CLLC谐振变换器同步整流软开关失效分析与应对  

Soft-switching failure analysis and countermeasures for synchronous rectification of CLLC converter

作　　者：张国澎[1] 孙新迪 王浩 刘永辉 陶海军[1] 黄鹭鹭 ZHANG Guopeng;SUN Xindi;WANG Hao;LIU Yonghui;TAO Haijun;HUANG Lulu(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454003,China;State Grid Shanghai Energy Interconnection Research Institute Co.,Ltd.,Shanghai 201210,China)

机构地区：[1]河南理工大学电气工程与自动化学院,河南焦作454003 [2]国网上海能源互联网研究院有限公司,上海201210

出　　处：《电机与控制学报》2024年第8期143-151,共9页Electric Machines and Control

基　　金：河南省自然科学基金(212300410147);河南省高校基本科研业务费专项资金(NSFRF210423);河南省科技攻关项目(202102210294)。

摘　　要：同步整流(SR)是提高CLLC谐振变换器运行效率的有效方法,但由于功率管寄生电容等因素的影响,同步整流存在软开关失效的风险。因此,为同时实现同步整流和软开关,在变换器副边不控整流的基础上,分析了不同运行状态下同步整流软开关的失效原因,以及软开关实现的有效范围。提出了不同运行状态下的同步整流数字控制方法,可在保证实现同步整流软开关的同时,提高同步整流的运行范围,从而保证变换器在不同运行状态下的运行效率。同时,改进了不同运行状态下同步整流开通和关断时刻的计算方法,使得同步整流的控制无需电流传感器和其他额外硬件电路的参与,可应用于原本无同步整流控制相关硬件的双向CLLC谐振变换器中。搭建了实验平台,验证了所提方法的有效性。Synchronous rectification(SR)is an effective method to improve the operational efficiency of CLLC resonant converters,However,due to factors such as parasitic capacitance of power transistors,there is a risk of soft-switching failure in SR.To achieve both SR and soft-switching simultaneously,based on uncontrolled rectification on the secondary of the converter,the failure reasons of the SR softswitching under different operating states were analyzed,as well as the effective range of soft-switching implementation.A digital control method for SR under different operating states was proposed,which can improve the operating range of SR while ensuring the implementation of SR soft-switching,thereby ensuring the operating efficiency of the converter in different operating states.At the same time,the calculation method for the ON and OFF times of SR under different operating states was improved,so that the control of SR does not require the participation of current sensors and other additional hardware circuits,and can be applied to bidirectional CLLC resonant converters that originally did not have SR control related hardware.An experimental platform was built to verify effectiveness of the proposed method.

关 键 词：CLLC谐振变换器 同步整流 软开关 运行效率 软开关失效 寄生电容 

分 类 号：TM46[电气工程—电器]