Fault detection circuit for sensing leakage currents between pow

Details Fault detection circuit for sensing leakage currents between pow Fault detection circuit for sensing leakage currents between pow

1994-06-10

1996-01-02

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324509, 324713, 340650, 361 42, G01R 3102

Patent

active

054811945

ABSTRACT:
A fault detection circuit for detecting leakage currents between a DC power source and chassis of an automobile, includes a voltage sensor coupled to the DC power source, the voltage sensor including an analog reference and a chassis ground. A differential amplifier is coupled to the voltage sensor and detects variations in the analog reference and the chassis ground. A voltage comparator unit determines whether the variations detected in the differential amplifier is above a predetermined threshold value. A built-in test circuit tests whether the fault detection circuit is operating correctly.

REFERENCES:
patent: 3737765 (1973-06-01), Lee et al.
patent: 3868566 (1975-02-01), Parsons et al.
patent: 4114622 (1978-09-01), Gonzer
patent: 4398188 (1983-08-01), Feigal et al.
patent: 4809123 (1989-02-01), Allington et al.
patent: 5382946 (1995-01-01), Gale

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