SUPPRESSION OF OVERVOLTAGE CAUSED BY AN INDIRECT LIGHTNING STRIKE
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United States of America Patent
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Issued Date -
Feb 28, 2013
app pub date -
Feb 17, 2011
filing date -
Feb 17, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A coupling circuit for a bus subscriber on a bus line of a field bus with DC-voltage-free and differential EIA-485/EIA-422-compliant signal transmission according to a TTP protocol, in which the two inputs/outputs of a transmission/reception component of the bus subscriber are connected to a first winding of a signal transformer, and the two poles of the bus line are connected to a second winding of the signal transformer, and the first winding has a center tap, wherein the center tap is connected to the local reference-earth potential of the bus subscriber via a capacitor, the capacitance of which is at least 100 times the parasitic capacitance of the transformer.
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