Details

Autor(en) / Beteiligte

• Yue Guo
• Sinan Li
• Lee, Albert T. L.
• Siew-Chong Tan
• Chi Kwan Lee
• Hui, S. Y. R.

Titel

Single-Stage AC/DC Single-Inductor Multiple-Output LED Drivers

Ist Teil von

• IEEE transactions on power electronics, 2016-08, Vol.31 (8), p.5837-5850

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2016

Quelle

IEEE Explore

Beschreibungen/Notizen

• Various ac/dc LED driver topologies have been proposed to meet the challenges of achieving a compact, efficient, low-cost, and robust multistring LED lighting system. These LED drivers typically employ a two-stage topology to realize the functions of ac/dc rectification and independent current control of each LED string. The choice of having two stage conversions involves additional hardware components and a more complicated controller design process. Such two-stage topologies suffer from a higher system cost, increased power loss, and large form factor. In this paper, a single-stage ac/dc single-inductor multiple-output LED driver is proposed. It uses only one single inductor and N + 1 active power switches (N being the number of LED strings) with reduced component count and smaller form factor. The proposed driver can achieve both functions of ac/dc rectification with a high power factor and precise independent current control of each individual LED string simultaneously. A prototype of an ac/dc single-inductor triple-output LED driver is constructed for verification. Experimental results corroborate that precise and independent current regulation of each individual LED string is achievable with the proposed driver. A power factor of above 0.99 and a peak efficiency of 89% at 30-W rated output power are attainable.