A Coupled-Inductor Interleaved LLC Resonant Converter for Wide Operation Range

Qianfan Zhou, Yang Liu, Zongjian Li and Zhixing He
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Qianfan Zhou: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yang Liu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Zongjian Li: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Zhixing He: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Energies, 2022, vol. 15, issue 1, 1-21

Abstract: In this paper, a coupled-inductor interleaved LLC resonant converter (CI-ILLC) was proposed, which can achieve extensive operation range applications by multiplexing inductors and switches. In this proposed CI-ILLC, the coupled-inductor not only serves as a filter inductor but also plays the role of transformer to improve the power density. By changing the modulation methods, the proposed converter can work at three modes for a wide operation range, namely high gain (HG) mode, medium gain (MG) mode, and low gain (LG) mode. Moreover, the interleaved structure greatly reduces the current ripple and current stress of switches. Besides, in HG and MG modes, all switches can realize zero-voltage switching, with high energy transmission efficiency. Finally, the simulation and experiment results of the prototype with 120–200 V input and 50–200 V output are presented to verify the viability of the proposed converter.

Keywords: interleaved; coupled-inductor; LLC resonant; fixed-frequency PWM; wide operation range (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: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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