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X-ray tube current control with constant loop gain

  • US 4,930,146 A
  • Filed: 07/10/1989
  • Issued: 05/29/1990
  • Est. Priority Date: 07/10/1989
  • Status: Expired due to Term
First Claim
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1. In a current control system for an x-ray tube having a filament driver which supplies current to the x-ray tube filament in response to a preheat command signal, the improvement comprising:

  • means for producing a tube current feedback signal which indicates the amount of current flowing between the filament and the anode of the x-ray tube;

    means for producing a command signal which is proportional to the reciprocal of a tube current command;

    multiplying means for multiplying the tube current feedback signal by the command signal to produce a tube current error signal;

    subtraction means for subtracting the tube current error signal from a reference signal to produce a corrected tube current error signal;

    summing means for combining the preheat command signal with the corrected tube current error signal to produce a filament command signal to control the tube filament temperature and cause the tube current to attain a value indicated by the tube current command; and

    means for supplying said filament command signal to said filament drive.

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