Isolated DC fault current sensor

Details Isolated DC fault current sensor Isolated DC fault current sensor

1995-07-31

1997-03-11

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324537, 324127, 361 91, G01R 3100, H02H 3087

Patent

active

056105320

ABSTRACT:
A device for detecting the occurrence of a dc current fault in the dc feed bus of a solid state power inverter bridge. The device uses a standard, available dc shunt which is connected in the dc feed bus and which produces an ac component in its output as well as dc as a result of the PWM action of the inverter bridge. An isolation transformer and an absolute value detector process the shunt output signal and present the resulting dc signal to a digital comparator after being summed with a voltage trip level. The comparator will output a low signal indicating a fault current if the instantaneous dc component connected from the isolation transformer is higher than the comparator input trip level. The fault detection action of the invention sensor is virtually instantaneous and can be used to shut down the solid state switches in the bridge and protect them from possible damage.

REFERENCES:
patent: 4251766 (1981-02-01), Souillard
patent: 4553187 (1985-11-01), Burns et al.
patent: 5404094 (1995-04-01), Green et al.

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