Input regulated high voltage D.C. power supply system

Claim 1

An X-ray generator high voltage supply system, the system including a power supply, the system comprising: a rectifier bridge having AC voltage inputted thereto; a first wave filter connected to the rectifier bridge for producing a dc signal; chopper means connected to the first wave filter for generating a pulse signal at a frequency substantially higher than the frequency of the power supply, the chopper means including a switching means; a second wave filter connected to the chopper means for filtering the pulse signal; a resonance type inverter connected to the second wave filter for receiving the filtered signal and for supplying a substantially ripple-free dc voltage having quick rise and fall times to the X-ray generator, the inverter operating at a predetermined frequency; regulation means connected to the X-ray generator for sensing the dc voltage, the regulation means using the sensed dc voltage for regulating the pulse signal produced by the chopper means by varying the duty cycle of the switching means, the regulation means including: a voltage divider connected to the X-ray generator for producing an error voltage signal; means for generating an adjustable reference voltage signal; a differential amplifier having a first input connected to the voltage divider and a second input connected to the adjustable reference voltage means for producing a difference signal; means for receiving the difference signal and for generating a driving pulse signal from the diffrence signal; wherein the driving pulse signal is transmitted as a control pulse signal for activating and deactivating the switching means.