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Current feedback for improving performance and consistency of LED fixtures

  • US 9,894,725 B2
  • Filed: 03/05/2014
  • Issued: 02/13/2018
  • Est. Priority Date: 03/14/2013
  • Status: Expired due to Fees
First Claim
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1. A lighting system comprising:

  • a driver controller configured to output an independent control signal to each of a plurality of power controllers, the power controllers configured to control respective power converters;

    the plurality of power converters connected to mains voltage and configured to provide a driving current responsive to each independent control signal, wherein each power converter is configured to output respective driving currents to a plurality of strings of LEDs;

    a voltage measurement circuit configured to provide a voltage sense signal indicative of an amplitude of the mains voltage; and

    a light-emitting diode (LED) module comprisingthe plurality of strings of LEDs that emit light responsive to the driving currents,a plurality of amplifiers, each amplifier connected to one of the plurality of strings of LEDs and configured to amplify an LED current through each corresponding string;

    a multiplexer connected to the outputs of the plurality of amplifiers, configured to receive the amplified LED currents as detected LED currents of each string and selectively output the detected LED currents, andan analog to digital converter connected to the multiplexer configured to convert the detected LED currents as selected by the multiplexer into digital signals and output the digital signals as current feedback signals;

    wherein the driver controller is configured to output the control signals responsive to the voltage sense signal and each respective current feedback signal.

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