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  5. Asymmetric PWM Controlled LLCC Resonant Half Bridge Dual Outputs LED Driver

Asymmetric PWM Controlled LLCC Resonant Half Bridge Dual Outputs LED Driver

来源 :第十二届中国国际半导体照明论坛 | 被引量 : 0次 | 上传用户：sunfeaml
【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 D
【作 者】
：
Xinke Wu Chen Hu Guichao Hua 
【机 构】
：
College of Electrical Engineering;(Hangzhou)Zhejiang University Hangzhou 310027,China
【出 处】
：
第十二届中国国际半导体照明论坛
【发表日期】
：
2015年5期
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　　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.
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