| 摘要 |
PROBLEM TO BE SOLVED: To quickly and safely detect a foreign object, which is implemented with a simple circuit configuration while reducing manufacturing costs.SOLUTION: A contactless power supply method comprises performing electromagnetic coupling between a power transmission coil 11 of a power supply stand 10 and a power reception coil 51 of a mobile apparatus 50 to perform power transmission by using electromagnetic induction action. The mobile apparatus 50 transmits a power increase/decrease request signal to the power supply stand 10, and the power supply stand 10 adjusts an output of the power transmission coil 11 based on the increase/decrease request signal and supplies power to the mobile apparatus 50. The mobile apparatus 50 compares a received power from the power supply stand 10 with a required power, when the received power is lower than the required power, an increase request signal is transmitted to the power supply stand 10, and when the received power is higher than the required power, a decrease request signal is transmitted to the power supply stand 10. The increase/decrease request signal contains either or both of an increase request of weight points increased according to the magnitude of request value and the amount of change of weight points increased according to the magnitude of the change value of the request value, and when reaching to a preset point by adding weight points output in a prescribed period, it is determined that a foreign object is set on the power supply stand. |
