Wireless Power Transfer System with the Auxiliary Resonant Commutated Pole Converter for Reducing Radiated Emission

Wireless power transfer systems improve the convenience for EV users. However, the WPT systems generate the radiated emission caused by current harmonics that interfere with wireless communications. To solve this problem, this paper proposes a WPT system with an auxiliary resonant commutated pole (ARCP) converter with selective harmonic elimination (SHE) on the primary and secondary sides. The ARCP converter suppresses the increasing switching losses on main devices, and the SHE-PWM reduces coil current harmonics components that cause radiated emissions. Furthermore, the proposed system controls a constant boost current to minimize losses in the auxiliary circuit. In this paper, the switching phases are numerically analyzed in order to eliminate the low-order harmonics voltage of the converter output voltage. Then, the operation of the proposed system is demonstrated by simulation and experiment. As a result, it is confirmed that the harmonics below the 13th order are reduced by more than 40 dB in the simulation. In addition, the experimental results with the prototype of the three-pulse SHE-PWM mention that all switching achieved zero voltage switching.