Department of Electrical Engineering, National Cheng Kung University, No. 1 University Road, Tainan 701, Taiwan
Power Supply Group, National Synchrotron Radiation Research Center, 101, Hsin-Ann Rd., Hsinchu 300, Taiwan
: Received: 18 October 2016 / Approved: 18 October 2016 / Online: 18 October 2016 (09:45:49 CEST)
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How to cite:
Wong, Y.; Chen, J.; Liu, K. Novel Step-up DC-to-DC Converter with Isolated Transformer and Switched-Clamp Capacitor Techniques for Renewable Systems. Preprints2016, 2016100074 (doi: 10.20944/preprints201610.0074.v1).
Wong, Y.; Chen, J.; Liu, K. Novel Step-up DC-to-DC Converter with Isolated Transformer and Switched-Clamp Capacitor Techniques for Renewable Systems. Preprints 2016, 2016100074 (doi: 10.20944/preprints201610.0074.v1).
A high step-up DC-to-DC converter that integrates an isolated transformer and a switched-clamp capacitor is presented in this study. The voltage stress of the main power switch should be clamped to 1/4 V by using the turn ratio and switched-clamp capacitor of an isolated transformer to achieve a high voltage gain. In addition, a passive clamp circuit is employed reduce voltage stress on the main power switch. The energy of the leakage inductor can be recycled by the clamp capacitor because of the passive clamp circuit, thereby improving the power converter efficiency. The converter consists of one isolated transformer, one main switch, three capacitors, and four diodes. Operating principle and steady-state analyses are also discussed. Finally, a 24-V-input voltage to 200-V-output voltage and a 150 W output power prototype converter are fabricated in the laboratory. The maximum efficiency of the converter is 95.1 at 60 W.
high voltage gain; switch-clamp capacitor; DC–DC converter; renewable energy