Lamp Ballasts and LED Lighting
Technical Lecture Session
Gumbo Applications 10W LED to KW Converter
LED Lighting, Power Conversion, Multichannel LED Drivers
This paper presents a novel driver topology to accurately control the current through LEDs by using a current sink, a switch mode pre-regulator, few interface components and a microcontroller employing an algorithm that controls and predicts the output state in normal and fault modes without directly measuring the output parameters. The topology is easily scaleable to realize multichannel LED drivers, supports wide range of LED loads, provides superior drive current accuracy and is modulation and flicker free. In this paper we provide an overview of the shortcomings of the commonly used multichannel topologies and demonstrate how the proposed architecture and control logic can solve those shortcomings. Experimental results are also provided to validate the operation of the proposed topology in both normal and abnormal load conditions.