Single-stage AC/DC single-inductor multiple-output LED drivers

Yue Guo, Sinan Li, Albert Ting Leung Lee, Siew-Chong Tan, Chi Kwan Lee, S.Y.Ron Hui

Research output: Contribution to journalArticlepeer-review

67 Citations (SciVal)


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.
Original languageEnglish
Pages (from-to)5837-5850
Number of pages14
JournalIEEE Transactions on Power Electronics
Issue number8
Early online date30 Oct 2015
Publication statusPublished - 1 Aug 2016


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