A New High-Gain, High-Efficiency SEPIC-Based DC-DC Converter for Renewable Energy Applications

• Published in: IEEE journal of emerging and selected topics in industrial electronics (Print) Vol. 2; no. 4; pp. 567 - 578
• Main Authors: Hasanpour, Sara, Forouzesh, Mojtaba, Siwakoti, Yam, Blaabjerg, Frede
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Capacitors; Circuits; Clamps; Conversion ratio; Converters; coupled-inductor; DC-DC power converters; Efficiency; Energy dissipation; High gain; High-voltage techniques; Inductance; Inductors; Leakage; quasi-resonance; Step-up dc–dc converter; Switches; Switching; Topology; Voltage gain; Zero current switching
• ISSN: 2687-9735; 2687-9743
• DOI: 10.1109/JESTIE.2021.3074864

This article proposes a new configuration of quasi-resonant high-gain high-efficiency single-ended primary inductor converter (QRHGHE-SEPIC)-based dc-dc converter with continuous input current. The presented single-switch topology uses a coupled-inductor (CI), a voltage multiplier integrated with a regenerative passive lossless clamp circuit to enhance the voltage conversion ratio. In the proposed converter, the main power switch turns on at zero current switching. Moreover, by adopting a quasi-resonance (QR) operation between the leakage inductor of the CI and the middle capacitors, the current value of the main switch at turn- off moment is alleviated. In addition, the leakage inductance slows down the turn- off slope of all diodes and hence there is no reverse recovery problem in the proposed converter. Due to soft-switching operation in all switching components, the power dissipations in the converter are significantly alleviated. Thus, the proposed QRHGHE-SEPIC can provide high voltage gain while achieving a high efficiency. Steady-state analysis, comprehensive comparisons with other related converters, and design considerations are discussed in detail. Finally, to verify the validity of the theoretical analysis, a 160 W/200 V sample prototype is demonstrated at the switching frequency of 60 kHz and with voltage gain of 10.