A Three-Port Multi-Element Resonant Converter with Decoupled Power Flow Management

A three-port multi-element resonant converter is developed in this paper. It contains multiple components, which leads to various resonant frequencies. Due to the appropriate placement of these frequencies, the transfer of the fundamental and the third harmonic active power are both guaranteed. Besides, a non-ideal isolated transformer is considered. A systematic procedure is proposed to reduce the coupling power between two input ports. Preferred parameters are easily selected by means of the small signal model established in this paper. In the end, a 750W prototype is built in the laboratory. The feasibility of the theoretical analyses is verified by experimental results. Zero-voltage-switching (ZVS) characteristics for all the switches of three ports are achieved. The highest efficiency is 96.3%.