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http://dx.doi.org/10.6113/JPE.2019.19.1.58

Multi-Output LED Driver Integrated with 3-Switch Converter and Passive Current Balance for Portable Applications  

Song, Sen (Department of Electrical Engineering and Electronics, University of Liverpool)
Ni, Kai (Department of Electrical Engineering and Electronics, University of Liverpool)
Chen, Guipeng (School of Aerospace Engineering, Xiamen University)
Hu, Yihua (Department of Electrical Engineering and Electronics, University of Liverpool)
Yu, Dongsheng (School of Electrical and Power Engineering, China University of Mining and Technology)
Publication Information
Journal of Power Electronics / v.19, no.1, 2019 , pp. 58-67 More about this Journal
Abstract
This study presents a new portable eight-output light emitting diode (LED) driver. The eight output-channels are divided into two equal groups, and their output powers can be controlled individually by three active switches. In addition, a simple capacitor-based passive current balancing circuit (CBC) is employed in each port to guarantee that the currents of the four LEDs are the same. When compared with the conventionally used separate two-output isolated converters, the proposed one uses one less active switch. Moreover, zero-voltage-switching (ZVS) is achieved, which improves the power efficiency of the driver. Finally, a highly compact prototype is built, which can reach an efficiency of 94.6%.
Keywords
Multiple outputs; Passive current balance; Reduced switches; Zero-voltage-switching (ZVS);
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