Ground fault detection device

Details Ground fault detection device Ground fault detection device

2006-01-31

2006-01-31

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S509000, C361S042000

Reexamination Certificate

active

06992490

ABSTRACT:
A control section sets a positive side switching element of a positive side detection section and a negative side switching element of a negative side detection section to ON, thus outputting an ON signal. When the switching elements are set ON, a predetermined current outputted from a positive side constant current source and a negative side constant current source, or a portion of this current, flows through detection resistors. A ground fault decision section decides whether a ground fault has occurred in the positive or the negative side of a direct current power source, based upon the value of an output voltage detected by a positive side voltage detector, or upon the value of an output voltage detected by a negative side voltage detector. Ground faults are accurately detected with a simple structure.

REFERENCES:
patent: 4864242 (1989-09-01), Hurley
patent: 2003/0067723 (2003-04-01), Suzui et al.
patent: 4-12616 (1992-01-01), None
patent: 2838462 (1998-12-01), None

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