Uniform Power IPT System With Three-Phase Transmitter and Bipolar Receiver for Dynamic Charging

Dynamic inductive power transfer (DIPT) system has attracted a lot of attention from researchers, as it can reduce charging anxiety and extend the distance traveled for electric vehicles. Power fluctuation is one of the toughest drawbacks for DIPT because of the coupling coefficient's variation between the transmitters and receivers. In order to overcome this, a three-phase inverter based DIPT with a single-phase receiver is proposed to get a constant voltage gain by being reversed connected to double D coil. The length of the receiver coil is optimized to decrease the variation of the equivalent of mutual inductances by three-dimensional (3-D) finite-element analysis tool ANSYS MAXWELL. A 500 W DIPT prototype is established based on the optimized coil structure to evaluate the proposed approach. The results show that the variation of the output voltage is within ±1.17% during various positions. The overall dc/dc system efficiency is from 92.02% up to 93.41%.