
Filing Date:
July 24, 2014
Export Citation:
Assignee:
PANASONIC CORP (JP)
International Classes:
H02J17/00; H02J7/00
Foreign References:
| JP2011509067A | 2011-03-17 | |||
| JP2010213414A | 2010-09-24 | |||
| JP2007336717A | 2007-12-27 | |||
| JP2012130173A | 2012-07-05 | |||
| JP2008109762A | 2008-05-08 | |||
| US20080278264A1 | 2008-11-13 | |||
| JP2010068657A | 2010-03-25 | |||
| JPS62135270A | 1987-06-18 |
Other References:
See also references of EP 3032698A4
Attorney, Agent or Firm:
TOKUDA, Yoshiaki et al. (JP)
Yoshiaki Tokuda (JP)
Yoshiaki Tokuda (JP)
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