Circuit and method for detecting insulation faults

Details Circuit and method for detecting insulation faults Circuit and method for detecting insulation faults

2005-10-04

2005-10-04

Tang, Minh N. (Department: 2829)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

C324S522000, C324S1540PB

Reexamination Certificate

active

06952103

ABSTRACT:
A circuit for monitoring the resistance between the terminals of a battery and a first reference potential has two inputs which are each to be connected to one of the terminals of the battery, and a voltage divider. The voltage devider has two external connections each of which is connected to one of the inputs, and a central connection which is to be connected to the first reference potential. First and second switches are arranged in series in a connection between one of the external connections of the voltage divider and one of the inputs. A measuring instrument is connected to the external connections of the voltage divider, for supplying a monitoring signal which is representative of the voltage between the external connections.

REFERENCES:
patent: 4242631 (1980-12-01), Hall
patent: 4562390 (1985-12-01), Tobise
patent: 5818236 (1998-10-01), Sone et al.
patent: 6731116 (2004-05-01), Yamamoto et al.
patent: 42 03 299 (1992-01-01), None
patent: 196 18 897 (1996-05-01), None
Schutztechnik und Isolationsueberwachung [Protective technology and insulation monitoring], Wolfgang Hofheinz, 6thEdition, VDE, Chapter 14.3.1, pp. 210-215 (no month/year).

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