Design and Implementation of a Dimmable LED Driver with Half-bridge LLC Resonant Converter

• Main Authors: Jia-HongChen, 陳佳鴻
• Other Authors: Tsrong-Jun Liang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/68670695458781864315

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 100 === In this thesis, the design and implementation of a dimmable LED driver with half-bridge LLC resonant converter is presented. The front-stage of the proposed topology is a boost power factor correction circuit and the rear-stage is a half-bridge LLC resonant circuit. To make the PFC circuit operated in continuous conduction mode, a average current controller is used. The half-bridge LLC resonant converter enables the MOSFETs to operate at zero voltage switching and output diode to achieve zero current switching. The voltage gain and operating principle of the half-bridge LLC resonant are presented. In addition, the pulse width modulation dimming function is discussed. Finally, a half-bridge LLC resonant LED driver is implemented with input voltage 90~264 Vrms, 150 W LED module in the laboratory. Experimental results show that the power factor is over 0.98 and the maximum efficiency is up to 90.8%.