Implementation of a Digitally Controlled LLC Resonant Converter with Synchronous Rectifiers

• Main Authors: Kuo-liang Huang, 黃國樑
• Other Authors: Yi-Hua Liu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/43114541349356000496

碩士 === 國立臺灣科技大學 === 電機工程系 === 100 === Due to the introduction of new regulations concerning more efficient use of energy and the present industry trends that demand smaller size, thinner profile and improved thermal management, improving power supply efficiency is essential. Higher efficiency, higher power density, and higher component density have become common in power supply designs and their applications.　LLC resonant converters are becoming increasingly popular in switched mode power supply design due to its high efficiency, low level of EMI emissions, and its ability to achieve high power density. On the other hand, digital power can provide intelligent adaptability and flexibility to satisfy any complex power requirement with the straightforward ability to monitor, process and adapt to system conditions. In this thesis, the design of a digitally-controlled LLC resonant converter is presented. The LLC resonant topology allows for zero voltage switching of the main switches, thereby dramatically lowering switching losses and boosting efficiency. A digital signal controller dsPIC33FJ16GS502 from Microchip corp. is utilized as the digital controller of the LLC resonant converter. In order to further improve the efficiency of the presented LLC resonant converter, synchronous rectification is also implemented. Detailed description about the hardware and firmware parts of the proposed system will be presented first and the design considerations will be discussed. Finally, experimental results will be presented to validate the correctness of the proposed system.