Implementation and Study of High Step-up Power Converter by Coupled Inductor and Voltage-lift Technique

• Main Authors: Yu-Jen Tien, 田佑仁
• Other Authors: Hsiau-Hsian Nien
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/86838492223837519471

碩士 === 建國科技大學 === 電機工程系暨研究所 === 99 === Abstract This thesis presents a high step-up ratio power converter with coupled inductors and voltage-lift technique. By adjusting the turns ratio of coupled inductors and utilizing voltage-lift technique and voltage double circuits, high voltage gain ratio is achieved. Furthermore, the energy of the leakage inductor of coupled inductors can be recycled during switching off period, effective voltage clamping on the power switch can be achieved, and therefore enhances the power conversion efficiency. The steady state operation of the proposed converter is first analyzed; and, the voltage gain of the converter is further deduced. Finally, the high step-up ratio power converter with the combination of coupled inductors and voltage-lift technique is completed and experimental results prove the characteristics of high voltage gain ratio, high efficiency conversion and low voltage stress of power switches. The maximum efficiency of the circuit presents 99.0% and the full load efficiency reaches 90.1% that it is considered suitable for the applications of converting low voltage into high voltage.