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1. (WO2018221532) POWER TRANSMISSION DEVICE, WIRELESS POWER TRANSMISSION SYSTEM, AND CONTROL DEVICE

Pub. No.:    WO/2018/221532    International Application No.:    PCT/JP2018/020611
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Wed May 30 01:59:59 CEST 2018
IPC: H02J 50/12
H02J 7/00
H02J 50/10
H02M 7/48
Applicants: NIDEC CORPORATION
日本電産株式会社
Inventors: QI,Liang
斉 亮
Title: POWER TRANSMISSION DEVICE, WIRELESS POWER TRANSMISSION SYSTEM, AND CONTROL DEVICE
Abstract:
[Problem] To control power transmission according to the state of a power reception device without performing communication from the power reception device to a power transmission device. [Solution] A power transmission device comprises: an inverter circuit; a power transmission resonator; a measurement device; and a control circuit. The measurement device measures an input voltage or an output voltage of the inverter circuit, and measures an input current or an output current of the inverter circuit. During power transmission, the control circuit: changes the voltage value of an alternating current power output from the inverter circuit from a first voltage value to a second voltage value; acquires first measured values and second measured values of the voltage and the current measured by the measurement device before and after the change; determines a third voltage value by a process which includes calculation using the first and second measured values; and outputs an alternating current power having the third voltage value from the inverter circuit so as to continue the power transmission.