Passive Paralleling of Multi-Phase Diode Rectifier for Wireless Power Transfer Systems
Yiming Zhang, Yuanchao Wu, Chao Liu, Zhiwei Shen, Hui Wang, Wenbin Pan, Xingkui Mao, Zhongqi Li
Abstract
To improve the power level of a diode rectifier, a multi-phase diode rectifier can be employed to increase the current rating. This brief proposes a passive current balancing method for a multi-phase diode rectifier in a series-series compensated wireless power transfer system. For an N-phase diode rectifier, the receiver-side compensating capacitance is split into N branches, forming a parallel resonant network with the newly added parallel resonant inductors. The circulating currents can be greatly suppressed by the parallel resonant network. The resonant inductors only withstand differential-mode currents, which are small. Thus, these inductors are small and low-cost. Experimental results reveal that the proposed method can well balance the phase currents of the three-phase diode rectifier.