A Study on Efficiency Enhancement for Two-Stage Power Supply Converters

• Main Authors: Lay-Chih Lee, 李壘志
• Other Authors: I-Hua Liu
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/43wcxm

碩士 === 國立臺灣科技大學 === 電機工程系 === 107 === In response to the tightness of power demand and global warming effect today, high power density and high efficiency power supplies have become the mainstream trend in power supply design. In order to achieve this goal, this thesis combines a boost-type power factor corrector (PFC) and a half-bridge LLC resonant converter to improve the efficiency of the AC to DC converter. This thesis develops a 240W output power supply. The overall architecture includes a front-end boost-type PFC with critical conduction mode (CRM) operation to improve the power factor of the ac line. The post stage utilizes a half-bridge LLC resonant converter to achieve high efficiency DC conversion. Experimental results show that the conversion efficiency of the overall system is higher than 87% at light load, higher than 92% at half load, and higher than 90% at full load. The average efficiency is increased by 0.5%, and the efficiency can be increased by more than 4% at light load. Therefore, the goal of improving efficiency is achieved.