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

作者：Hu Jiajun^*; Chen Houpeng; Li Xi; Wang Qian; Jin Rong; Zhang Yiyun; Song Zhitang

来源：IEICE Electronics Express, 2014, 11(24): 20141011.

DOI：10.1587/elex.11.20141011

• ZCD
• LED driver
• PFC
• BCM

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.

• 出版日期2014
• 单位信息功能材料国家重点实验室; 中国科学院上海微系统与信息技术研究所