基于新型八开关七电平逆变器的高效WPT系统

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关键词：无线电能传输；效率优化；最大效率追踪；七电平逆变；耦合系数估计DOI：10.15938/j. emc. 2025.11.012中图分类号：TM724 文献标志码：A 文章编号：1007-449X（2025）11-0120-13

Efficient WPT system based on new eight-switch seven-level inverter

HANG Yufang'， SHEN Quan¹， RAO Tianbiao¹， YAN Huaicheng²， HUANG Wencong （1 Hubei KeyLaboratory for High-effciency Utilizationof Solar Energyand Operation Control of Energy Storage System， Hubei Universityof Technology，WuHan 430068，China；2.School of Information Science and Engineering， East China University of Science and Technology，Shanghai 2OO237，China）

Abstract：The wireless power transfer（WPT） system exhibits a low output fundamental wave component， resulting in reduced transmission efficiency and susceptibility to fluctuations caused by variations in coupling coeficient and load. To addressthe above issues，a WPT system based on a novel eight-switch seven-level inverter and its maximum eficiency tracking strategy were proposed.Firstly，focusing on the LCC-S topology，the relationship between system parameters and transmission efficiency was analyzed. Secondly，based on a comparison of the fundamental components of high-frequency inverters with different output levels in WPT systems，a new eight-switch seven-level inverter topology was proposed and the switching tube angles was optimized accordingly. It has been demonstrated that the topology can optimize the efficiency of the WPT system. Subsequently，a real-time equation for the coupling coeficient was derived and a compound maximum eficiency tracking strategy was introduced. By acquiring voltage and current signals from the system in real-time，the coupling coefficient was estimated and a Buck-Boost circuit to achieve impedance matching that meets maximum efciency tracking requirements under changes in both coupling coefficient and load conditions was employed. Finally，an experimental platform was constructed to validate the high-efficiency characteristics as wellas efficient tracking capabilities of this system.

Keywords ： wireless power transfer; efficiency optimization； maximum efficiency tracking； seven-level inverter；coupling coefficient estimation

0引言

无线电能传输（wirelesspowertransfer，WPT）系统由于其无需用电设备与电源之间的直接电气连接，解决了传统有线充电可能出现的安全问题，具有高可靠性和易便携性，已经在许多领域得到广泛应用，如消费电子产品、可植入医疗设备、水下设备以及电动汽车等[1-5]

效率是WPT在应用过程中最重要的性能指标之一。（剩余16757字）