Protective circuit for a switching regulator

Details Protective circuit for a switching regulator Protective circuit for a switching regulator

1978-10-04

1980-07-01

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 98, 361103, 363 21, H02H 710

Patent

active

042109477

ABSTRACT:
A protective circuit for a switching regulator includes a DC voltage source having a pair of terminals, a transformer having primary, secondary windings and a magnetic core, a switching transistor having first, second and third electrodes, a circuit for connecting the second and third electrodes between the pair of terminals through the primary winding, a DC output circuit connected across the secondary winding to produce a DC signal in response to the ON/OFF operation of the switching transistor, a control circuit connected to the first electrode of the switching transistor so as to ON/OFF-control the switching transistor in response to the DC signal, a detecting circuit for detecting an over-current flowing through the primary winding of the transformer and for producing a control signal in accordance with a change of the saturated magnetic flux density of the magnetic core when the temperature thereof is increased to a predetermined value, and a protective circuit for stopping the ON/OFF operation of the switching transistor in response to the control signal from the detecting circuit.

REFERENCES:
patent: 3930186 (1975-12-01), Sekiya et al.
patent: 4024437 (1977-05-01), Suzuki
patent: 4087850 (1978-05-01), Koizumi

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