A Two-Stage Quasi-Resonant Dual-Buck LED Driver With Digital Control Method
- 19 October 2017
- journal article
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Industry Applications
- Vol. 54 (1), 787-795
- https://doi.org/10.1109/tia.2017.2764875
Abstract
A two-stage quasi-resonant LED driver with a digital control method is proposed in this paper. The first stage of this converter is a boost circuit with a power factor correction (PFC) function, and the second stage is a dual buck circuit that works in a quasi-resonant zero voltage switching (ZVS) state. Because of the soft switching characteristics of the converter, switching losses are reduced and efficiency is significantly improved. A digital control method is adopted to detect the peak value of inductor current and enhance system reliability. Moreover, because LEDs are always driven by a current source, a current loop is designed to maintain constant output current. IRS2104 is chosen as the drive chip and the microcontroller is AT90PWM216, which can improve the quality of the drive signals. The output of the converter is a square wave that drives two branches of antiparallel LEDs. A 60-W prototype was designed to demonstrate the theoretical analysis. The obtained power factor was as high as 0.987, and efficiency reached 92.3%.Keywords
Funding Information
- Lite-On Power Electronics Technology Research Fund
- National Natural Science Foundation of China (51407044)
- Fundamental Research Funds for the Central Universities (HIT.BRETIII.201510)
- Research and Development of Applied Technology Projects in Heilongjiang Province (GA13A403)
- China Postdoctoral Science Foundation (2014M550187, 2015T80348)
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