X-Ray diagnostic generator with an inverter supplying the high-tension transformer

An x-ray diagnostic generator comprising

• an inverter having an input and an output and having a controllable frequency of operation,
• a high tension transformer having an input connected with the output of the inverter, and having an output,
• a high tension rectifier having an input connected with the output of the high tension transformer, and having an output,
• high tension capacitors connected at the output of the high tension rectifier,
• control loop means for receiving respective pairs of set point value signals in accordance with respective settings of x-ray tube voltage and current, and operable for sensing actual value signals in accordance with actual values of x-ray tube voltage and current and for controlling x-ray tube voltage and current to minimize errors between the settings of x-ray tube voltage and current, and the actual values thereof,
• said control loop means comprising x-ray tube voltage control means (7, 20, 21, 21a, 30) connected with said inverter and operable to control inverter frequency to minimize the error between an x-ray tube voltage set point value signal and an x-ray tube voltage actual value signal, and
• direct current supply means (16-19) connected with the input of said inverter (7) and operable for controlling the voltage supplied to said inverter,
• program storage means (23) for supplying an optimum value signal in accordance with an optimum value of inverter input voltage for each pair of settings of x-ray tube voltage and current to be received by said control loop means, and
• inverter input voltage control means (24-29) connected with said direct current supply means (16-19) for setting the voltage supplied to said inverter (7) and connected with said storage means (23) and responsive to the optimum value signal therefrom to set the inverter input voltage at an optimum value during an operation of said generator with corresponding settings of x-ray tube voltage and current.