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基于E類功放的恒壓和寬范圍ZVS型CPT系統(tǒng)研究

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DOI:10.15938/j. emc.2025.04.009

中圖分類號(hào):TM724 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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

電容式無線電能傳輸(capacitivepower transfer,CPT)技術(shù)[1-3]是一種使用金屬板或箔作為耦合接口,交變電場作為功率傳輸介質(zhì)的無線電能傳輸(wirelesspower transfer,WPT)技術(shù)[4-5]。(剩余14441字)

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