双向LLC谐振变换器混合控制策略研究  

Research on Hybrid Control Strategy of the Bidirectional LLC Resonant Converter

作　　者：陈桂涛[1] 王宇鹏 任碧莹[1] 孙向东[1] CHEN Gui-tao;WANG Yu-peng;REN Bi-ying;SUN Xiang-dong(Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学,电气工程学院,陕西西安710048

出　　处：《电力电子技术》2021年第5期1-3,44,共4页Power Electronics

基　　金：国家自然科学基金(51577155);西安理工大学博士启动金(103-451119007)。

摘　　要：针对双向半桥LLC谐振变换器在脉冲频率调制(PFM)下存在电压增益范围较窄的缺点,研究了一种PFM-非对称脉冲宽度控制(APWM)混合控制策略。该策略在PFM的基础上,当电压增益小于1时,采用APWM进行输出电压调节,从而有效扩展了变换器电压增益调节范围,并且可以实现全范围零电压开关(AVS)。详细分析了APWM策略下变换器的工作原理、增益及软开关条件,并搭建了一台500 W实验样机,实验结果验证了该策略的可行性和优越性。Aiming at the shortcoming of the narrow voltage gain range of the bidirectional half-bridge LLC resonant converter under pulse frequency modulation(PFM),a PFM-asymmetric pulse width modulation(APWM)hybrid control strategy is studied.This strategy is based on PFM,when the voltage gain is less than 1,the APWM is used to regulate the output voltage,which effectively expands the voltage gain adjustment range of the converter and can realize fullrange zero-voltage switching(ZVS).The working principle,voltage gain and soft switching condition of the converter under the APWM strategy are analyzed in detail.A 500 W experimental prototype is built,and the experimental results verify the feasibility and superiority of the strategy.

关 键 词：变换器 脉冲频率调制 非对称脉冲宽度调制 

分 类 号：TM46[电气工程—电器]