Two stage thermal shutdown

Details Two stage thermal shutdown Two stage thermal shutdown

1980-09-08

1982-08-17

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including protection means

361103, H03F 304, H02H 504

Patent

active

043452183

ABSTRACT:
In an amplifier circuit the output devices are thermally coupled to a shutdown circuit. A first latch is designed to operate at a first high temperature excursion. The first latch operation acts to shut the output devices off and to invoke a second latch. The second latch operates between a low temperature and a second high temperature that is below the first high temperature. Thus, after the first latch operates, the second latch will operate to cycle between a low temperature whereupon it energizes the output devices and a high temperature at which it deenergizes the output devices. By this action, the circuit will permit only one high temperature peak after which it will cycle between a lower high temperature peak and a low temperature. This avoids repeated cycling to a high temperature that could be deleterious to the circuit devices or the package in which they are housed.

REFERENCES:
patent: 4092693 (1978-05-01), Ishikawa

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