| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a metal foreign matter detection method of a non-contact power supply device capable of detecting a metal foreign matter without changing an excitation frequency of a power supply coil of the non-contact power supply device, and being inexpensively manufactured, the non-contact power supply device, a power receiver provided to electrical equipment and a non-contact power supply system. <P>SOLUTION: An oscillation signal is transmitted from a metal detection circuit 33 provided to a power supply device 1 to a modulation circuit 16 of equipment E. In the modulation circuit 16 of the equipment E, a rectangular wave pulse signal is generated from the oscillation signal, a period of the rectangular wave pulse signal is changed based on presence/absence of a metal piece, and the rectangular wave pulse signal is modulated into a modulated wave signal to be transmitted to the metal detection circuit 33. In the metal detection circuit 33 of the power supply device 1, the modulated wave signal is demodulated, a period of the demodulated demodulation signal, namely, the rectangular wave pulse signal is measured to determine the presence/absence of the metal piece. <P>COPYRIGHT: (C)2013,JPO&INPIT |
