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High efficiency, low energy storage driver circuit for solid state light sources

  • US 8,896,220 B2
  • Filed: 03/06/2012
  • Issued: 11/25/2014
  • Est. Priority Date: 03/07/2011
  • Status: Active Grant
First Claim
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1. A system to drive light emitting diodes (LEDs) comprising:

  • a string of LEDs coupled across a voltage source configured to provide an input voltage, the string of LEDs comprising a plurality of separate groups of LEDs;

    a plurality of switch circuits, each of the switch circuits comprising a switch coupled in parallel with an associated one of the groups of LEDs to control current flow through the associated group of LEDs in response to a control signal from a controller circuit;

    a switch protection circuit associated with at least one of the switches; and

    a steering circuit for each of the groups of LEDs wherein each steering circuit comprises a first steering diode in series with the associated group of LEDs and the associated switch circuit, and a second steering diode in series with the associated group of LEDs and the associated switch circuit.

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