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Lighting system having a dimming color simulating an incandescent light

  • US 8,581,520 B1
  • Filed: 09/06/2012
  • Issued: 11/12/2013
  • Est. Priority Date: 05/14/2012
  • Status: Active Grant
First Claim
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1. A lighting system, comprising:

  • a light having a white light source and a color light source;

    a control circuit controlling said white and color light sources in response to a brightness control signal corresponding to a selected brightness level of said light;

    said control circuit pulsing said white light source and said color light source when said light is within a range of brightness levels, and in response to a change in said brightness control signal, said control circuit changing duty cycles of said white and color light sources, to alter a perceived color output of said light;

    a switch controlling one of said white light source and said color light source;

    a signal generator producing a periodic signal;

    a comparator receiving said periodic signal from said signal generator and controlling said switch;

    said comparator comparing a reference voltage to a signal voltage, said reference voltage relating to an aggregate current driving said white and color light sources and said signal voltage relating to said periodic signal; and

    said switch being in one of an open state and a closed state when said reference voltage exceeds said signal voltage and being in an other of said open and closed states when said signal voltage exceeds said reference voltage.

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