H - Electricity – 02 – H
Patent
H - Electricity
02
H
321/29
H02H 7/12 (2006.01) H01F 38/02 (2006.01) H02H 5/04 (2006.01) H02M 3/335 (2006.01)
Patent
CA 1107349
ABSTRACT OF THE DISCLOSURE A protective circuit for a switching regulator in- cludes a DC voltage source having a pair of terminals, a trans- former 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. -1-
312643
Gowling Lafleur Henderson Llp
Sony Corporation
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