Filter Capacitor Minimization in a Flyback LED Driver Considering Input Current Harmonics and Light Flicker Characteristics

Author

Shagerdmootaab, Ali ; Moallem, Mehrdad

Author_Institution

Sch. of Mechatron. Syst. Eng., Simon Fraser Univ., Burnaby, BC, Canada

Volume

30

Issue

8

fYear

2015

fDate

Aug. 2015

Firstpage

4467

Lastpage

4476

Abstract

In this paper, a comprehensive study is conducted on reducing the size of output filter capacitor in an ac-dc flyback converter for driving high-brightness LED strings. To this end, a relationship between the input current harmonics, LED light flicker, and the magnitude of filter capacitor is obtained. It is shown that the size of the filter capacitor is mostly affected by the amplitude of the third and fifth harmonics of input current and the output light flicker. Considering the EN61000-3-2 standard for input current harmonics content and ENERGY STAR standard for flicker requirement, a procedure for obtaining the minimum value of filter capacitance is presented. Experimental studies are performed on an ac-dc flyback LED driver using the proposed method and tested on Cree XLamp XP-G and CR22-32L LED strings.

Keywords

AC-DC power convertors; capacitors; driver circuits; flicker noise; light emitting diodes; minimisation; ac-dc flyback converter; filter capacitor minimization; flyback LED driver; high-brightness LED strings; input current harmonics; light flicker characteristics; output filter capacitor; Capacitance; Capacitors; Harmonic analysis; Light emitting diodes; Power harmonic filters; Standards; Flyback converter; harmonic current injection; light-emitting diode (LED); output light flicker;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2014.2357333

Filename

6898835