LED current control

  • US 9,468,055 B2
  • Filed: 10/24/2011
  • Issued: 10/11/2016
  • Est. Priority Date: 10/24/2011
  • Status: Active Grant
First Claim
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1. A light emitting diode (LED) control system, comprising:

  • two or more digital dimming controls, each of which is configured to receive a corresponding one of two or more pulsed channel current control signals, wherein each of the two or more pulsed channel current control signals is characterized by a corresponding channel duty cycle, wherein each of the two or more dimming controls is configured to provide an output signal directly coupled to a corresponding one of two or more ON-OFF switches without passing the output signal through a regulator, wherein each of said two or more ON-OFF switches is coupled in series with a corresponding one of a plurality of parallel LED channels; and

    an average current balance element having circuitry configured to receive a pulsed control signal input characterized by an input duty cycle and two or more current sense input signals, wherein each of the two or more current sense input signals is indicative of a current through a corresponding one of the plurality of parallel LED channels, wherein the circuitry is further configured to provide the two or more pulsed channel current control signals to corresponding ones of the two or more digital dimming controls, wherein the circuitry is additionally configured to adjust the channel duty cycle of each of the two or more pulsed channel current control signals relative to the input duty cycle in response to the two or more current sense input signals.

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