Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication
Reexamination Certificate
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
Benson Walter
Sughrue & Mion, PLLC
Yazaki -Corporation
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