X-ray diagnostic generator in which the x-ray tube voltage is regulated via the x-ray tube current

US4191891A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Heribert Amtmann · Langensendelbach, DE
• Hans Ebersberger
• Guenter Eckardt · Nuremberg, DE
• Hans-Joachim Greiner · Kerzenheim, DE

Key dates

• Filing date: Nov 9, 1978
• Grant date: Mar 4, 1980
• Expiry date: Nov 9, 1998

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05G1/32
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

In an exemplary embodiment, the control circuit for controlling filament current to maintain x-ray tube voltage at a set point value is disabled near the beginning of an x-ray exposure by the cut-off of filament current to provide a falling load characteristic as a function of time. During the cooling of the x-ray tube filament, the x-ray tube voltage is maintained near its set point value by the timed switching of taps of a variable-ratio transformer to change the input voltage to the x-ray tube high voltage transformer, and by the coordinated changing of the loading of the primary circuit of such high voltage transformer, the control circuit for maintaining x-ray tube voltage at the set point value thereafter being placed in control of the filament current for the remainder of the x-ray exposure.