CURRENT FEEDBACK FOR IMPROVING PERFORMANCE AND CONSISTENCY OF LED FIXTURES

摘要

A lighting system includes a power converter connected to mains voltage and configured to provide a driving current responsive to a control signal. A voltage measurement circuit is configured to provide a voltage sense signal indicative of an amplitude of the mains voltage. A light-emitting diode (LED) module includes at least one string of LEDs that emit light responsive to the driving current, and is configured to detect an LED current through the at least one string and output a current feedback signal indicative of the detected LED current. A driver controller is configured to output the control signal responsive to the voltage sense signal and the current feedback signal.

主权项

1. A lighting system comprising:
power converter connected to mains voltage and configured to provide a driving current responsive to a control signal; a voltage measurement circuit configured to provide a voltage sense signal indicative of an amplitude of the mains voltage; a light-emitting diode (LED) module comprising a plurality of strings of LEDs that emit light responsive to the driving current, and configured to detect respective LED currents through each of the strings and output a current feedback signal indicative of the detected respective LED currents; and a driver controller configured to output the control signal responsive to the voltage sense signal and the current feedback signal, wherein the power converter is configured to output respective driving currents to the strings responsive to the voltage sense signal and the current feedback signal indicative of the detected respective LED currents.