A Novel High Efficiency Quasi-Resonant Converter

Tianyu Zhu, Jianze Wang, Yanchao Ji and Yiqi Liu
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Tianyu Zhu: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Jianze Wang: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Yanchao Ji: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Yiqi Liu: School of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China

Energies, 2018, vol. 11, issue 8, 1-14

Abstract: In this paper, a new constant-frequency quasi-resonant converter is proposed. Compared with the traditional LLC converter, the proposed converter can effectively reduce the range of the operating frequency. The output voltage is changed to adjust the reactance of the resonant cavity. The proposed converter has a better loss factor. To verify the theoretical analysis and soft-switching condition, a 250 W, 100 V output prototype was built and compared with the full-bridge LLC converter. Analysis and experimental results verify that a smaller operating frequency range and volume of the transformers, a soft-switching condition, and a higher overall efficiency are achieved with the proposed converter.

Keywords: constant frequency; quasi-resonant; switch-control-capacitor (SCC); zero voltage switching (ZVS); zero current switching (ZCS); smaller volume; higher overall efficiency (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: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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