Simulation-Assisted Design Process of a 22 kW Wireless Power Transfer System Using Three-Phase Coil Coupling for EVs

Chia-Hsuan Wu, Ching-Ming Lai, Tomokazu Mishima and Zheng-Bo Liang
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Chia-Hsuan Wu: Department of Electrical Engineering, National Chung Hsing University, Taichung 402, Taiwan
Ching-Ming Lai: Department of Electrical Engineering, National Chung Hsing University, Taichung 402, Taiwan
Tomokazu Mishima: Department of Marine Technologies and Engineerings, Faculty of Oceanology, Kobe University, Kobe 12885, Japan
Zheng-Bo Liang: Department of Electrical Engineering, National Chung Hsing University, Taichung 402, Taiwan

Sustainability, 2021, vol. 13, issue 21, 1-15

Abstract: The objective of this paper is to study a 22 kW high-power wireless power transfer (WPT) system for battery charging in electric vehicles (EVs). The proposed WPT system consists of a three-phase half-bridge LC–LC (i.e., primary LC/secondary LC) resonant power converter and a three-phase sandwich wound coil set (transmitter, Tx; receiver, Rx). To transfer power effectively with a 250 mm air gap, the WPT system uses three-phase, sandwich-wound Tx/Rx coils to minimize the magnetic flux leakage effect and increase the power transfer efficiency (PTE). Furthermore, the relationship of the coupling coefficient between the Tx/Rx coils is complicated, as the coupling coefficient is not only dominated by the coupling strength of the primary and secondary sides but also relates to the primary or secondary three-phase magnetic coupling effects. In order to analyze the proposed three-phase WPT system, a detailed equivalent circuit model is derived for a better understanding. To give a design reference, a novel coil design method that can achieve high conversion efficiency for a high-power WPT system was developed based on a simulation-assisted design procedure. A pair of magnetically coupled Tx and Rx coils and the circuit parameters of the three-phase half-bridge LC–LC resonant converter for a 22 kW WPT system are adjusted through PSIM and CST STUDIO SUITE™ simulation to execute the derivation of the design formulas. Finally, the system achieved a PTE of 93.47% at an 85 kHz operating frequency with a 170 mm air gap between the coils. The results verify the feasibility of a simulation-assisted design in which the developed coils can comply with a high-power and high-efficiency WPT system in addition to a size reduction.

Keywords: 22 kW wireless power transfer (WPT) system; three-phase (LC) (LC) resonant converter; sandwich coil coupling; circuit model; CST STUDIO SUITE™; PSIM (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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