POWER TRANSMITTER, RESONANCE-TYPE CONTACTLESS POWER SUPPLY AND CONTROL METHOD THEREFOR

摘要

The present disclosure relates to a power transmitter, a resonance-type contactless power supply and a control method. The resonance-type contactless power supply adjusts a phase difference of an inverter control signal in a current cycle in a manner the same as that in a previous cycle in a case that a power parameter in the current cycle and that in the previous cycle satisfy a predetermined relationship, and adjusts the phase difference of the inverter control signal in the current cycle in a manner opposite to that in the previous cycle in a case that the power parameter in the current cycle and that in the previous cycle don't satisfy the predetermined relationship. The power parameter represents system efficiency. Thus, a suitable input current or voltage of the transmitter-side resonant circuit is determined by scanning actually, so that the system can operate at optimal efficiency.

主权项

1. A resonance-type contactless power supply, comprising:
an inverter circuit configured to receive electric energy and output an AC current with a self-inductance resonance frequency in accordance with an inverter control signal; a transmitter-side resonant circuit comprising a transmitting coil for transmitting electric energy; a receiver-side resonant circuit comprising a receiving coil which is separated from but electrically coupled to said transmitting coil in a contactless manner, and configured to receive electric energy from said transmitting coil; a rectifier circuit being electrically coupled to said receiver-side resonant circuit for converting an AC current from said receiver-side resonant circuit to a DC current; and a control circuit configured to adjust a phase difference of said inverter control signal in a current cycle in a manner the same as that in a previous cycle in a case that a power parameter in said current cycle and that in said previous cycle satisfy a predetermined relationship, and adjust said phase difference of said inverter control signal in said current cycle in a manner opposite to that in said previous cycle in a case that said power parameter in said current cycle and that in said previous cycle don't satisfy said predetermined relationship, wherein said power parameter represents a difference between an input power of said inverter circuit and an output power of said rectifier circuit, or a ratio of said input power of said inverter circuit to said output power of said rectifier circuit.