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Bridgeless SEPIC PFC Converter for Multistring LED Driver

  • Aman Jha
  • Bhim Singh
Original Contribution
  • 75 Downloads

Abstract

This paper deals with Power Factor Correction (PFC) in Low Voltage High Current (LVHC) multi-string light emitting diode (LED) using a bridgeless (BL) single ended primary inductance converter (SEPIC). This application is designed for large area LED lighting with illumination control. A multi-mode LED dimming technique is used for the lighting control. The BL-SEPIC PFC converter is used as a load emulator for high power factor. The regulated low voltage from flyback converter is a source power to the synchronous buck converters for multi-string LED driver and forced cooling system for LED junction. The BL-SEPIC PFC converter inductor design is based on Discontinuous Inductor Current Modes (DICM) which provides good PFC at low cost. Test results are found quite satisfactory for universal input AC (90–265 V). There is significant improvement in the power factor and input current Total Harmonic Distortion (THD) with good margin of harmonic limits for lighting IEC 61000-3-2 Class C.

Keywords

BL-SEPIC converter DC–DC converter Flyback converter LED control Power factor correction Total harmonic distortion Power quality 

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Copyright information

© The Institution of Engineers (India) 2018

Authors and Affiliations

  1. 1.ST Microelectronics Pvt. Ltd.Greater NoidaIndia
  2. 2.Indian Institute of Technology DelhiNew DelhiIndia

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