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Filament current regulator for an X-ray system

  • US 5,272,618 A
  • Filed: 07/23/1992
  • Issued: 12/21/1993
  • Est. Priority Date: 07/23/1992
  • Status: Expired due to Term
First Claim
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1. A current supply for a filament of a vacuum tube comprising:

  • a combining circuit having two inputs and an output wherein signals applied to the two inputs are combined to produce a control signal at the output, one of the inputs for receiving a signal that indicates a desired magnitude of current to be produced by said current supply;

    a current source having a control input connected to the output of said combining circuit and having an output terminal at which said current source produces a level of current that varies in response to a signal at the control input;

    a transformer having primary and secondary windings;

    a capacitor connected across the primary winding of said transformer;

    a means, coupled to said transformer, for switching current from said current source alternately through different sections of the primary winding;

    a first means for sensing the current level produced by said current source;

    a second means for sensing a magnitude of current flowing through said capacitor; and

    means for producing a feedback signal indicative of a magnitude of current flowing through the secondary winding, which feedback signal is produced in response to said first and second means for sensing and is applied to the other input of said combining circuit.

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