Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 12, Pages 8541-8551Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2016.2520963
Keywords
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
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Funding
- U.S. Department of Energy Graduate Automotive Technology Education Grant
- U.S.-China Clean Energy Research Center-Clean Vehicle Consortium
- DENSO International
- San Diego State University
- University of Michigan-Ann Arbor
- China Scholarship Council
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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.
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