Ground-fault detecting device and insulation resistance...

Details Ground-fault detecting device and insulation resistance... Ground-fault detecting device and insulation resistance...

2006-01-10

2006-01-10

Benson, Walter (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

C324S503000, C324S522000

Reexamination Certificate

active

06984988

ABSTRACT:
A ground-fault detecting device includes a power source which is electrically insulated from a vehicle body, a pulse signal generator which generates a pulse signal having a high level and a low level which appear repeatedly in a prescribed cycle, a detection resistor which is connected to the pulse signal generator and the power source, a coupling capacitor which is connected to the detecting resistor in series, an integrator which integrates a difference between a first reference voltage and a detection voltage of the pulse signal at a connecting point of the detection resistor and the coupling capacitor over an integration interval, and a ground-fault determinant which judges whether a ground fault has occurred on the basis of an output of the integrator. The integration interval is at least part of a high-level interval and a low-level interval of the pulse signal.

REFERENCES:
patent: 4180841 (1979-12-01), Engel
patent: 2002/0121902 (2002-09-01), Suzuki
patent: 2933490 (1999-05-01), None

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