Abstract
ABSTRACT The efficiency of a multiphase wireless power transfer (WPT) system varies with the size and position of loads. Based on the traditional WPT system, the efficiency improvement of three-phase WPT system under load variation was studied. A three–phase shift control (PSC) strategy is proposed. Mathematical formula of optimal resistance is deduced and the optimal phase shift angles (PSA) for maximum efficiency are presented in the three-phase WPT system. Through the analysis of the electromagnetic model of the system, the optimal phase angle at which the load maintains optimum efficiency at different locations is deriving. A three-phase WPT phase experimental platform based on PSC is built. Verify the validity and correctness of PSC strategy. Simulation and experimental results show that the efficiency of the receiving coil can be increased by 10−15% after the phase is adjusted at different positions. The proposed three-phase phase shift control strategy has a guiding and reference significance for subsequent related research.
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