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| An Electrolytic Capacitor-less LED Driver with High Input Power Factor and Constant Output Current |
| Chen Wu, Wang Guangjiang |
| Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment Southeast University Nanjing 210096 China |
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Abstract While light-emitting diodes(LED) enjoy relatively long lifetime up to 10 years, the lifetime of traditional LED drivers using electrolytic capacitor as storage element is limited typically less than 5 years. In this paper, an AC-DC LED driver without electrolytic capacitor is studied. Compared with other methods to eliminate electrolytic capacitor, the proposed driver has the advantages of almost unity input power factor and constant output current for LEDs. The operation principle, detailed design procedure of the main circuit and control strategy are presented. The feasibility of the proposed converter has been successfully verified by experimental results.
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Received: 17 September 2012
Published: 26 March 2014
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2013, Vol. 28 
