基于E类功放的恒压和宽范围ZVS型CPT系统研究

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DOI：10.15938/j. emc.2025.04.009

中图分类号：TM724 文献标志码：A 文章编号：1007-449X（2025）04-0087-11

Research on Class-E power amplifier based capacitive power transfer system with constant voltage output and wide-range ZVS

ZHOU Wei1， CHEN Zelin1，LI Zhiqiang1， LI Mengmeng1， XU Dehao²， MAI Ruikun' （1.School of Electrical Engineering， Southwest Jiaotong University， Chengdu 611756，China; 2. Wuhu Fanchang Power Supply Company，State Grid Anhui Electric Power Co.，Ltd.，Wuhu 24120o，China）

Abstract：To address the issue that the output and zero-voltage switching （ZVS） characteristics of ClassE power amplifiers in capacitive power transfer（CPT） systems are afected by the load impedance and circuit parameters，the quasi-constant voltage and wide-range ZVS characteristics of a CPT system were investigated based on a Class-E power amplifier.Numerical，frequency-domain，and time-domain modeling approaches were employed to establish mathematical models of the high-frequency full-bridge rectifier，capacitive coupler，and Class-E power amplifier. Furthermore，the critical ZVS condition equations and constant-voltage output conditions for the Class-E power amplifier were formulated. Then a parameter design and diode selection methods were proposed to achieve quasi-constant voltage output and wide-range ZVS operation. A 72 W prototype was established，and experimental results show that the system maintains soft-switching operation with an output voltage fluctuation rate of only 6.68% across a load range of to ，while achieving a peak efficiency of 88.0% . These experimental results validate effectiveness of the proposed system design and device selection approach.

Keywords： Class-E power amplifier； capacitive; wireless power transfer; constant voltage； zero-voltageswitching；diode selection

0引言

电容式无线电能传输（capacitivepower transfer，CPT）技术[1-3]是一种使用金属板或箔作为耦合接口，交变电场作为功率传输介质的无线电能传输（wirelesspower transfer，WPT）技术[4-5]。（剩余14441字）