动态负载下E类逆变器零电压软开关分析及实现  

Analysis and Implementation of Zero Voltage Switching for Class E Inverter under Dynamic Load

作　　者：毛玲 尹伊凡 赵晋斌 孔德乐 张俊伟 Mao Ling;Yin Yifan;Zhao Jinbin;Kong Dele;Zhang Junwei(College of Electrical Engineering,Shanghai University of Electric Power,Shanghai,200090,China;Engineering Research Center of Offshore Wind Technology Ministry of Education,Shanghai University of Electric Power,Shanghai,200090,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]海上风电技术教育部工程研究中心(上海电力大学),上海200090

出　　处：《电工技术学报》2025年第7期2203-2214,共12页Transactions of China Electrotechnical Society

基　　金：上海市自然科学基金资助项目(21ZR1425300)。

摘　　要：针对E类逆变器在可变负载条件下难以维持开关管零电压开通(ZVS)状态而导致开关损耗及开关管结温过高等问题,该文提出一种可以适应动态负载变换范围的参数设计方案。该文基于E类逆变器功率及电压平衡关系对其电压波形特征进行分析,揭示了输入直流电流I与输出电流幅值I_m的比值β与电压波形对负载敏感度的关系。基于此,提出一种在动态负载变化范围内维持开关管ZVS的设计方案,并搭建了一台开关频率为500 kHz、输入电压为40 V、额定功率为20 W、额定负载为40?、负载变化范围为±20%的实验样机,验证了理论推导和设计方案的可行性,实现了E类逆变器在负载变化范围内均能实现ZVS软开关状态,且逆变器峰值效率达到了85.6%。The Class E inverter stands out due to its simple structure and application of resonant inverter technology,allowing it to operate stably in a zero voltage switching(ZVS)state.This characteristic significantly reduces switching losses,improves overall system efficiency,and effectively mitigates common penetration risks,making the circuit more reliable in high-frequency operating environments.However,maintaining the ZVS state of the Class E inverter under variable load conditions poses significant challenges,leading to considerable losses and imposing serious limitations on its application scenarios.Therefore,reducing the load sensitivity of Class E inverters is a key issue.This paper fully utilizes the continuous conduction characteristics of the MOSFET body diode to expand the feasible ZVS operating area of the Class E inverter.In-depth analysis shows that the ratioβbetween the input DC current I and the amplitude of the output current Im of the Class E inverter is significantly correlated with the range of load variation under ZVS conditions.This insight has led to the proposal of a parameter design scheme for the Class E inverter that can adapt to the range of dynamic load variations.First,this paper analyzes the operating process of the Class E inverter based on voltage and power balance and establishes a mathematical model.Subsequently,the body diode of the MOSFET is utilized to expand the feasible ZVS operating area of the Class E inverter.Building on this,the paper analyzes the characteristics of the switch voltage waveform changing with load variations.The analysis demonstrates that the value of parameterβsignificantly impacts the trajectory of the operating point of the Class E inverter within the ZVS feasible region.Subsequently,the paper conducts a comparative analysis of the peak voltage,peak current,and output power capabilities at different operating points.Finally,based on the results of the aforementioned analysis,this paper proposes a design scheme for the parameters of the Class E inverter tha

关 键 词：E类逆变器 开关损耗 动态负载 零电压开通 

分 类 号：TM464[电气工程—电器]