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JPE, Vol. 19, No. 1, January 2019
Multi-Output LED Driver Integrated with 3-Switch Converter and Passive Current Balance for Portable Applications
Sen Song, Kai Ni, Guipeng Chen, Yihua Hu, and Dongsheng Yu
Area Low Power Converters
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%.
Keyword Multiple outputs,Passive current balance,Reduced switches,Zero-voltage-switching (ZVS)
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