H - Electricity – 05 – G
Patent
H - Electricity
05
G
355/33
H05G 1/34 (2006.01)
Patent
CA 1156376
X-RAY TUBE CURRENT CONTROL Abstract of the Disclosure The present invention relates generally to a closed loop feedback system for controlling the current output of an x-ray tube. The system has circuitry for improving the transient response and stability of the x-ray tube current over a substantial nonlinear portion of the tube current production characteristic. The system includes a reference generator for applying adjustable step function reference signals representing desired tube currents. The system also includes means for instantaneous sensing of actual tube current. An error detector compares the value of actual and reference tube current and produces an error signal as a function of their difference. The system feedback loop includes amplification circuitry for controlling x- ray rube filament DC voltage to regulate tube current as a function of the error signal value. The system also in- cludes compensation circuitry, between the reference generator and the amplification circuitry, to vary the loop gain of the feedback control system as a function of the reference magnitude.
361294
Dupuis Walter A.
Resnick Theodore A.
Picker Corporation
Ridout & Maybee Llp
LandOfFree
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