Off-line Flyback LED Driver with PWM Dimming and Power Factor Correction Employing a Single Switch

被引：0
|
作者：
Almeida, Pedro S. [1 ]
Soares, Guilherme M. [1 ]
Braga, Henrique A. C. [1 ]
机构：
[1] Fed Univ Juiz de Fora UFJF, Modern Lighting Res Grp NIMO, Juiz De Fora, MG, Brazil
来源：
2012 10TH IEEE/IAS INTERNATIONAL CONFERENCE ON INDUSTRY APPLICATIONS (INDUSCON) | 2012年
关键词：
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this work, an off-line flyback converter with PWM dimming function employing a single active power switch is proposed for LED lighting. The proposed converter is a slightly modified flyback topology which enables the main switch to be used both for power factor correction and PWM high-frequency dimming with a constant peak current on the LEDs, in order to conserve chromatic characteristics of the light emitted. The proposed control scheme uses duty-cycle to control the dimming level, while switching frequency is varied along to adjust the input power level and maintain a constant peak current on the LEDs. Mathematical description, simulation and experimental results of a prototype with 100 W of peak power fed from 127 V mains voltage are presented in this paper to show feasibility of the single-stage converter proposal.
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页数：7
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