Analysis and Design of Function Decoupling High Voltage Gain DC/DC Converter

Yuqi Wei; Quanming Luo; Xingyu Lv; Pengju Sun; Xiong Du

Analysis and Design of Function Decoupling High Voltage Gain DC/DC Converter

Vol. 19, No. 2, pp. 380-393, Mar. 2019

10.6113/JPE.2019.19.2.380

Function decoupling

High voltage gain

High efficiency

LLC resonant converter

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Abstract

Traditional boost converters have difficulty realizing high efficiency and high voltage gain conversion due to 1) extremely large duty cycles, 2) high voltage and current stresses on devices, and 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. The role of DCX is to realize fixed gain conversion with high efficiency, whereas the role of the auxiliary converter is to regulate the output voltage. In this study, different forms of combined high voltage gain converters are compared and analyzed, and a structure is selected for the function decoupling high voltage gain converter. Then, topologies and control strategies for the DCX and auxiliary converter are discussed. On the basis of the discussion, an optimal design method for circuit parameters is proposed, and design procedures for the DCX are described in detail. Finally, a 400 W experimental prototype based on the proposed optimal design method is built to verify the accuracy of the theoretical analysis. The measured maximum conversion efficiency at rated power is 95.56%.

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Cite this article

[IEEE Style]

Y. Wei, Q. Luo, X. Lv, P. Sun, X. Du, "Analysis and Design of Function Decoupling High Voltage Gain DC/DC Converter," Journal of Power Electronics, vol. 19, no. 2, pp. 380-393, 2019. DOI: 10.6113/JPE.2019.19.2.380.

[ACM Style]

Yuqi Wei, Quanming Luo, Xingyu Lv, Pengju Sun, and Xiong Du. 2019. Analysis and Design of Function Decoupling High Voltage Gain DC/DC Converter. Journal of Power Electronics, 19, 2, (2019), 380-393. DOI: 10.6113/JPE.2019.19.2.380.