Patent ID: 9590428
Date: 2017-03-07
CPC Classifications: H02J

Claim:
1. An electric power receiving device comprising: an electric power receiving section comprising a pair of output terminals and a secondary coil to be electromagnetically coupled to a primary coil through which a first alternating current flows, the electric power receiving section being configured to output, via the pair of output terminals, an alternating voltage that is based on an induced electromotive force generated in the secondary coil; and a converting section configured to convert the alternating voltage outputted from the electric power receiving section into a direct voltage, wherein the converting section comprises a compensation voltage generating section configured to generate a compensation voltage having a frequency approximately equal to that of the alternating voltage and being capable of canceling out a reactance component in the electric power receiving section, and to apply the compensation voltage between the pair of output terminals, wherein the compensation voltage generating section comprises: a phase changing section configured to change a phase of the compensation voltage to be applied between the pair of output terminals in a specified change pattern; a physical quantity detecting section configured to detect a specified physical quantity changed with change of the phase of the compensation voltage by the phase changing section; and a searching section configured to search a target phase of the compensation voltage that brings the electric power receiving device into a substantially resonant state, based on the physical quantity detected by the physical quantity detecting section, and wherein the compensation voltage generating section is configured to determine the compensation voltage having the target phase searched by the searching section as the compensation voltage to be applied between the pair of output terminals.