Radiant energy – With charged particle beam deflection or focussing – With target means
Patent
1980-06-30
1982-03-30
Church, Craig E.
Radiant energy
With charged particle beam deflection or focussing
With target means
250421, H05G 130
Patent
active
043226256
ABSTRACT:
An x-ray tube mA regulator has an SCR phase shift voltage regulator supplying the primary winding of a transformer whose secondary is coupled to the x-ray tube filament. Prior to initiation of an x-ray exposure, the filament is preheated to a temperature corresponding substantially to the electron emissivity needed for obtaining the desired tube mA during an exposure. During the preexposure interval, the phase shift regulator is controlled by a signal corresponding to the sum of signals representative of the voltage applied to the filament transformer, the desired filament voltage and the space charge compensation needed for the selected x-ray tube anode to cathode voltage. When an exposure is initiated, control of the voltage regulator is switched to a circuit that responds to the tube current by controlling the amount of phase shift and, hence, the voltage supplied to the transformer. Transformer leakage current compensation is provided during the exposure interval with a circuit that includes an element whose impedance is varied in accordance with the anode-to-cathode voltage setting so the element drains off tube current as required to cancel the effect of leakage current variations.
REFERENCES:
patent: 3521067 (1970-07-01), Splain
patent: 3916251 (1975-10-01), Hernandez
patent: 3983396 (1976-09-01), Mulleneers
patent: 4072865 (1978-02-01), Craig
Daniels Herbert E.
Randall Harvey G.
Church Craig E.
General Electric Company
Hohenfeldt Ralph G.
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