Apparatus and method for measuring the insulation resistance...

Details Apparatus and method for measuring the insulation resistance... Apparatus and method for measuring the insulation resistance...

2008-01-08

2008-01-08

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C429S010000

Reexamination Certificate

active

11170093

ABSTRACT:
A measuring device to measure the insulation resistance (Riso) of a fuel cell system with respect to an electrical ground point comprises a resistor arrangement—formed by a series connection of reference resistors—between two load-current lines of the fuel cell system as well as one reference voltage source, which is arranged between the ground point and a node between the reference resistors and which is switchable between at least two different reference voltages (Urefo, Urefu). The measuring device further comprises one voltage-sensing device that acquires the voltage (Uo, Uu) between at least one of the load-current lines and the ground point. Connected to the voltage-sensing device is an evaluation unit, which determines the insulation resistance (Riso) on the basis of a first voltage value, which represents a value of the voltage between a first of the load-current lines and the ground point while a first reference voltage (Urefo) of the reference voltage source is applied, and on the basis of a second voltage value, which represents the value of the voltage between the first load-current line and the ground point while a second reference voltage (Urefu) of the reference voltage source is applied.

REFERENCES:
patent: 5760488 (1998-06-01), Sonntag
patent: 5818236 (1998-10-01), Sone et al.
patent: 6864688 (2005-03-01), Beutelschiess et al.
patent: 6952103 (2005-10-01), Herb et al.
patent: 7079406 (2006-07-01), Kurokami et al.
patent: 2004/0189330 (2004-09-01), Herb et al.

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