Protective circuit for protecting transistor from thermal destru

Details Protective circuit for protecting transistor from thermal destru Protective circuit for protecting transistor from thermal destru

1994-12-27

1996-08-06

Gaffin, Jeffrey H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361103, 361115, H01L 2900

Patent

active

055439969

ABSTRACT:
An overheat protective circuit includes a first voltage generator generating a first voltage stabilized against a change of an operating temperature, a second voltage generator generating a second voltage changeable in accordance with a change of the operating temperature, a comparator having first and second inputs coupled to receive the first and second voltages, respectively, and a switching circuit responding to a first logic level of the output signal from the comparator to render a transistor to be protected non-conductive. This protective circuit further includes a control circuit which monitors a power voltage and controls, when the power voltage is in a predetermined range, the level at one of the first and second inputs of the comparator such that the comparator outputs its output signal having the second logic level to deactivate the switching circuit.

REFERENCES:
patent: 4698655 (1987-10-01), Schultz

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