| 摘要 |
A circuit arrangement for generating an x-ray tube voltage is described, comprises an inverse rectifier circuit (Gsi) for generating a high-frequency alternating voltage, a high-voltage generator (Gsu) for converting the high-frequency inverse rectifier into a high voltage for the x-ray tube, and a voltage controller (GRU), which based on a deviation of an actual 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 a controlling variable for the inverse rectifier circuit (Gsi). The circuit arrangement further comprises a measurement circuit for measuring an oscillating current (isw(t)), connected 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 (WI<-><max>), generates a second controlling variable value (YI(t)). Further, a switching device is connected downstream of the voltage controller (GRU) and the oscillating current controller and compares the first controlling variable value (YU(t)) and the second controlling variable value (YI(t)) to send the lesser of the first and second controlling variable values (YU(t) and YI(t)) onward as the resultant controlling variable value (Y(t)) to the inverse rectifier circuit (Gsi).
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