Title: Self-adjustable Feed-forward Control and Auto-tracking Off-time Control Techniques for 95% Accuracy and 95% Efficiency AC-DC Non-isolated LED Driver
Authors: Chen, Hsin
Chen, Chi-Wei
Hsieh, Hsueh-Yi
Chen, Ke-Horng
Tsai, Tsung-Yen
Lin, Jian-Ru
Lin, Ying-Hsi
Lee, Chao-Cheng
Tseng, Pei-Ling
Institute of Electrical and Control Engineering
Keywords: non-isolated buck;self-adjusted feed-forward control (SAFFC);auto-tracking off-time control (ATOTC);peak current control (PCC);hysteresis current control (HCC)
Issue Date: 2015
Abstract: the non-isolated buck topology for LED driver is proposed to reduce volume and cost without the need of large transformer. Besides, in the entire universal range of AC input voltage, the proposed self-adjusted feed-forward control (SAFFC) technique ensures small variation in the LED current. The auto-tracking off-time control (ATOTC) technique is also adopted to adjust the off time to guarantee the current accuracy is better than that of the peak current control (PCC) technique while and the efficiency is better than that of the hysteresis current control (HCC) technique. Test chip fabricated in VIS 0.5 mu m 700V ultra-high voltage (UHV) process demonstrates power factor higher than 0.97, averaged 95% high accuracy, and 95% high efficiency.
URI: http://hdl.handle.net/11536/134757
ISBN: 978-1-4799-8391-9
ISSN: 0271-4302
Begin Page: 1746
End Page: 1749
Appears in Collections:Conferences Paper