HIGH POWER FACTOR ELECTRONIC LIGHTING SYSTEM EMPLOYING THE SEPIC AND HALF-BRIDGE INVERTER FOR AC POWER LEDS

  • LUIZ HARUKI OKIDA Federal University of Technology of Parana (UTFPR)
  • CLAUDINOR BITENCOURT NASCIMENTO Federal University of Technology of Parana (UTFPR)
Keywords: AC Power LEDs, SEPIC converter, Half-Bridge inverter, Power Factor Correction

Abstract

The use of LEDs that operate in alternating current (ac) can be considered with a good solution for lighting system applications. With high direct breakdown voltage and low driving current, through a resistor element, the AC power LEDs can be directly connected to the power supply. However, the direct connection in the power supply produces a high harmonic distortion in input current and the IEC 61.000-3-2 is not attended. This paper presents the study of an electronic lighting system with power factor correction (PFC) to drive AC power LEDs employing the SEPIC converter associated to the Half-Bridge voltage inverter. SEPIC converter carries out the power factor correction and DC bus voltage regulation. Half-Bridge inverter operating with asymmetrical PWM gate pulses, i.e., using I–LFSQW (Low Frequency Square Wave Current) technique, carries out the reversal of voltage and current in the load. Simulation results for two conduction modes (DCM-Discontinuous Conduction Mode and BCMBoundary Conduction Mode) and experimental results for DCM are presented.

Published
2020-10-29
Section
Articles