Isolated Bidirectional Full-Bridge DC–DC Converter with a Flyback Snubber
Chitanya1, K.Sowjanya2, P.Raghavendran3

1Chitanya, EEE, JNTUH, CMR , Hyderabad, India.
2K.Sowjanya, EEE, JNTUH, CMR, Hyderabad, India.
3P.Raghavendran, EEE, JNTUH, CMR, Hyderabad, India.
Manuscript received on April 05, 2013. | Revised Manuscript received on April 28, 2013. | Manuscript published on May 05, 2013. | PP: 366-370 | Volume-3, Issue-2, May 2013. | Retrieval Number: B1565053213/2013©BEIESP
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Abstract: An isolated bidirectional full-bridge dc–dc converter with high conversion ratio, high output power, and soft start-up capability is proposed in this paper. The use of a capacitor, a diode, and a flyback converter can clamp the voltage spike caused by the current difference between the current-fed inductor and leakage inductance of the isolation transformer, and can reduce the current flowing through the active switches at the current-fed side. Operational principle of the proposed converter is first described, and then, the design equation is derived. A 1.5- kW prototype with low-side voltage of 48 V and high-side voltage of 360 V has been implemented, from which experimental results have verified its feasibility.
Keywords: Fly backconverter, isolated full- bridge bidirectional converter, soft start-up.