Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1981-12-22
1984-01-24
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
323284, 323285, 361 93, H02H 308
Patent
active
044280157
ABSTRACT:
A circuit is disclosed which provides overcurrent protection for switching regulator power supplies with soft start and soft turn OFF features. The invention includes first means for sensing the current through the switching transistor of the regulator and second means for providing a voltage signal to the switching transistor deactivation circuitry whenever the current through the switching transistor exceeds a predetermined threshold. In a specific embodiment, the current generator is provided by a transistor biased for nominal operation in its active mode. The means for sensing the current through the switching transistor is provided by a resistor the voltage drop across which provides the input voltage threshold to the bipolar transistor current generator. The current generated by the transistor causes a voltage to quickly develop across an RC network referenced to ground potential. This voltage is then compared to a reference potential by a comparator circuit which provides an electrical signal as an input to the base drive circuit for the switching regulator switching transistor.
REFERENCES:
patent: 3629622 (1971-12-01), Denenberg, Jr.
patent: 3736469 (1973-05-01), Baugher et al.
patent: 3906310 (1975-09-01), Esashika
patent: 3982173 (1976-09-01), Berry et al.
patent: 4278930 (1981-07-01), Rogers
Benman, Jr. W. J.
Bethurum W. J.
Hughes Aircraft Company
Karambelas A. W.
Moose Jr. Harry E.
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