具有宽输出电压范围的LLCLC谐振变换器  

LLCLC resonant converter with wide output voltage

作　　者：王志新[1] 夏潇 龚春阳 包俊 朱国忠 WANG Zhi-xin;XIA Xiao;GONG Chun-yang;BAO Jun;ZHU Guo-zhong(Department of Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;College of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Shanghai Xilong Technology Co.,Ltd.,Shanghai 201517,China;Shanghai Chint Power System Co.,Ltd.,Shanghai 200210,China)

机构地区：[1]上海交通大学电气工程系,上海200240 [2]上海电力大学电气工程学院,上海200090 [3]上海禧龙科技股份有限公司,上海201517 [4]上海正泰电源系统有限公司,上海200210

出　　处：《电机与控制学报》2023年第1期12-22,共11页Electric Machines and Control

基　　金：国家重点研发计划(2018YFB1503000,2018YFB1503001);上海市科委科技计划(21DZ1207300);上海市经信委工业强基计划(2021)。

摘　　要：为了解决LLCLC谐振变换器增益对负载变化敏感、输出电压范围大小与转换效率相互制约的问题,提出一种基于脉冲宽度调制(PWM)倍压整流单元的LLCLC谐振变换器拓扑,对于不同的电压输出模式分别采用脉冲频率调制(PFM)和PWM调制方式;采用基波近似法分析LLCLC谐振网络的增益特性与功率传输特性,分析采用PWM调制方式时变换器的无功环流特性,建立谐振频率f_(r1)、f_(r3)和陷波频率fr2的关系,对谐振元件进行参数设计,分析开关管的零电压开通(ZVS)实现方法,并给出LLCLC谐振变换器的PFM_FR、PWM_FD和PWM_DT 3种运行模式切换策略。最后,针对一台容量250 W、输入30 V、输出18~112 V的样机进行实验,验证了所提LLCLC谐振变换器拓扑及其调制方法的有效性,输出电压范围为1~6.2,转换效率达到96.1%。In order to solve the problem that the gain of LLCLC resonant converter is sensitive to load changes, and the output voltage range and conversion efficiency are mutually restricted, a topology of LLCLC resonant converter was proposed based on pulse width modulation(PWM) voltage multiplying rectifier unit. Different voltage output modes were modulated by employing pulse frequency modulation(PFM) and PWM methods respectively;using the fundamental wave approximation method, the gain characteristics and power transmission characteristics of the LLCLC resonant network were analyzed, and analyzing the reactive power circulation characteristics of the converter when the PWM modulation method was used. Relationship between resonant frequency f_(r1),f_(r3)and notch frequency fr2were established. Parameters of the resonant elements was designed, zero-voltage switching(ZVS) implementation method of the switches was analyzed, and the transformation strategy of three operation modes PFM_FR, PWM_FD, and PWM_DT of the LLCLC resonant converter was also given. Finally, experiments were carried out on a prototype with a capacity of 250 W, an input of 30 V, and an output of 18~112 V to verify effectiveness of the proposed LLCLC resonant converter topology and its modulation method. The output voltage range is 1~6.2, and the conversion efficiency reaches 96.1%.

关 键 词：LLCLC 宽电压范围 脉冲宽度调制倍压整流单元 脉冲频率调制 运行模式 归一化增益 

分 类 号：TM46[电气工程—电器]