Integrated ac/dc converter consisting of three stages for LED driver applications

Document Type : Original Article

Authors

1 Department of Electrical Engineering, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran.

2 Department of Electrical Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

Abstract

The important features of LED (Light Emited Diode) drivers are low current ripple on the output side, high power factor on the ac side and to extent possible avoid using electrolytic capacitors In order to solve this problem, in this paper, an integrated non-isolated LED driver consisting of three stages is proposed, which is composed of three dc-dc converters. The proposed integrated driver has only one active power switch. Therefore, the volume and complexity of the structure is reduced. Additionally, the main characteristics of the proposed driver are high power factor, low current flicker in the output and eliminating need for electrolytic capacitor. Then to show the performance of the driver based on the duty cycle variation, the proposed driver has been analyzed step by step. Semiconductors voltage stress and voltage ripple of capacitors have been calculated, and in order to simultaneously control the output current and the input power factor, a linear controller has been designed and used. The simulation and the experimental results have been presented to validate the feasibility and versatility the proposed LED driver. In the provided results, the ripple of the output current and the harmonic of the input current are within the acceptable range according to the standards, and additionally without using electrolytic capacitor, the desired output current and high input power factor have been obtained.

Keywords

Main Subjects

References

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