Asymmetric PWM Controlled LLCC Resonant Half Bridge Dual Outputs LED Driver

摘要：

　　An asymmetric PWM controlled LLCC LED driver with capacitor connected in series with secondary winding of the transformer is proposed.Due to the presence of the secondary side resonant capacitor,the DC bias of the magnetizing current can be eliminated when asymmetric PWM control is employed.Because the switching frequency is fixed regardless of the load variation,the efficiency of light load is improved compared to conventional frequency controlled LLC topology,especially in dimming applications.The operating principle and circuit simplification of the secondary side circuit are presented.A two outputs LED driver prototype with 100V-200V output,0.035A-0.35A/channel is built up to verify the theoretical analysis.

作者: Xinke Wu Chen Hu Guichao Hua

作者单位: College of Electrical Engineering;(Hangzhou)Zhejiang University Hangzhou 310027,China Inventronics Hangzhou,310027,China

会议类型: 国内会议

会议名称: 第十二届中国国际半导体照明论坛

会议地点: 深圳

会议语种:英文

页码: 1-8

在线出版日期: 2015-11-02（万方平台首次上网日期，不代表论文的发表时间）