Closed loop x-ray tube current control

Details Closed loop x-ray tube current control Closed loop x-ray tube current control

1986-09-19

1988-10-04

Howell, Janice A.

X-ray or gamma ray systems or devices

Electronic circuit

X-ray source power supply

378109, 378112, H05G 134

Patent

active

047759925

ABSTRACT:
Between scans, a stand-by control (40) causes a filament current power supply (44) to supply a low level of power to a tube filament (46). When x-rays are to be generated, a non-linear digital to analog converter (50) supplies a filament current control signal which is estimated to provide a selected tube current. A space charge compensation circuit adds an offset to the selected filament signal to compensate for the selected voltage at which the tube is to be operated. A current boost circuit (70) adds an incremental current boost (26) of a magnitude in accordance with a function of the difference between the actual filament temperature and the normal operating temperature in order to bring the filament up to operating temperature more quickly. A feedback loop (90 to 98) adjusts the selected filament current signal in accordance with any difference between the selected tube current and the actual tube current. A damping circuit (110) reduces the rate of change of the error signal such that the filament current changes at a rate commensurate with the heating rate of the filament.

REFERENCES:
patent: 4072865 (1978-02-01), Craig et al.
patent: 4311913 (1982-01-01), Resnick et al.
patent: 4366575 (1982-12-01), Bax
patent: 4593371 (1986-06-01), Grajewski

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