Study of a Buck-Fed LLC Series Resonant Converter with Synchronous Rectification

• Main Authors: Chien-tsung Yen, 顏建宗
• Other Authors: Yu-Kang Lo
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/15441722716870607906

碩士 === 國立臺灣科技大學 === 電子工程系 === 100 === This thesis aims to study and implement a two-stage buck-fed LLC series resonant converter with synchronous rectification. The first-stage buck converter is used to transfer DC voltage from 380V to 300V. The LLC series resonant converter with synchronous rectification supplies a 12V output voltage to the load. The LLC is operated at a fixed frequency with zero-voltage-switching and near to zero-current-switching features to achieve high efficiency performance. The output voltage is regulated by the pre-stage buck converter. The operating principles and design considerations are analyzed and discussed in details. A 350W prototype was designed and implemented. The experimental results are adown to verify the feasibility of the proposed scheme.