A novel type of high power-factor miniaturized wireless ev charger with optimized power receiving circuit and single-ended inverter

This paper deals with a cost effective wireless EV battery charger which incorporates the simplest quasi-resonant soft switching pulse modulated inverter. In the first place, the operating principle of a wireless EV charger using a class-E single-ended inverter is described. This type of wireless resonant EV charger can efficiently operate under a condition of class-E switching controlled by synchronized PWM drive. In the second place, illustrated is a comparative study of wireless power transfer circuits. Power receiving circuit is optimized successfully from a viewpoint of transfer power. Furthermore a low-cost power-factor correction by active filtering is described herein. The waveform of the input current in pilot study of this wireless EV charger has very low harmonic distortion by the PFC control of the inverter and the design of the filter circuit parameters.