| 摘要 |
A power receiving coil (13) in a power receiving device (3) receives the supply of energy from a power transmitting coil (12) in a power transmitting device (2) by using magnetic field resonance. The energy in the power receiving coil (13) is taken out as electric power by either of power taking-out coils (14_1 to 14_4) selected by a switch (31) and is used for charging a battery (34). A control circuit (35) selects either of the power taking-out coils (14_1 to 14_4) according to the state of charge of the battery (34), thereby improving the charging efficiency of the battery (34). |
