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AC LED lamp involving an LED string having separately shortable sections

  • US 20110227485A1
  • Filed: 03/19/2010
  • Published: 09/22/2011
  • Est. Priority Date: 03/19/2010
  • Status: Active Grant
First Claim
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1. An integrated circuit comprising:

  • a first terminal;

    a second terminal;

    a power switch coupled to selectively couple the first and second terminal; and

    a control circuit adapted to control the power switch based at least in part on an electrical characteristic of a string of Light Emitting Diodes (LEDs) external to the integrated circuit and an input voltage, wherein during a first time a current flows through the power switch, wherein during a second time a current does not flow through the power switch, and wherein the input voltage during the second time is higher than the input voltage during the first time.

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