Controlled single pulse blocking converter

Claim 1

A single pulse blocking converter for generating a constant output voltage, comprising: a transformer including an input winding, an output winding for providing an output voltage, a feedback winding and a measuring winding; a switching transistor including a base, an emitter and a collector, the collector-emitter path of said switching transistor connected in series with said input winding; a driving transistor for driving said switching transistor to conductive and blocked conditions including a base, an emitter, and a collector, the collector-emitter path of said driving transistor connected to said feedback winding and to the base of said switching transistor to supply base current thereto; a control transistor for controlling said driving transistor including a base, an emitter and a collector, the base-emitter path of said control transistor connected to said measuring winding and the emitter-controller path connected to the base-emitter circuits of said driving and switching transistors to control the operation of said driving transistor in accordance with the voltage developed at said measuring winding which is proportional to the output voltage; and an auxiliary circuit comprising generating means for producing periodic pulses and a further transistor including a base, an emitter and a collector, said base connected to said pulse generating means and to said collector of said switching transistor, and the collector-emitter path of said further transistor connected in parallel with the collector-emitter path of said control transistor, said further transistor operable to apply a blocking voltage to said switching transistor during the transition of said switching transistor toward the blocked condition and remove the blocking voltage in response to a potential shift of a pulse from said generating means.