Pulse Width Modulation-Controlled Switching Impedance for Wireless Power Transfer

Bole Ma, Lin Chai, Jianghua Lu () and Shixiong Sun
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Bole Ma: College of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Lin Chai: College of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Jianghua Lu: College of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Shixiong Sun: College of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

Energies, 2023, vol. 16, issue 24, 1-16

Abstract: The exceptional performance of the wireless power transfer (WPT) system hinges on its resonant state. However, the capacitance drift caused by manufacturing tolerance and temperature will result in a state of detuning. In this manuscript, a PWM-controlled switched impedance (PCSI) topology that can express inductive and capacitive is proposed to eliminate line mismatches resulting from the above factors. Firstly, the PCSI topology is introduced, and its placement is determined based on the characteristics of the inductor–capacitor–capacitor series (LCC-S) network. Secondly, the working principle of the proposed topology is introduced. Finally, the simulation and experimental results show that the system could be restored to its resonant state by adjusting the PCSI topology. Under different values of resonant capacitors, the PCSI topology enhances the output power of the system by 40 W~150 W compared to the previous state, and the efficiency is increased by 9~13%.

Keywords: wireless power transfer; PWM-controlled switched impedance (PCSI); line tuning; capacitor drift (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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