Design and Implementation of Three-Winding Coupled Inductor Applied in High Step-Up DC/DC Converter Combined with Voltage Multipliers

Jiuxu Song, Jiahao Wang, Yuanzhong Qin, Shuai Ding and Bing Ji ()
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Jiuxu Song: School of Electronic Engineering, Xi’an Shiyou University, Xi’an 710065, China
Jiahao Wang: School of Electronic Engineering, Xi’an Shiyou University, Xi’an 710065, China
Yuanzhong Qin: Department of Mobile Equipment, Fushun Petrochemical Company, Fushun 113000, China
Shuai Ding: School of Engineering, University of Leicester, Leicester LE1 7RH, UK
Bing Ji: School of Engineering, University of Leicester, Leicester LE1 7RH, UK

Energies, 2025, vol. 18, issue 8, 1-22

Abstract: By combining a coupled inductor with voltage multipliers, the voltage gain of a boost converter can be improved significantly. This method has good application prospects in renewable energy generation and in DC microgrids. A coupled inductor is the core component of the high step-up DC/DC converter and has serious impact on its performance. However, shortage in the methods used to design the coupled inductor have limited the applications of such converters. By analyzing the operating modes of the high step-up DC/DC converter with a three-winding coupled inductor combined with two voltage multipliers, accurate and simplified models of currents in the three windings are established. Furthermore, a design methodology for a multi-winding coupled inductor is put forward, in which a method of calculating the boost inductance and product areas (AP) and a method for selecting the magnetic core are established. The influence of winding arrangements and loss evaluations of the coupled inductor are also investigated. Finally, a 200 W prototype converter with an input of 20 V and output of 200 V is prepared and tested. The correctness of the current models of and design methods used on coupled inductor are verified. More important, the method proposed to design multi-winding coupled inductors can be applied to design high step-up DC/DC converters with different topologies.

Keywords: high step-up DC/DC converter; multi-winding inductor; current model; design method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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