DocumentCode :
1468088
Title :
A Novel Output Current Estimation and Regulation Circuit for Primary Side Controlled High Power Factor Single-Stage Flyback LED Driver
Author :
Xie, Xiaogao ; Wang, Jian ; Zhao, Chen ; Lu, Qiang ; Liu, Shirong
Author_Institution :
Coll. of Autom., Hangzhou Dianzi Univ., Hangzhou, China
Volume :
27
Issue :
11
fYear :
2012
Firstpage :
4602
Lastpage :
4612
Abstract :
A novel output current estimation and regulation circuit for the primary side controlled high power factor (PF) single-stage flyback LED is proposed in this paper. The proposed output current estimation and regulation circuit is composed of a novel output current estimation circuit and a negative feedback networks. The output current estimation circuit can estimate the output current in the primary side and then achieve output current regulation through negative feedback. The proposed output current estimation and regulation circuit is suitable for discontinuous conduction mode (DCM) and boundary conduction mode (BCM). The output of the proposed output current estimation and regulation circuit is a half-sine waveform and followed by the primary current, hence high PF can be achieved. Detailed theoretical analysis and design considerations were presented. Two 340 mA/25 V laboratory LED driver prototypes operating in DCM and BCM were built up. The experimental results verified theoretical analyses.
Keywords :
driver circuits; electric current control; light emitting diodes; power factor; boundary conduction mode; controlled high power factor; current 340 mA; discontinuous conduction mode; half-sine waveform; negative feedback networks; output current estimation; primary current; primary side; regulation circuit; single-stage flyback LED driver; voltage 25 V; Current control; Equations; Estimation; Light emitting diodes; Mathematical model; Reactive power; Switches; Constant output current; LED driver; power factor corrector (PFC); primary side controlled;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2012.2190523
Filename :
6168277
Link To Document :
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