Improvement in Voltage Conversion Ratio of Ultrahigh Step-Down Converter

Kuo-Ing Hwu, Wen-Zhuang Jiang and Hsiang-Hao Tu
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Kuo-Ing Hwu: Department of Electrical Engineering, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd. Taipei 10608, Taiwan
Wen-Zhuang Jiang: Chicony Power Technology Co., Ltd., Sanchong, New Taipei 21458, Taiwan
Hsiang-Hao Tu: Delta Electronics Inc., Neihu, Taipei 11466, Taiwan

Energies, 2019, vol. 12, issue 20, 1-18

Abstract: A modified step-down converter is presented herein, which is mainly based on one coupled inductor and several energy-transferring capacitors to improve the voltage conversion ratio as well as to reduce the switch voltage stress. In addition, the portion of the leakage inductance energy can be recycled to the input via the active clamp circuit during the turn-off period and the switches have zero-voltage switching (ZVS) during the turn-on transient. In this paper, the basic operating principles of the proposed converter are firstly described and analyzed, and its effectiveness is finally demonstrated by experiment based on a prototype with input voltage of 60 V, output voltage of 3.3 V and rated output power of 33 W.

Keywords: active clamp circuit; coupled inductor; ultrahigh step-down converter; field-programmable gate array; zero-voltage switching; voltage conversion ratio (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: 2019
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