High voltage DC generator with reduced ringing and voltage fluctuation

Claim 1

A high voltage DC generator comprising: a setup transformer having primary and secondary windings, the primary winding being responsive to a pulse from a pulse generating circuit for inducing a high-voltage potential in said secondary winding; a first pair of first and second diodes connected in series in a first circuit from a first end terminal of said secondary winding to a first output terminal of said generator; a second pair of first and second diodes connected in series in a second circuit from a second end terminal of said secondary winding to a second output terminal of said generator; a first capacitor connected between said second end terminal and a junction of the diodes of the first pair; a second capacitor connected between said first end terminal and a junction of the diodes of said second pair, the first diodes of said pairs being arranged to simultaneously conduct in response to said pulse to cause a current to pass through said first and second capacitors in a first direction and the second diodes of said pairs being arranged to simultaneously conduct in response to the cessation of said pulse to cause a current to pass through said first and second capacitors in a second, opposite direction; a bleeder resistor connected across said first and second output terminals; and a ringing reduction circuit comprising a resistive element, a capacitive element and a diode element, said diode and capacitive elements being arranged such that when one of said first and second diodes of each pair conducts, said diode element is conductive to charge said capacitive element, said resistive element being in circuit with said capacitive element to pass a current therethrough in response to the cessation of said pulse.