Generation of a diagnostic signal when the current through a pow

Details Generation of a diagnostic signal when the current through a pow Generation of a diagnostic signal when the current through a pow

1994-07-08

1997-04-01

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327312, 327327, 327513, H03K 19082

Patent

active

056170467

ABSTRACT:
A diagnostic signal, indicative of the reaching of a predefined level, lower than a fixed maximum limit value, by the current flowing through a power transistor, is generated while employing a single comparator of a reference voltage with the voltage present across a sensing resistance, thus preventing problems arising from different offset characteristics of distinct comparators. By the use of current mirrors, the generation of a diagnostic signal when the current reaches a level that can be fixed very close to the maximum limit value, may be reliably triggered, irrespectively of the offset characteristic of the single comparator employed.

REFERENCES:
patent: T957008 (1977-04-01), Sheng
patent: 4914317 (1990-04-01), Agiman
patent: 4914357 (1990-04-01), Valley
patent: 5168209 (1992-12-01), Thiel
patent: 5424665 (1995-06-01), Sueri et al.
patent: 5459425 (1995-10-01), Yasuda

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