Novel Flicker Migration and EMI Noise Reduction Circuit for AC Direct LED Lightings

Abstract

A novel AC direct light emitting diode (LED) driver circuit that uses flicker mitigation and the electromagnetic interference (EMI) noise reduction method is proposed in this study. This method is based on the current controls of the flicker mitigation capacitor using MOSFET. The core block of the proposed circuit is fabricated as an IC chip. LED lightings are fabricated with the IC chip. The lightings show a flicker index of 0.15, and a 20dBμV peak value and 35dBμV average value of conduction noise margin for EMI regulation. It can be applied to the low power and low cost single chip LED lightings.