Capacitor Isolated Vehicle-to-Vehicle Energy Sharing Converter Based on Electric Vehicle Motor Winding and Inverter

Vehicle-to-vehicle (V2V) energy sharing is an approach that can help alleviate the range anxiety of electric vehicle (EV) drivers because it can solve the “last kilometer” problem that can prevent an EV with a low charged battery arriving at a destination or a charging station. V2V chargers utilizing the motor winding and inverter are preferred because they can achieve higher transmission powers at no extra cost. However, compared with onboard chargers that use isolation transformers to share energy between vehicle and vehicle, these converters (that make use of the motor winding and inverter) provide no isolation and cannot stop the propagation of a fault from one vehicle to the other. To solve this problem, a capacitor-isolated V2V converter that utilizes the drive motor winding and inverter is proposed in this paper, based on the principle of capacitor isolation in the gate driver chip. A 400W laboratory prototype is used to experimentally verify the performance and feasibility of the proposed method.