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US 6,584,365 B1Granted
Electronic trip device with offset correction means
AssigneeSquare D Company
InventorPierre Blanchard
Life of this patent
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Abstract
An electronic trip device including an analog measuring for measuring electrical signals, analog-to-digital conversion having an input connected to the analog measuring an output having a first output signal, a digital processing means connected to the conversion for performing protection functions, and an offset correction. The offset corrections means are connected to the output of the conversion, and include high-pass digital filtering for computing an output signal value for each sample signal supplied by the conversion, according to an equation.
Claims3
An electronic trip device comprising:
- analog measuring means for measuring electrical signals;
- analog-to-digital conversion means having an input connected to the analog measuring means, and an output point for a first output signal;
- digital processing means connected to the conversion means for performing protection functions;
- and
- offset correction means comprising:
- high-pass digital filtering means connected to the output point of the conversion means for outputting a second output signal;
- and
- means for initialization of the high-pass digital filtering means during an initialization phase, grounding the input point of the conversion means, storing the first output signal from the conversion means and zero resetting the corresponding second output signal from the high-pass digital filtering means.
5 more elements
Dependencies are inferred from the claim text.