A Four-Plate Compact Capacitive Coupler Design and LCL-Compensated Topology for Capacitive Power Transfer in Electric Vehicle Charging Application

作者：Zhang, Hua^*; Lu, Fei; Hofmann, Heath; Liu, Weiguo; Mi, Chunting Chris

来源：IEEE Transactions on Power Electronics, 2016, 31(12): 8541-8551.

DOI：10.1109/TPEL.2016.2520963

• Capacitive power transfer
• electric coupling
• electric field
• electric vehicle (EV) charging
• equivalent capacitor model
• four-plate structure
• high-frequency wireless power transfer
• LCL compensation topology

This paper proposes a four-plate compact capacitive coupler and its circuit model for large air-gap distance capacitive power transfer (CPT). The four plates are arranged vertically, instead of horizontally, to save space in the electric vehicle charging application. The two plates that are on the same side are placed close to each other to maintain a large coupling capacitance, and they are of different sizes to maintain the coupling between the primary and secondary sides. The circuit model of the coupler is presented, considering all six coupling capacitors. The LCL compensation topology is used to resonate with the coupler and provide high voltage on the plates to transfer high power. The circuit-model of the coupler is simplified to design the parameters of the compensation circuit. Finite-element analysis is employed to simulate the coupling capacitance and design the dimensions of the coupler. The circuit performance is simulated in LTspice to design the specific parameter values. A prototype of the CPT system was designed and constructed with the proposed vertical plate structure. The prototype achieved an efficiency of 85.87% at 1.88-kW output power with a 150-mm air-gap distance.

• 出版日期2016-12
• 单位西北工业大学