WIRELESS ELECTRICAL POWER TRANSMISSION SYSTEM AND ITS CONTROL METHOD

摘要

The present invention provides a wireless electrical power transmission system and its control method with good thermal stability. Said system, comprising a transmitting coil frequency generating part and a coil frequency phase tracking feedback part, the transmitting coil frequency generating part composed of a control circuit, a driving circuit and a inverter circuit, the coil frequency phase tracking feedback part composed of a frequency detection circuit and a phase locked loop circuit, is characterized in that said control circuit is controlled by software to output two entirely opposite control signals, which respectively control opening and closing of one switch transistor through the driving circuit to generate high frequency oscillation in the coil. Through controlling the system by the software, frequency point drift caused by the parameters of the component itself and that of the environment temperature is reduced, the frequency point and alternating current frequency characteristic of the wireless electrical power transmission circuit are precisely controlled, the heating problem of the critical component is reduced, and the efficiency of the wireless electrical power transmission circuit is improved.