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Lamp ballast configuration

  • US 5,030,889 A
  • Filed: 12/21/1989
  • Issued: 07/09/1991
  • Est. Priority Date: 12/21/1989
  • Status: Expired due to Fees
First Claim
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1. A lamp ballast for exciting a gas containing lamp comprising:

  • first and second circuit boards, each having first and second major surfaces;

    first and second packaged semiconductor switching devices;

    a heat sink;

    a drive transformer system including first and second control signal outputs;

    a power supply input connection;

    said first and second circuit boards having their first major surfaces disposed substantially parallel and spaced apart in a direction perpendicular thereto;

    the device package having a first major surface and extending from a connection to a first conductor on said first major surface of said first circuit board to a connection to a second conductor on said first major surface of said second circuit board;

    said heat sink having a portion extending generally parallel to the plane of said first major surface of said package which is disposed in thermal contact with said package; and

    said drive transformer system being disposed between said circuit boards with said device package disposed intermediate said transformer and said heat sink.

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