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LED driver

  • US 9,603,209 B2
  • Filed: 09/03/2015
  • Issued: 03/21/2017
  • Est. Priority Date: 09/04/2014
  • Status: Active Grant
First Claim
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1. A system comprising:

  • an input configured to receive a first signal indicating desired intensity;

    an output configured to emit a second signal that conveys electricity for powering a light source according to the desired intensity; and

    a circuit for producing the second signal, the circuit connected to the input and the output and comprising;

    a processor; and

    memory storing a program for execution by the processor, the program comprising instructions for performing the steps of;

    comparing the desired intensity to a threshold;

    responsive to obtaining a first result for the comparison, selecting for the second signal a non-zero level of pulse width modulation without constant current reduction; and

    responsive to obtaining a second result for the comparison that is different from the first result, selecting for the second signal a non-zero level of constant current reduction without pulse width modulation.

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