AC light emitting diode and AC LED drive methods and apparatus

  • US 8,148,905 B2
  • Filed: 02/03/2009
  • Issued: 04/03/2012
  • Est. Priority Date: 02/25/2004
  • Status: Active Grant
First Claim
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1. A lighting system comprising:

  • two or more LED circuits each LED circuit having at least two diodes connected to each other in opposing parallel relation, at least one of which such diodes is an LED;

    a driver connected to the two or more LED circuits, the driver providing AC voltage and current to the two or more LED circuits, the driver having an input of a first AC voltage and a first frequency and an output of a second AC voltage and a second frequency, which the second AC voltage is a relatively fixed voltage and the second frequency is a relatively higher frequencywherein the driver and the two or more LED circuits forming a driven circuit and the driver and the two or more LED circuits being configured such that one or more LED circuits can be added to or subtracted from the driven circuit so long as the total wattage output of the driver is not exceeded;

    (a) without significantly affecting a pre-determined desired output range of light from any individual LED;

    (b) without the need to;

    (i) change a value of any discrete component;

    or, (ii) to add or subtract any discrete components, of any of the pre-existing driven circuit components which remain after the change.

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