A Single Switch Low Cost LED Driver with Wireless Dimming Controls

Abstract

In order to nullify the source and light output power and to minimize the low frequency LED current ripple, electrolytic capacitors are generally used for energy efficient residential, industrial and commercial lighting. The life of an electrolytic capacitor is at least 13 times less than that of an LED bulb which affects the life of the LED lamp. To increase the age of the LED lighting fixture, an offline LED driver that does away with electrolytic capacitors or intricate input current control techniques to reduce the low-frequency (i.e., 100 or 120 Hz) output ripple is presented here. The single switch circuit reduces the energy storage capacitance to a few microfarads range, so that reliable film capacitor can be used instead of unreliable electrolytic capacitor. Simulation and hardware results are given on a 8-W LED lamp to validate the novelty of the circuit. The remote controlling mechanism enables to automatically turn ON ,OFF and dim even the non dimmable LED lighting system. Moreover, the system is suitable for any industrial. commercial and industrial lighting applications. The LED driver system also operates with high power factor of 0.99 in accordance with Energy star criteria for Solid State Lighting Luminaries and low Total Harmonic Distortion of 20% which is within the limits of IEC 61000-3-2 Class C standards. There is no flickering as the switching occurs at high frequency.