Isolated High Step-Up DC-DC Converter with Zero-Voltage-Switching

Abstract:

A high step-up DC-DCconverter is proposed in this paper. The proposed converter has two transformers.The primary sides of them are paralleled virtually and the secondary sides haveseries connection to increase the voltage gain. An active clamp circuit isemployed to suppress the switch voltage stresses and obtainzero-voltage-switching (ZVS) operation of the switches. Voltage doubler isselected as an output rectifier to increase the voltage gain and confine thevoltage across the output diodes to the output voltage. Since the output diodecurrents are controlled by the total leakage inductance of the transformers,the reverse-recovery problem of the output diodes is significantly alleviated.Due to the ZVS operation and the alleviated reverse-recovery problem, theswitching losses of the proposed converter are significantly reduced and theefficiency is improved. Steady-state analysis is performed. Experimentalresults based on a prototype are also provided to verify the effectiveness andfeasibility of the proposed converter.

• Periodical: Applied Mechanics and Materials (Volumes 313-314)
• Pages: 333-336
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.313-314.333
• Online since: March 2013
• Authors: Hyun Lark Do
• Keywords: Dc-Dc Converter, High Step-Up, Zero Voltage Switching (ZVS), Zero-Current-Switching

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