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Modular high frequency ballast architecture

  • US 6,320,329 B1
  • Filed: 07/30/1999
  • Issued: 11/20/2001
  • Est. Priority Date: 07/30/1999
  • Status: Expired due to Fees
First Claim
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1. A modular high frequency ballast for powering at least two lamps, comprising:

  • a module for each lamp, each module including at least one inverter; and

    a controller for independently operating each module, said controller responsive to at least one feedback signal from each lamp, each feedback signal corresponding to at least one of a lamp voltage and a lamp current of each lamp, and the controller being configured to generate driving signals for controlling the switching frequency of each inverter;

    wherein;

    at least two modules are operated substantially 180°

    out of phase from each other and the controller, in response to the feedback signal, adjusts duty cycles of the driving signals supplied to each inverter.

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