Leakage detection circuit and battery electronic control unit

Details Leakage detection circuit and battery electronic control unit Leakage detection circuit and battery electronic control unit

2007-03-20

2009-12-08

Nguyen, Vincent Q (Department: 2831)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

C324S503000, C361S045000

Reexamination Certificate

active

07629794

ABSTRACT:
A leakage detection circuit includes a branch having a body ground, a protective resistance, a switch element, a detection resistance, and a variable power supply that are coupled in series. A low voltage side of the variable power supply is connected to a negative electrode of a power supply device that is a subject for observation. Under control of the computer, the variable power supply outputs the voltage of 0 (zero) volt for detecting the leakage on a high voltage side and the voltage of 10-odd volts for detecting the leakage on the low voltage side. A leakage current is determined by amplifying a voltage across the detection resistance. A reference potential is not the body ground but the negative electrode of the power supply device, making it possible to configure the circuit in a relatively simply by using one detection circuit with one switch element having high voltage resistance.

REFERENCES:
patent: 7176693 (2007-02-01), Tsuchiya, Naoya
patent: 2003/0155928 (2003-08-01), Roden et al.
patent: 2005/0270034 (2005-12-01), Tsuchiya
patent: 6-153303 (1994-05-01), None
patent: 2002-325302 (2002-11-01), None

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