IMPEDANCE MATCHING METHOD OF NON-CONTACT POWER SUPPLY DEVICE, AND NON-CONTACT POWER SUPPLY DEVICE USING SAME

摘要

PROBLEM TO BE SOLVED: To provide a general-purpose method for efficient impedance matching of a resonance type non-contact power supply device.SOLUTION: A non-contact power supply device transfers electric power from an AC power source to a load. In the impedance matching method for a non-contact power supply device of electromagnetic field resonance method, the resonance frequency of a power transmitting resonance coil and a power receiving resonance coil is allowed to almost agree with an output frequency fo of the AC power source, so that an electromagnetic field resonance is generated by the electromagnetic field coupling between the power transmitting resonance coil and the power receiving resonance coil. The AC power which the AC power source has inputted into a power transmission matching circuit is transferred to the power receiving resonance coil by the electromagnetic field resonance between coils, which is then outputted to a load. Further, two elements are adjusted among three elements, namely, an input resistance Rti which a power transmission part has under non-resonance state, an input resistance Rri which a power reception part has under non-resonance state, and a mutual inductance M caused by coupling between the power transmission part and the reception part, so that the impedance of the non-contact power supply device under a resonance state is adjusted.