Three-Port Magnetically Coupling Resonant Wireless Energy Router And Its Zero-Power-Flow Control Scheme

Nowadays, bidirectional wireless power transfer (BWPT) technology has caused increasingly concern, but its application is greatly limited when the number of sources and loads increases. In this paper, the concept of multi-port wireless energy router (Wi E-Router) is proposed to realize energy transfer wirelessly among multiple sources and loads for the multi-source and multi-load wireless power transfer (WPT) applications. Specifically, a three-port magnetically coupling resonant (MCR) Wi E-Router with LCC hybrid compensation network is investigated in detail. The equivalent circuit model of the three-port Wi E-Router is built and the power transfer characteristics are analyzed. Based on the circuit model, the relationships between the power magnitude as well as flowing direction and the shifted phase among or inside multiple ports are revealed. Moreover, a zero-power-flow control scheme is put forward for the case when one port quits from the system. By regulating the outer shifted phase, the power transfer among other ports can still be realized when the idling port achieves zero power flow. Finally, the validity of the above theoretical analysis is verified by experiments.