Voltage control circuit for a field device coupler
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United States of America Patent
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Aug 22, 2017
Issued Date -
May 19, 2016
app pub date -
Nov 12, 2015
filing date -
Nov 13, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A voltage control circuit for electrically coupling a field device coupler to a bus line. An input voltage (UE) provided at the voltage control circuit by the bus line is converted into an output voltage (UA) that can be regulated and limited. If a current limitation is additionally provided, the “inherent safety” ignition protection type can be achieved. The voltage control circuit has a chopper-type regulator without galvanic isolation. A parallel path is formed parallel to the chopper-type regulator by a series connection of two buffer capacitors. Communication signals of higher frequency can be transmitted past the chopper-type regulator via the parallel path. The parallel path and a reference terminal of the chopper-type regulator are additionally connected via an impedance circuit to a reference potential at a second input terminal of the voltage control circuit.
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