Title :
Novel Isolated High-Step-Up DC–DC Converter With Voltage Lift
Author :
Liang, Tsorng-Juu ; Lee, Jian-Hsieng ; Chen, Shih-Ming ; Chen, Jiann-Fuh ; Yang, Lung-Sheng
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
fDate :
4/1/2013 12:00:00 AM
Abstract :
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%.
Keywords :
DC-DC power convertors; capacitors; switches; transformers; active switches; boosting capacitors; clamping diodes; duty ratio; full-load efficiency; high voltage gain; isolated high-step-up DC-DC converter; leakage energy; power 200 W; secondary winding; transformer; two-switch high-step-up isolated converter; voltage 200 V; voltage 24 V; voltage lift technique; voltage spikes; Boosting; Capacitors; Clamps; Equivalent circuits; Inductance; Switches; Windings; High step-up; high voltage gain; two-switch isolated converter; voltage-lift technique;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2011.2177789