Power protection circuit for transistors

Details Power protection circuit for transistors Power protection circuit for transistors

1980-06-30

1982-10-19

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 86, 330207P, 330298, H02H 326, H02H 720

Patent

active

043553419

ABSTRACT:
A protection circuit which may be used, for example, in an audio amplifier to protect the output drive transistor against conditions of excessive power dissipation. The circuit includes apparatus for monitoring the product of output current and output voltage across the protected transistor and applying a feedback signal to reduce the power dissipation if a predetermined limit is exceeded. Specifically, a representation of the product of the output voltage and output current is obtained by providing a current proportional to each and passing such current through a respective semiconductor junction to produce a logarithmically related voltage. The logarithm of the power product is obtained by summing the logarithmic voltages developed across each respective semiconductor junction.

REFERENCES:
patent: 3577035 (1971-05-01), Constable
patent: 3727148 (1973-04-01), Carver
patent: 3792316 (1974-02-01), Bondini et al.
patent: 3904979 (1975-09-01), Suzuki
patent: 4074334 (1978-02-01), D'Arrigo et al.

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