Retrofit LED Lighting System with Circuit Level Enhancement

摘要

A light emitting diode retrofit lamp for replacement of fluorescent lamp or tube driven by fluorescent ballast is provided. The retrofit lamp consists of an enhanced circuit that overcomes the compatibility issues with the fluorescent ballasts. The circuit of the retrofit lamp comprises a deflickerizer circuit that prevents the flicker in the lamp when the lamp operates in the frequency range of 0.1 Hz to 60 Hz. The deflickerizer circuit further provides a method to align frequency with the ballast frequency and maintains phase to avoid low frequency interference.

主权项

1. A retrofit light-emitting diode lamp adapted to work on a ballast comprising:
a plurality of input pins at the end of the retrofit lamp for connection to a first and a second lamp connection terminal of the ballast; a bridge rectifier connected to the first and second lamp terminal connection of the ballast; a light-emitting diode array connected to the output terminal of the bridge rectifier by a reactive coupling; a deflickerizer circuit connected to the light-emitting diode array; and a field-effect transistor, wherein the deflickerizer circuit prevents the appearance of flicker in the retrofit light-emitting diode lamp when the alternating current frequency is in the range of 0.5 Hz to 60 Hz, wherein the deflickerizer circuit comprises a low dropout regulator, a plurality of op amplifiers, a plurality of resistors and capacitors, and wherein the bridge rectifier converts the alternating current supplied by the alternating current ballast to direct current for an light-emitting diode array.