US 11,967,890 B2
Frequency converter
Robin Stahel, Aadorf (CH); and Andreas Burgermeister, Mauren (CH)
Assigned to Lenze SE, Aerzen (DE)
Appl. No. 17/268,772
Filed by Lenze SE, Aerzen (DE)
PCT Filed Aug. 7, 2019, PCT No. PCT/EP2019/071271
§ 371(c)(1), (2) Date Sep. 9, 2021,
PCT Pub. No. WO2020/035381, PCT Pub. Date Feb. 20, 2020.
Claims priority of application No. 10 2018 213 623.8 (DE), filed on Aug. 13, 2018.
Prior Publication US 2021/0399632 A1, Dec. 23, 2021
Int. Cl. H02M 1/00 (2006.01); H02M 5/297 (2006.01)
CPC H02M 1/0009 (2021.05) [H02M 5/297 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A frequency converter, comprising:
at least one bridge arm;
a shunt resistor arranged in the at least one bridge arm;
an evaluation device having an input connection, wherein the evaluation device is designed to evaluate a measurement signal, which is present at the input connection and is dependent on a voltage drop across the shunt resistor, in order to determine a measurement variable; and
a voltage peak suppression device which is designed to short-circuit the input connection of the evaluation device when a voltage peak occurs at the shunt resistor,
wherein the voltage peak suppression device comprises:
at least one switching device which is looped-in between the input connection of the evaluation device and is controlled via a control signal, wherein the switching device short-circuits the input connection of the evaluation device based on a state of the control signal, and
a high-pass filter which generates the control signal based on the voltage drop across the shunt resistor.