NON-CONTACT POWER TRANSMISSION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a non-contact power transmission circuit which can reduce standby power.SOLUTION: A resonance circuit 11 includes a power transmission coil T1 to transmit power to a power receiver 2 and a resonance capacitor C4 to resonate with the power transmission coil T1. A switching element FET resonates the resonance circuit 11 by repeating ON-OFF. A driving circuit 12 detects whether the power receiver 2 is mounted on a mounting part or not based on a voltage of the power transmission coil T1. When it is detected that the power receiver 2 is not mounted, the switching element FET is driven so that a term of causing the switching element FET to be ON is shorter than when the power receiver 2 is mounted.