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Light source system and method for driving light emitting diodes

  • US 8,618,738 B2
  • Filed: 03/08/2011
  • Issued: 12/31/2013
  • Est. Priority Date: 11/12/2010
  • Status: Active Grant
First Claim
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1. A light source system, comprising:

  • a light emitting diode (LED) module, comprising a plurality of LED strings operated under a direct current (DC) output voltage; and

    a driving unit, coupled to the LED module, and used for providing the DC output voltage by adopting a boost means and generating a plurality of pulsation current signals by adopting means of at least a random number or an increasing or decreasing function according to a setting signal, so as to respectively drive the LED strings,wherein frequencies of the pulsation current signals are higher than a predetermined frequency,wherein the predetermined frequency is a highest audio frequency in an audible acoustic wave range, and the highest audio frequency in the audible acoustic wave range is 20 KHz.

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