Input-Voltage Extension Method of Half-Bridge LLC Converter Based on Magamp
Jin Xiaoguang1, Wan Lanruo1, Xu Jun2, Qian Bin2, Lü Zhengyu1
1. State Key Laboratory of Power Electronics Zhejiang University Hangzhou 310027 China; 2. Shanghai Institute of Space Power-Sources Shanghai 200245 China
Abstract：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 input-voltage 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.
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2018, Vol. 33 
