基于磁放大器的半桥LLC变换器输入电压范围扩展方法  

Input-Voltage Extension Method of Half-Bridge LLC Converter Based on Magamp

作　　者：靳晓光[1] 万兰若 徐军[2] 钱斌[2] 吕征宇[1] Jin Xiaoguang;Wan Lanruo;Xu Jun;Qian Bin;LüZhengyu(State Key Laboratory of Power Electronics Zhejiang University Hangzhou 310027 China;Shanghai Institute of Space Power-Sources Shanghai 200245 China)

机构地区：[1]电力电子国家专业实验室(浙江大学),杭州310027 [2]上海空间电源研究所,上海200245

出　　处：《电工技术学报》2018年第21期5026-5035,共10页Transactions of China Electrotechnical Society

摘　　要：提出一种基于磁放大器的半桥LLC变换器输入电压范围扩展策略。在输入电压范围比较低时,磁放大器不被使能,变换器的工作状态和传统LLC变换器相同。当输入电压较高时,磁放大器工作在辅助整流方式。通过调整磁放大器的阻断时间来扩展变换器的直流增益调整范围,从而扩展变换器的输入电压范围。对所提出变换器的主要工作原理进行了详细分析,并给出磁放大器的设计方法。最后,通过一台160～300 V输入、25 V输出、最大功率为400 W的实验样机对该策略的可行性和理论的正确性进行了验证。An improved half-bridge LLC converter with magamp auxiliary post-regulator is proposed in this paper.The function of magamp is disabled when the converter works within low inputvoltage range,whereas it operates as an auxiliary post-regulator when the input-voltage is high.By changing the magamp’s blocking time,the DC gain of the converter can be extended accordingly.Hence,the input-voltage range of the converter is extended.The generalized operational principle is analyzed and the design criterion for the magamp is presented.Finally,a 25 V output,400 W experimental prototype was built and tested for a 160–300 V input-voltage range to verify the theoretic and feasibility of the proposed method.

关 键 词：LLC 变换器 谐振 宽范围 磁放大器 

分 类 号：TM46[电气工程—电器]