A High Efficiency Boost-Buck Converter with Coupled Inductor for Thermoelectric Generator
Zhang Junjun1, Wu Hongfei1, Xing Yan1, Sun Kai2
1. Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and Astronautics Nanjing 210016 China; 2. Tsinghua University Beijing 100084 China
Abstract：A high efficiency Boost-Buck converter with coupled inductor (BBC-CI) is proposed for thermoelectric-generator (TEG) power system, where the converter is desired to interface the TEG with low current ripple under wide voltage range and high current. The BBC-CI is built with a Boost cell and a Buck cell cascaded, sharing an inverse coupled filter inductor. Benefiting from the DC magnetic flux counteract, reduced size and power loss of the filter inductor core are achieved with the proposed BBC-CI. Because both of the input and output currents are continuous, the interfacing filter capacitors can be reduced greatly. The operational principle, the influence of coupled inductor and its design considerations are analyzed in detail. The PWM strategy and constant voltage/constant current control strategy for free and seamless free mode transition are also given. A 500W prototype is built with experimental results given to verify the analysis.
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2014, Vol. 29 
