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Tri-color flasher for strings of dual polarity light emitting diodes

  • US 5,256,948 A
  • Filed: 04/03/1992
  • Issued: 10/26/1993
  • Est. Priority Date: 04/03/1992
  • Status: Expired due to Fees
First Claim
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1. An electronic control unit connectable to a source of AC power for driving a string of dual-polarity dual-color LEDs to produce a sequential plurality of colors, comprising:

  • clock means to generate a plurality of timing pulses;

    counting means receiving said timing pulses and producing a plurality of binary signals establishing a plurality of sequential states;

    decoding means receiving said plurality of binary signals and actuating selected output lines corresponding to said binary signals and to said plurality of sequential states;

    waveform conversion means receiving said selected output lines and generating control signals capable of selectively controlling a plurality of optocouplers according to said plurality of sequential states;

    a plurality of optocouplers having their controlled path operatively connected with differing AC conduction characteristic between said source of AC power and said string of LEDs, and their controlling input operatively connected to said waveform conversion means for selectively providing power to said LEDs according to said plurality of sequential states;

    whereby the combined conduction through said plurality of optocouplers between said source of AC power and said string of LEDs establishes a plurality of differing AC conduction characteristics during each of said plurality of sequential states;

    thereby producing a sequential plurality of colors in said string of LEDs.

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