Analysis and Design of DC-DC Converter with High Voltage Gain and Reduced Switch Stress

• Main Authors: Ming-Hsiu Tsai, 蔡明修
• Other Authors: Yie-Tone Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/64889866856167110230

碩士 === 國立雲林科技大學 === 電機工程系碩士班 === 101 === In this thesis, a novel high step-up dc-dc converter with high voltage gain and reduced switch stress is proposed. Utilizing the coupled inductor to replace the boost inductor for high step-up converter is widely used in the application of high voltage gain converter. It can not only achieve a high voltage gain but use the core effectively by using the coupled inductor. The techniques of voltage lift, voltage multiplier and clamp mode are also used in the proposed topology. Furthermore, the proposed converter can avoid the extreme duty cycle that will cause a lot of conduction losses. The leakage energy of the coupled inductor will cause a huge voltage on the components of circuit, so that it needs to choose the components with high voltage and current stresses. Then the efficiency is reduced and the cost is increased. Using the active-clamp circuit to recycle the leakage inductor energy will cause the increasing cost and make the circuit be complex. The converter proposed in this paper can not only recycle the leakage inductance energy to output but also increase the efficiency. A 300 W prototype converter which is implemented with an input voltage of 26 V and an output voltage up to 400 V will demonstrate the effectiveness of this proposed converter.