A Miniaturized Single-Ended Wireless EV Charger with New High Power-Factor Drive and Natural Cooling Structure

Abstract

This paper deals with a miniaturized wireless EV charger with a new high power-factor drive and natural cooling structure that incorporates the simple quasi-resonant single-ended inverter. In the first place, the operating principle of a wireless EV charger using the one switch inverter is described. This type of wireless resonant EV charger can efficiently operate under zero volt switching (ZVS). In the second place, a low-cost small-size high power-factor drive method is proposed. In a new high power-factor drive wireless EV charger with a non-smoothing pulsating voltage fed inverter, ripple components are absorbed in EV battery at the final stage of the system, while they are usually absorbed in a large smoothing capacitor before the inverter. Illustrated is that AC input current is expected to have high power-factor and low total harmonic distortion (THD). Finally, described is a design of high-density power implementation with a new natural cooling construction for achieving high reliability. All generated heat in the unit is dissipated through a unit case. Thanks to this study, the volume and weight of converter are extremely decreased, and solve the problem of power factor and cooling.