Study and Implementation of a Cascoded Half-Bridge Series Resonant Converter with Synchronous Rectification

• Main Authors: Jun-zhi Zhong, 鐘俊智
• Other Authors: Yu-kang Lo
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/90280109042394733517

碩士 === 國立臺灣科技大學 === 電子工程系 === 102 === This thesis presents a cascoded half-bridge series resonant converter with synchronous rectification. The Mathcad software is used to simulate the influences of the quality factor (Q), K factor, characteristics impedance (Zo), and the transformer turns-ratio (NP/NS) on the frequency response of voltage gain. The proposed converter has the advantage of low device stress. It subjects the off transistor on primary side to only half of the input voltage. The transformers can share the output current to reduce the copper losses. The conduction losses on the output synchronous rectifier can also be reduced to improve the conversion efficiency. Circuit analysis and design consideration of the proposed cascoded half-bridge series resonant converter with synchronous rectification are discussed in details. The prototype converter with an input voltage 380V, output voltage 12 V and the rated output current 54.4 A was implemented and tested. The efficiency can be higher than 93 % at 20 % load to full load conditions and the voltage regulation is less than 1 %.