Design of the High Efficiency LLC Power Converter

• Main Authors: Chi-Tsung Liang, 梁繼宗
• Other Authors: Wein-So Wang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/pxv2jj

碩士 === 崑山科技大學 === 電子工程研究所 === 96 === This thesis presents an output-current ripple reduction method for LLC resonant converter. Based on soft-switching, high efficiency and low electromagnetic interference, LLC resonant converter has been widely used for high switching frequency power conversion applications. However, the high output ripple current is the main drawback. Besides, for the large output current ripple of LLC resonant converter, the large output capacitance is necessary to reduce output current ripple for the high quality DC output voltage. In order to solve this problem, a current shaping technique is presented in this thesis. By using the resonant tank with a parallel passive network, the output ripple current can be improved. Also, the values of the output capacitance can be reduced. Finally, a 400V input voltage, 24V/8A output prototype of LLC resonant converter has been simulated and implemented. The simulation and experimental results demonstrated the feasibility of proposed method.