D.c. converter having control transistor in blocking oscillator feedback

Claim 1

A DC voltage level converter apparatus utilizing current feedback network to provide fast switching and control comprising in combination: a control transistor having a base, emitter and collector, said base having an input resistor connected thereto, said input resistor receiving a control signal, an output transistor having a base, emitter and collector, said base of said output transistor being connected to said emitter of said control transistor, said output transistor being responsive to said control signal which is applied to said control transistor, a negative voltage supply terminal to receive a negative voltage, said base of said control transistor being connected to said negative voltage supply terminal by a base resistor, said emitter of said output transistor being directly connected to said negative voltage supply terminal, a current feedback transformer having a primary and a secondary winding, said primary winding having one end connected to said collector of said output transistor, said secondary winding having one end connected to said collector of said control transistor, the other end of said secondary winding being connected to said negative voltage supply terminal; and, a positive voltage supply terminal to receive a positive voltage, said positive voltage supply terminal having an inductor connected thereto, the other end of said inductor being connected to the other end of said primary winding of said current feedback transformer, a first capacitor connected between said positive voltage supply terminal and said negative voltage supply terminal, a diode having an anode and a cathode, said anode being connected to said junction of said inductor and said secondary winding, said cathode providing an output terminal, a second capacitor being connected between said cathode and said negative voltage supply terminal.