|تعداد مشاهده مقاله||3,514,459|
|تعداد دریافت فایل اصل مقاله||2,327,114|
An Isolated Off-Line High Power Factor Electrolytic Capacitor-Less LED Driver with Pulsating Output Current
|Journal of Operation and Automation in Power Engineering|
|مقاله 12، دوره 7، شماره 1، مرداد 2019، صفحه 129-139 اصل مقاله (1.27 M)|
|نوع مقاله: Research paper|
|شناسه دیجیتال (DOI): 10.22098/joape.2019.5391.1404|
|A. Ghaemi؛ M. R. Banaei* ؛ A. Safari|
|Department of Electrical Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran|
|One of the most efficient lighting technology is based on light-emitting diodes (LEDs). Common LED drivers with AC-input (50-60Hz) usually require a bulk electrolytic capacitor to decrease low-frequency ripple in the output. However, the critical element that limits the lifespan of the LED driver is the electrolytic capacitor. An isolated off-line LED driver is proposed in this paper, in which the required output capacitance is reduced so that the electrolytic capacitor can be omitted from the driver structure. The driver’s configuration and controlling method provide a high input power factor. Just a single switch and therefore a single controlling IC have been used in the proposed structure. The input power factor correction is implemented utilizing a boost-based method, and a novel structure is introduced for dc/dc conversion section. Power factor correction and dc/dc conversion are performed employing a simplistic and single controlling system. The output current feeding the LEDs is a high frequency pulsating current. Calculations, simulations and experimental waveforms of a laboratory prototype are presented to confirm the validity of the proposed driver.|
|LED driver؛ Electrolytic capacitor؛ Power factor|
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