Flicker-free transformerless LED driving circuit based on quadratic buck PFC converter

Author

Tiesheng Yan ; Jianping Xu ; Xueshan Liu ; Guohua Zhou ; Jianlong Gao

Author_Institution

Sch. of Electr. Eng., Southwest Jiaotong Univ., Chengdu, China

Volume

50

Issue

25

fYear

2014

fDate

12 4 2014

Firstpage

1972

Lastpage

1974

Abstract

A flicker-free transformerless light emitting diode (LED) driving circuit based on a quadratic buck power factor correction (PFC) converter is proposed. It combines a cascaded input buck PFC converter and an output buck dc-dc converter with a single switch. The proposed LED driving circuit can not only achieve high PFC to comply with the EN61000-3-2 standard and low output voltage without a high step-down transformer, but also reduces second-order line frequency current ripple flowing through the LED to eliminate light flicker of the LED. Experimental results of a 7 W prototype are presented to verify the analysis results of the proposed converter.

Keywords

driver circuits; light emitting diodes; power convertors; power factor correction; EN61000-3-2 standard; flicker-free transformerless LED driving circuit; high step-down transformer; light emitting diode; output buck dc-dc converter; power 7 W; power factor correction converter; quadratic buck PFC converter; second-order line frequency current ripple;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2014.2454

Filename

6975689