High voltage power supply for an X-ray tube

A high voltage power supply for biasing an anode and a cathode of an X-ray tube

• a first source of a reference voltage level that represents a desired bias voltage magnitude for the X-ray tube;
• an anode inverter that produces an alternating anode bias voltage from a DC input voltage in response to anode inverter control signals;
• an anode voltage multiplier connected to said anode inverter to increase the alternating voltage thereby producing an anode output voltage;
• an anode voltage sensor for sensing the anode output voltage and producing a first sensor signal indicating a magnitude of the anode output voltage;
• an cathode inverter that produces an alternating cathode bias voltage from a DC input voltage in response to cathode inverter control signals;
• an cathode voltage multiplier connected to said cathode inverter to increase the alternating voltage thereby producing an cathode output voltage;
• an cathode voltage sensor for sensing the cathode output voltage and producing a second sensor signal indicating a magnitude of the cathode output voltage;
• a circuit coupled to said first source and to said anode and cathode voltage sensors, and producing a difference signal indicating a degree of difference between combination of the first and second sensor signals and the voltage level reference signal;
• an integrator connected to said circuit to integrate the difference signal to produce an integrated signal;
• a second source of a duty cycle reference signal;
• a first summation device coupled to said integrator, said second source and said anode and cathode voltage sensors for combining the integrated signal, the duty cycle reference signal and the first and second sensor signals to produce an ANODE DUTY CYCLE COMMAND signal;
• a second summation device coupled to said integrator, said second source and said anode and cathode voltage sensors for combining the integrated signal, the duty cycle reference signal and the first and second sensor signals to produce an CATHODE DUTY CYCLE COMMAND signal;
• and
• an inverter driver coupled to said integrator and said first and second summation devices for generating the cathode inverter control signals having frequencies defined by the integrator signal and duty cycles defined by the CATHODE DUTY CYCLE COMMAND signal, and generating the anode inverter control signals having frequencies defined by the integrator signal and duty cycles defined by the ANODE DUTY CYCLE COMMAND signal.