Protective circuit
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United States of America Patent
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Jul 19, 2016
Grant Date -
Nov 5, 2015
app pub date -
Aug 1, 2011
filing date -
Jul 30, 2010
priority date (Note) -
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Abstract
A circuit for protecting an electronic functional unit connected to a data line against positive and negative overvoltages includes an analog switch arranged in the data line before the electronic functional unit and a voltage monitor, which is configured to control the analog switch, wherein the voltage monitor is configured to close the analog switch when no overvoltage occurs and to open the analog switch when an overvoltage occurs. The circuit also functions in an energy-saving mode and/or when no supply voltage is applied. The low resistance and bidirectionality of the data line are maintained.
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