High PFC Integrated Stage Single Switch AC-DC System for LED Power Driver

Abstract

LED has replaced the conventional Lighting sources due to its extraordinary characteristics like high efficiency, CRI value, low cost, longevity, easy controlling, easy dimming, etc. LED works either on constant current or constant voltage supply. (a) The AC-DC system driving the LED shall comply with stringent standards such as IEC61000-3-2, Energy star, etc. Many LED driver circuits based on Two-stage, single-stage, or integrated topologies are available to comply with stringent standards. To (b) reduce the cost, size, and volume of the AC-DC system for High power LED driver, an integrated stage LED driver is a popular choice. This paper presents an isolated Integrated stage single switch LED driver circuit. The integrated stage is a combination of the SEPIC and Flyback converter. The single (c) switch is controlled via a quasi sliding mode controller(QSMC) to enhance its driving characteristics, where the outer voltage loop is the PI controller and the inner current loop is the sliding mode controller. A detailed analysis, operation, and control are presented. The proposed topology’s results are verified using MATLAB/SIMULINK environment.