Pulsate X-ray generating apparatus
AssigneeTokyo Shibaura Electric Co., Ltd.
InventorsKazumitu Kawamura, Mitsuru Yahata
Life of this patent
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Abstract
A capacitor connected between the anode and cathode of an X-ray tube through an X-ray switch is charged by a DC output voltage including ripple component from a rectifier connected to the secondary of a high-tension transformer. The primary of the high-tension transformer is connected to a switching circuit. A switching control circuit produces a turn-on signal for the switching circuit when a pulse signal derived from a phase detector in synchronism with a given phase of the ripple component, an X-ray exposure instruction signal and a charge instruction signal formed in a comparator are logically processed, and a turn-off signal when the charge voltage of the capacitor reaches a given value. The switching circuit is ON-OFF controlled by the switching control circuit.
Claims6
A pulsate X-ray generating apparatus comprising:
- a switching circuit for coupling to and from a power source;
- a high-tension transformer having primary and secondary windings, said primary winding being coupled to said switching circuit, said transformer producing a boosted AC voltage;
- a rectifier coupled to said secondary winding for rectifying said boosted AC voltage producing a DC voltage having a ripple component;
- at least one high-tension capacitor coupled to said DC voltage from said rectifier;
- an X-ray switch coupled to said capacitor;
- an X-ray tube coupled to said X-ray switch;
- a comparator coupled to said capacitor for producing a charge instruction signal as long as the detected charge voltage of said high-tension capacitor is below a predetermined threshold level;
- a phase detector for generating a pulse signal in synchronism with a given phase of said ripple component of said DC voltage;
- and
- a switching control circuit coupled to said comparator and to said phase detector and receiving signals therefrom for producing a control signal for controlling said switching circuit, said control signal enabling said switching circuit only when both a charge instruction signal from said comparator and a pulse from said phase detector are present and maintaining the enabled condition as long as said charge instruction signal remains present.
Dependencies are inferred from the claim text.