Analysis and Implementation of Soft-Switching Step up Converter

• Main Authors: Yu-siang Huang, 黃鈺翔
• Other Authors: Bor-ren Lin
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/62516805069059771709

碩士 === 雲林科技大學 === 電機工程系碩士班 === 97 === An active-clamp dual series-resonant step up converter is proposed in this thesis. By using the same topology, both a ZVZCS (zero-voltage zero-current switching) converter and another ZVS (zero-voltage switching) converter can be implemented. Two small transformers are used at the proposed topology to instead of a large transformer, which are much cost effective. An active-clamp circuit is used to absorb the energy stored in the leakage inductor of transformer, clamp voltage stresses across switches, and realize the ZVS turn-on of switches to alleviate the switching losses. The ZVZCS converter not only achieves the ZVS turn-on, but also carries out the ZCS (zero-current switching) turn-off to remove the reverse-recovery problem on output diodes due to choosing the angle frequency on the secondary side properly. The output power of the ZVS converter is much larger than the ZVZCS converter. Analysis of mode operation, design considerations and experimental results of each converter are described in detail. Also, the restriction of the ZVZCS converter is discussed in the section Ⅴ of this thesis. Finally, a 200W ZVZCS prototype and a 600W ZVS prototype are implemented to verify the practicability of the proposed converter.