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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
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  3. JIEIE 2013-05(Vol.27 No.05)
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Title The Reduction Method of Strings Current Unbalancing in LED Lighting Driving System
Authors Chong-Yeun Park ; Jae-Wook Song ; Jin-Wan Yoo
DOI http://dx.doi.org/10.5207/JIEIE.2013.27.5.026
Page pp.26-32
ISSN 1225-1135
Keywords LED Strings Currents Unbalance ; LED Driving Circuit ; DSP ; Balancing Transformer
Abstract The LED has the proportional characteristic between the flux of light and its current and has caused voltage-current deviation on production process. Thus the unbalancing of each LED strings current occurred by its characteristic deviation. This unbalancing reduce a uniformity of the flux of light. Therefore, we researched to design method the LED driver based on DSP and the balancing transformer for a LED current balancing. These are applied to 50W LED module consist of 4 parallel strings. We analyzed the reduction of LED currents unbalance by experimental result from each method.