Mas regulator circuit for high frequency medical X-ray generator

This patent describes a MAS regulating systems for a high frequency medical X-ray generator having an X-ray tube, for producing a control signal to stop the exposure when the milliamp-seconds delivered by the X-ray tube becomes equal to or greater than a desired maximum amount set by an operator, the system consists of: fist converter circuit means for converting a signal corresponding to a desired MAS value set by the operator into a first digital signal having a predetermined format; digital integrator circuit means for integrating and converting the actual MA current in the X-ray tube to a digital MAS signal corresponding to the actual MAS value of the current in the X-ray tube, the MAS signal is in the form of a second digital signal of the same predetermined format as the first digital signal; and comparing circuit means for comparing the first and second digital signals and for producing a control signal to stop the exposure when the second digital signal is greater than the digital signal