LLC谐振变换器非对称变占空比软启动设计  

Soft-start Method With Asymmetric Variable Duty Cycle for LLC Resonant Converter

作　　者：冯兴田[1] 武大洲 郭玉江 FENG Xing-tian;WU Da-zhou;GUO Yu-jiang(China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东),新能源学院,山东青岛266580

出　　处：《电力电子技术》2024年第5期100-103,共4页Power Electronics

基　　金：国家自然科学基金(51977220);山东省自然科学基金(ZR2019MEE094)。

摘　　要：LLC谐振变换器在传统启动方法中存在浪涌电流过大的问题,为解决此问题,提出一种非对称变占空比的软启动混合控制策略。通过使两个桥臂的对管脉冲保持一致,同时使上、下开关管占空比保持互补导通,得到一种非对称变占空比的软启动方法,再与降频控制方法相结合组成了软启动混合控制策略。搭建了一台LLC谐振变换器实验样机验证方案的可行性。实验结果表明,所提出的混合控制策略能抑制启动过程中的电流冲击,并能保持初级开关管的零电压开通(ZVS)特性。The LLC resonant converter has the problem of excessive surge current in the traditional starting method,a soft-start hybrid control strategy with asymmetric variable duty cycle is proposed.By keeping the opposite pulse of the two bridge arms consistent,and keeping the duty cycle of the upper and lower switch transistor complementary at the same time,an asymmetric variable duty cycle soft-start method is obtained,and then combined with the frequency modulation control method to form a soft-start hybrid control strategy.An experimental prototype of LLC resonant converter is built to verify the feasibility of the scheme.The experimental results show that the proposed hybrid control strategy can suppress the current impulse during its start-up procedure and maintain the zero voltage switching turnon(ZVS)characteristic of the primary side switch transistor.

关 键 词：谐振变换器 浪涌电流 软启动 非对称变占空比 

分 类 号：TM46[电气工程—电器]