A novel auxiliary-free zero inductor current detection scheme for step down non-isolated LED driver

Hu Jiajun; Chen Houpeng; Li Xi; Wang Qian; Jin Rong; Zhang Yiyun; Song Zhitang

doi:10.1587/elex.11.20141011

LETTER

A novel auxiliary-free zero inductor current detection scheme for step down non-isolated LED driver

Hu Jiajun, Chen Houpeng, Li Xi, Wang Qian, Jin Rong, Zhang Yiyun, Song Zhitang

Author information

Hu Jiajun
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences
Chen Houpeng
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences
Li Xi
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences
Wang Qian
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences
Jin Rong
Shanghai Key Laboratory of Nanofabrication Technology for Memory, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences
Zhang Yiyun
Shanghai Key Laboratory of Nanofabrication Technology for Memory, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences
Song Zhitang
Shanghai Key Laboratory of Nanofabrication Technology for Memory, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences

Keywords: ZCD, LED driver, PFC, BCM

JOURNAL FREE ACCESS

2014 Volume 11 Issue 24 Pages 20141011

DOI https://doi.org/10.1587/elex.11.20141011

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Details

Abstract

A novel auxiliary-free zero crossing detection (ZCD) circuit is presented in this paper, which is especially suitable for step down non-isolated LED drivers operating in boundary conduction mode (BCM). Without extra auxiliary winding, the proposed method can fast and correctly detect zero inductor current information, which only requires an integrated NMOS power switch. The step down non-isolated LED driver with the proposed ZCD scheme has been implemented in CZ6H 0.35 um standard CMOS process, results show that the proposed ZCD scheme can always work properly regardless of the variation of line voltage and load condition.

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