| Title |
A Study on LED Driver Compatible with Triac-dimmer Employing Active Bleeder |
| Authors |
Bong-Ho Yeom ; Sung-Soo Hong ; Taek-Woo Kim |
| DOI |
10.6113/TKPE/2014.19.4.297 |
| Keywords |
valley-fill; active bleeder; TRIAC-dimmer; TRIAC-dimmable LED dirver |
| Abstract |
In this paper, a LED driver compatible with TRIAC-dimmer applying active bleeder is proposed. If TRIAC-dimmer is connected with LED driver, flicker phenomenon occurs by TRIAC malfunction. In order to prevent this problem, a current over holding current must flow into TRIAC. Therefore, additional circuit compatible with TRIAC-dimmer is required to provide enough current. Passive bleeder has power loss in whole operation period. The proposed circuit apply a valley-fill circuit for power-factor-correction and a novel active bleeder detecting malfunction point of TRIAC. Therefore, it prevent malfunction of TRIAC-dimmer and have advantage of higher efficiency than passive bleeder. To verify the validity of proposed circuit, 13W-lighting LED driver prototype has been proposed. |