Overheat protector for a dc-to-dc converter or the like

Details Overheat protector for a dc-to-dc converter or the like Overheat protector for a dc-to-dc converter or the like

2007-05-08

2007-05-08

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

C361S093100, C361S093800

Reexamination Certificate

active

11056754

ABSTRACT:
A Schottky barrier diode is employed for temperature sensing, being capable of indicating temperatures above 110° C. or so by the magnitude of its reverse current. The overheat protector is disclosed as incorporated in a dc-to-dc converter in which, connected in series with the primary winding of a transformer, a current control switch is driven by a switch control circuit so as to hold the converter output voltage constant. The Schottky barrier diode is connected to the gate of a thyristor, triggering the same by its reverse current when a preselected part of the converter, to which the Schottky barrier diode is thermally coupled, heats up to a predetermined limit. The conduction of the thyristor results in disconnection of the switch control circuit from its power supply.

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