Title:
POWER TRANSMISSION DEVICE, POWER TRANSMISSION SYSTEM, AND CONTROL METHOD OF POWER TRANSMISSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/146786
Kind Code:
A1
Abstract:
The present invention provides a power transmission device having a simple configuration. The power transmission device includes: a primary resonance coil which transmits power through magnetic field resonance or electric field resonance; a high frequency power source which outputs high frequency transmission power to the primary resonance coil; a power control unit which controls the transmission power that is output to the primary resonance coil from the high frequency power source; and a charge state determination unit which determines, on the basis of an impedance viewed from a high frequency power source-side of the primary resonance coil, whether a power receiver is being charged, wherein a first loop process, which is performed after the transmission of power is started at a prescribed transmission power by the power control unit, includes: a first transmission power control process in which the power control unit reduces the transmission power, which is output by the high frequency power source, by prescribed power; and a first determination process in which the charge state determination unit determines whether the power receiver is being charged in a state where the power transmission is performed at the transmission power that is reduced by the prescribed power. When the power receiver is determined as being charged in the first determination process, the first loop process of returning to the first transmission power control process is performed.
Inventors:
UCHIDA AKIYOSHI (JP)
Application Number:
PCT/JP2017/004869
Publication Date:
August 16, 2018
Filing Date:
February 10, 2017
Export Citation:
Assignee:
FUJITSU LTD (JP)
International Classes:
H02J50/12; H02J7/00; H02J50/40
Domestic Patent References:
| WO2016136566A1 | 2016-09-01 | |||
| WO2015151493A1 | 2015-10-08 |
Foreign References:
| JP2013062895A | 2013-04-04 |
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
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