Power supply circuit for an X-ray tube

Claim 1

A power supply circuit for an X-ray tube for converting direct current to high-frequency pulses that are fed into a voltage step-up circuit of said X-ray tube, said power supply circuit comprising: (a) a direct-current source having a positive and a negative terminal; (b) a pair of transistors, each having a collector, an emitter and a base; (c) a pair of transformers, each having a primary and a secondary winding; (d) the collector of each of said pair of transistors being coupled via said primary winding of one of its said pair of transformers to said positive terminal of said direct-current source, said primary windings functioning as ballasts limiting the current passing through said pair of transistors; (e) a pair of diodes coupling said secondary windings of each of said pair of transformers in series between said positive and negative terminals of said direct-current source; (f) a control unit including a pulse-width modulator and a pair of base-control transformers coupling said modulator to their respective one of said pair of transistors, said pulse-width modulator connected to receive a feedback control signal from said voltage step-up circuit of said X-ray tube; (g) said pair of base-control transformers controlling the collector-emitter circuits of each of their said respective pair of transistors such that said pair of transistors operate in a push-pull configuration.