Overvoltage protection circuit
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United States of America Patent
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Sep 1, 2020
Grant Date -
Jun 21, 2018
app pub date -
May 24, 2016
filing date -
Jun 1, 2015
priority date (Note) -
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Abstract
The present invention relates to an overvoltage protection circuit (1) for protecting the electronics of a motor, in particular of an EC motor, against overvoltage pulses, with two protective devices (FS1, FS2) arranged in series connection between two connections (10, 20), wherein a resistor (R1) or (R2) is connected in parallel to each of the protective devices (FS1, FS2) and at least one capacitive element (C1) is provided in parallel connection to the first protective device (FS1), wherein the overvoltage protection circuit (1) has, between the connections (10, 20), at least a first (lower) and a second (higher) breakdown voltage point at a voltage UZ1 or UZ2 dependent on the voltage change over time k=(dU/dt) of a voltage UGA at the connections (10, 20).
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