A Double-Input Boost-Buck Converter with Coupled Inductors
Zhang Junjun1, Sun Kai2, Wu Hongfei1, Cao Feng1, Xing Yan1
1. Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu 210016 China; 2. State Key Lab of Power Systems Tsinghua University Beijing 100084 China
Abstract：A double-input Boost-Buck converter with coupled inductors(DIBBC-CI) is proposed for thermoelectric generator(TEG) power system, where the converter is desired to interface the TEG with low current ripple under wide input voltage range. The DIBBC-CI is built with two Boost converters and a Buck converter cascaded, sharing the inverse coupled filter inductors. Benefiting from the DC magnetic flux counteract, reduced size and power loss of the filter are achieved. The MPPT/ constant voltage/constant current control strategy for free and seamless mode transient and distributed maximum power point tracking(DMPPT) are also proposed. The operational principle, the influence of coupled inductor and its design considerations are analyzed in detail. A 450W prototype is built with experimental results to verify the analysis.
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2015, Vol. 30 
