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Analysis and Design of a Function Decoupling High Voltage Gain DC/DC Converter
Yuqi Wei*, Quanming Luo˘Ó, Xingyu Lv *, Pengju Sun*, and Xiong Du*
Abstract It is difficult for a traditional Boost converter to realize high efficiency and high voltage gain conversion due to the following drawbacks: 1) extremely large duty cycle; 2) high voltage and current stresses on devices; 3) low conversion efficiency. Therefore, a function decoupling high voltage gain DC/DC converter composed of a DC transformer (DCX) and an auxiliary converter is proposed, where the role of DCX is to realize fixed gain conversion with high efficiency, while the role of auxiliary converter is to achieve output voltage regulation. In this paper, different forms of combined high voltage gain converters are compared and analyzed, and the structure for the function decoupling high voltage gain converter is selected. Then, topologies and control strategies for DCX and auxiliary converter are discussed. Based on the discussion, an optimal design method for circuit parameters is proposed, and design procedures for DCX are described in detail. Finally, a 400W experimental prototype based on the proposed optimal design method is built to verify the correctness of theoretical analysis. The measured maximum conversion efficiency at rated power is 95.56%.
Keyword Function decoupling, High voltage gain, High efficiency, LLC resonant converter
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