Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (11): 101-106,112.

• Power & Electrical Engineering • Previous Articles     Next Articles

LED Buck Power Supply with Active Ripple Compensation in Peak Current Control Mode

Tang Zhi-de  Zhang Xiao-bin  Wang Guan-tao  Xie Xiao-hui   

  1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology,Chongqing University,Chongqing 400030,China
  • Received:2011-12-16 Revised:2012-08-30 Online:2012-11-25 Published:2012-10-01
  • Contact: 唐治德(1958-) ，男，教授，主要从事大功率LED 照明、X 光机高压电源等研究． E-mail:xiaobin_86@126.com
  • About author:唐治德(1958-) ，男，教授，主要从事大功率LED 照明、X 光机高压电源等研究．
  • Supported by:

    国家自然科学基金资助项目( 50877082) ; 重庆大学输配电装备及系统安全与新技术国家重点实验室研究项目( 2007DA10512709303)

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Abstract:

In order to overcome the mismatching of the short lifespan of electrolytic capacitor in power supply to the long lifespan of high-power LED,an active ripple compensation circuit was proposed as the replacement of the traditional electrolytic capacitor filter. In the investigation,first,a Buck converter with slope compensation in peak current control mode was chosen as the main circuit and the corresponding current-loop transfer function was established. Next,the current loop stability with different slope compensations was discussed by analyzing the amplitudefrequency and the phase-frequency responses. Then,a prototype circuit of the LED Buck power supply with active ripple compensation in peak current control mode was designed. Finally,simulations and experiments were carried out to verify the correctness and reliability of the proposed circuit topology.

Key words: LED lighting, active ripple compensation, peak current control mode, harmonic oscillation, slope compensation

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