Temperature sensing protection circuit for IC power chip having

Details Temperature sensing protection circuit for IC power chip having Temperature sensing protection circuit for IC power chip having

1977-03-11

1978-05-30

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

330207P, H02H 504

Patent

active

040926931

ABSTRACT:
A Schmitt trigger circuit including transistors Q12 and Q13 having a common emitter resistor R3 is thermally coupled to a power amplifier A in a monolithic IC chip, and the base of Q12 is biased at a cutoff potential under normal operating conditions. When the temperature rises to a first predetermined level V.sub.BE of Q12 drops below its biasing potential owing to the temperature characteristic of Q12, whereby Q12 conducts, which cuts off Q13 and, through transistor Q14, disables the amplifier. The common emitter feedback provides a thermal hysteresis characteristic, whereby Q12 is not cut off again until the temperature drops below a second predetermined level.

REFERENCES:
patent: 3558987 (1971-01-01), Lewis
patent: 3906310 (1975-09-01), Esashika
patent: 3916263 (1975-10-01), Abbott

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