Overvoltage protection circuit
Assigneeebm-papst Mulfingen GmbH & Co.KG
InventorsFabian SCHNEIDER, Daniel KOENIG
Life of this patent
Estimating the term…
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).
Claims10
An overvoltage protection circuit for protecting the electronics of a motor, in particular of an EC motor, against overvoltage pulses, with two protective devices (FS1, FS2) which are 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 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), wherein each protective device (FS1, FS2) has a voltage-dependent resistor and is insulating below a respective protective device-specific breakdown voltage and, respectively, conductive above the corresponding breakdown voltage.
(canceled)
Dependencies are inferred from the claim text.