Switching regulator type power supply circuit

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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Details

363 97, 363131, H02M 3335

Patent

active

048020761

ABSTRACT:
A switching regulator type power supply circuit comprises a converter transformer, a blocking oscillation circuit comprising a transistor having a collector connected to a rectifying output of an AC power supply through the input winding of the transformer and an emitter and a base connected to a positive feedback winding of the transformer, and a switching control circuit connected between the base of the transistor and a fluctuation detecting winding and the positive feedback winding of the converter transformer. Still another switching transistor is connected between the base of the switching transistor and the positive feedback winding and a proportional current supply circuit comprising a coil and a Zener diode is connected to the emitter and the base, the base having a resistor for bias connected thereto. As a result, when a fluctuation of the input voltage applied to the input winding or a fluctuation of a load connected to the output winding occurs, a base current in accordance with the fluctuation of the collector current is supplied to transistor for blocking oscillation.

REFERENCES:
patent: 4327404 (1982-04-01), Horiguchi
patent: 4488210 (1984-12-01), Shono
patent: 4649464 (1987-03-01), Shono
patent: 4654772 (1987-03-01), Thorne

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