New IPT-wireless EV charger using single-ended quasi-resonant converter with power factor correction

Abstract

This paper deals with a cost effective IPT wireless EV battery charger for smart house, which incorporates the simplest quasi -resonant soft switching pulse modulated inverter using the latest SiC-MOSFET into high-frequency isolated DC-DC converter. In the first place, the operating principle of the single-ended high-frequency resonant inverter linked planar coupling IPT DC-DC converter treated here is described by using the switch-mode equivalent circuits and working waveforms. This two planar coupling coils type wireless resonant DC-DC converter can efficiently operate under a condition of ZVS transitions on the basis of the self-excited pulse processing scheme due to zero voltage detecting method of quasi-resonant capacitor voltage. In addition to this, PWM-based adaptive PFM control strategy implemented into this self-excited resonant inverter link DC-DC converter is briefly pointed out. In the second place, illustrated are the design example and gap dependent circuit parameters of two planar coupling inductive coil units; power feeding coil and power receiving coil parts with individual ferrite core. In the third place, the experimental setup prototype of low cost, downsizing and high-frequency IPT wireless battery charger using high frequency quasi-resonant inverter linked DC-DC converter using promising SiC-MOSFET is demonstrated, which is actually built and tested for EV/HEV battery charging equipment. Finally, the steady-state operating performances such as output current vs. output voltage relationships with variable gap distances and output power vs. output voltage relations as well as efficiency vs. gap distance relations are evaluated for wireless EV charging system from a practical point of view. Moreover, its active filtering performance is discussed herein.