Patent ID: 6768786
Filing Date: 2004-07-27
Classification: H05G

Abstract:
A circuit arrangement, for generating an x-ray tube voltage, comprising:an inverse rectifier circuit (Gsi) for generating a high-frequency alternating voltage, a high-voltage generator (Gsu) for converting the high-frequency alternating voltage into a high voltage for the x-ray tube, a voltage controller (GRU), which based on a deviation of an x-ray tube voltage (VU(t)) from a set-point x-ray tube voltage (WU(t)) generates a first controlling variable value (YU(t)) for the inverse rectifier circuit (Gsi), a measurement circuit for measuring an oscillating current (isw(t)) applied to one output of the inverse rectifier circuit (Gsi) of the high-frequency alternating voltage, an oscillating current controller (GRI), which based on a deviation of an ascertained actual oscillating current value (VI(t)) from a predetermined maximum oscillating current value (WIâˆ’max) generates a second controlling variable value (YI(t)) for the inverse rectifier circuit (Gsi), and wherein a switching device, connected downstream of the voltage controller (GRU) and the oscillating current controller (GRI), operable to compare the first controlling variable value (YU(t)) and the second controlling variable value (YI(t)) and is operable to send the lesser of the first and second controlling variable values (YU(t) and YI(t)) onward as a resultant controlling variable value (Y(t)) to the inverse rectifier circuit (Gsi).