X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1983-06-08
1985-05-28
Smith, Alfred E.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378110, 378112, G03B 4116, H05G 130, H05G 110
Patent
active
045204942
ABSTRACT:
A falling load type X-ray diagnostic apparatus comprises a low voltage power source, AC-DC converting means connected to the low voltage power source so as to apply a rectified low DC voltage, chopping means connected to the AC-DC converting means and chopping said DC voltage into a low AC voltage, high voltage applying means for transforming said low AC voltage into a high AC voltage, said high AC voltage being applied as a tube voltage to an X-ray tube from which X-rays are irradiated toward an object to be examined, means for controlling a filament heating power of the X-ray tube, programming means for supplying a control signal to said filament heating control means so as to reduce the emission current of said X-ray tube during the irradiation, and chopper control means for controlling the chopping ratio of said chopping means by evaluating said rectified DC voltage with a preset tube voltage generated in said programming means, said programming means compensating said tube voltage by receiving said control signal in such a manner that said tube voltage is maintained substantially constant during the irradiation by varying said preset tube voltage so as to control the chopping ratio based upon the reduction of the filament heating power for the X-ray tube.
REFERENCES:
patent: 3939352 (1976-02-01), Mester
patent: 3974385 (1976-08-01), Grim
patent: 4167670 (1979-09-01), Ingold
patent: 4253048 (1981-02-01), Osako
patent: 4295049 (1981-10-01), Ebersberger et al.
patent: 4309612 (1982-01-01), Aichinger
patent: 4317040 (1982-02-01), Wuerflein
Arita Masataka
Matsubara Mitsuyoshi
Grigsby T. N.
Smith Alfred E.
Tokyo Shibaura Denki Kabushiki Kaisha
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