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Novel Isolated High-Step-Up DC–DC Converter With Voltage Lift

2011; Institute of Electrical and Electronics Engineers; Volume: 60; Issue: 4 Linguagem: Inglês

10.1109/tie.2011.2177789

1557-9948

Tsorng‐Juu Liang, Jian-Hsieng Lee, Shih‐Ming Chen, Jiann-Fuh Chen, Lung-Sheng Yang,

Advanced Battery Technologies Research

A novel two-switch high-step-up isolated converter with voltage lift is proposed in this paper. The proposed isolated converter utilizes a transformer with low turn ratio to achieve high step-up gain. The secondary winding charges two boosting capacitors in parallel as switches during the switch-on period, and two boosting capacitors are discharged in series during the switch-off period. Thus, the converter has high voltage gain with appropriate duty ratio. In addition, by using two clamping diodes and a capacitor on the primary side, leakage energy is recycled, and the voltage spikes of the two active switches are clamped, thereby improving conversion efficiency. Finally, experimental results based on a prototype implemented in the laboratory with an input voltage of 24 V, an output voltage of 200 V, and an output power of 200 W verify the performance of the proposed isolated converter; full-load efficiency is nearly 93%.