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Driver circuit for powering a DC lamp in a non-DC lamp fitting

  • US 8,575,856 B2
  • Filed: 06/01/2011
  • Issued: 11/05/2013
  • Est. Priority Date: 06/01/2011
  • Status: Active Grant
First Claim
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1. A driver circuit for adapting a dc lamp to operate with any of an ac power supply, an electromagnetic ballast or an electronic ballast, comprising:

  • a first stage comprising a filter circuit and having an input connectable to any of an ac power supply, an electromagnetic ballast or an electronic ballast;

    a second stage comprising a high frequency switched network and having an input connected to an output of the first stage; and

    a third stage comprising an ac/dc converter and having an input connected to an output of the second stage and an output connectable to a dc lamp, said third stage being configured to deliver dc power to a connected dc lamp;

    wherein said second stage is configured to operate in a low frequency mode when said driver circuit is connected to an ac power supply or an electromagnetic ballast and configured to operate in a high frequency mode when said driver circuit is connected to an electronic ballast.

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