Short circuit detection in particular for a measuring bridge

Details Short circuit detection in particular for a measuring bridge Short circuit detection in particular for a measuring bridge

1998-08-18

2000-09-12

Metjahic, Safet

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324706, G01R 3108

Patent

active

061182788

ABSTRACT:
According to the invention, an AC-signal is superimposed to a signal on the two lines to be monitored. A signal difference between the signals on each line is compared with the superimposed AC-signal. A short circuit between the two lines to be monitored can thus be detected when the superimposed AC-signal is not present in the signal difference. The frequency of the AC-signal is preferably selected as half of the sampling frequency of a subsequent sampling means. In a measuring bridge, the short circuit detection unit is coupled to a first and a second measuring point of the bridge.

REFERENCES:
patent: 4045734 (1977-08-01), Cox et al.
patent: 4378579 (1983-03-01), Hudon
patent: 4785236 (1988-11-01), Balogh et al.
patent: 5440234 (1995-08-01), Kondo
patent: 5734269 (1998-03-01), Sakai et al.
Figure 1 of application #09/135,807 applied by Rother, Aug. 18, 1998.

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