DEVELOPMENT OF DUAL-SWITCHES BRIDGELESS PFC TOTEM-POLE SEPIC CONVERTER FOR LED DRIVER APPLICATION
DOI:
https://doi.org/10.11113/jurnalteknologi.v86.19479Keywords:
SEPIC converter, Bridgeless PFC, Totem-Pole design, PF, THDi, output voltage rippleAbstract
This paper presents a Dual-Switch Bridgeless Power Factor Correction (DSBPFC) Single Ended Primary Inductor Converter (SEPIC) with Totem-Pole circuit structure for LED Driver Application. The conventional Full-Bridge Rectifier (FBR) SEPIC converter has four diodes at the bridge and one diode at the SEPIC converter. However, the combination of two operation circuits in one converter structure has the consequence of power quality issues. Several major drawbacks of the FBR SEPIC are low power factor (PF), high total harmonic distortion of current (THDi), and high output voltage ripple. Therefore, a DSBPFC SEPIC structures with Totem-Pole method is proposed to reduce the THDi, while improving the power factor and reducing the output voltage ripple. Besides, the proposed converter requires only three diodes as compared to the full-bridge SEPIC with five diodes. The optimization parameter design is applied to ensure the THDi and output voltage ripple are minimized. In addition, to improve the quality of the AC source, the inductors are designed to operate in DCM and CCM based on the ripple-balancing concept between input and output inductors. As to reduce output voltage ripple, a high capacitance of output capacitor is used. The simulation result of the THDi is 3.8% whereas the experimental result shows that the THDi is 23.5%; which can be attributed to the parasitic component at the passive components. Furthermore, the experimental results of the output voltage ripple are 2 V with output capacitance of 3300 µF, compared to the output voltage ripple of 4.40 V for 470 µF.
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