Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Highly extendable multi-channel LED driver with leakage energy recycling

  • Kong, Xianghong (School of Automation Science and Engineering, South China University of Technology) ;
  • Liu, Junfeng (School of Automation Science and Engineering, South China University of Technology) ;
  • Zeng, Jun (School of Electric Power, South China University of Technology)
  • Received : 2021.06.30
  • Accepted : 2022.03.14
  • Published : 2022.07.20
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Abstract

This paper presents a single-stage single-switch multi-channel LED driver with high extendibility. The PFC module adopts a buck-boost circuit, which can achieve a high-power factor when it works in the discontinuous current mode (DCM). At the same time, the leakage inductor energy can be recycled by adding a capacitor at the primary side to reduce the voltage spike and ringing of the switch. The DC-DC module adopts a forward converter that plays the role of electrical isolation. Using capacitor charge balance, the converter can achieve output current balancing of all the channels. This converter can extend the number of output channels while using fewer capacitors than traditional LED drivers based on capacitor charge balance. In addition, the PFC module is integrated with the DC-DC module while sharing a common switch, which makes the control simple. This paper provides the concrete structure, working principle, and circuit characteristic analysis of the proposed topology. Finally, a 100 W prototype was built to verify its feasibility.

Keywords

Acknowledgement

The authors gratefully acknowledge the financial support of National Natural Science Foundation of China (No. 62173148 and 51877085)

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