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Systems and methods for dimming multiple lighting devices by alternating transfer from a magnetic storage element

  • US 9,204,503 B1
  • Filed: 07/02/2013
  • Issued: 12/01/2015
  • Est. Priority Date: 07/03/2012
  • Status: Expired due to Fees
First Claim
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1. A circuit for powering two or more lighting devices, the circuit comprising:

  • a first output terminal for providing a first output current or voltage to a first one of the lighting devices;

    a second output terminal for providing a second output current or voltage to a second one of the lighting devices;

    a first switching circuit coupled to an input power source;

    a magnetic storage element having a primary winding coupled to the first switching circuit, wherein the first switching circuit charges the magnetic storage element from the input power source during charging intervals;

    a second switching circuit coupled to a second winding of the magnetic storage element for alternatively providing the first output current or voltage to the first output terminal during flyback intervals following the charging intervals occurring during a first synchronization phase and providing the second output current or voltage to the second output terminal during flyback intervals following the charging intervals occurring during a second synchronization phase; and

    a primary-side control circuit coupled to the first switching circuit and the second switching circuit for controlling durations of each of the first synchronization phase and the second synchronization phase.

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