Abstract: A hybrid filter circuit for reducing common-mode interference signals with frequencies of at least 150 kHz in a power line with at least one phase. The circuit has a passive filter stage and an active filter unit with an active filter stage. The circuit can be coupled to an electrical device on a load side and to a power supply system on a supply side via the power line. The first active filter stage includes a sensor for measuring a common mode noise signal in the power line and a feedback unit with an active amplifier unit for generating a compensation signal counteracting the common mode noise signal, which is coupled into the power line via an output of the first active filter stage. The passive filter stage and the active filter circuit are arranged in cascade between the load terminal and a supply terminal.

Abstract: A device includes an EMC (electromagnetic compatibility) filter, a frequency converter coupled to the EMC filter, and a motor coupled to the frequency converter via a motor cable. A leakage current compensator includes a leakage current detector and a compensation current generator configured to generate a compensation current that is directed against the leakage current and is overlaid on the leakage current in such a way that the leakage current is reduced.

Abstract: A compensation filter and a method for activating a compensation filter are disclosed. In an embodiment a compensation filter includes an operational amplifier, a capacitive element, a first and a second resistive element and a current converter. The compensation filter is configured to attenuate a common mode interference in a critical frequency range.

Abstract: A compensation filter and a method for activating a compensation filter are disclosed. In an embodiment a compensation filter includes an operational amplifier, a capacitive element, a first and a second resistive element and a current converter. The compensation filter is configured to attenuate a common mode interference in a critical frequency range.

Abstract: A device includes an EMC (electromagnetic compatibility) filter, a frequency converter coupled to the EMC filter, and a motor coupled to the frequency converter via a motor cable. A leakage current compensator includes a leakage current detector and a compensation current generator configured to generate a compensation current that is directed against the leakage current and is overlaid on the leakage current in such a way that the leakage current is reduced.

Abstract: A compensation filter and a method for activating a compensation filter are disclosed. In an embodiment a compensation filter includes a power supply line, an electrical amplifier, an output-coupling circuit between the power supply line and an input of the electrical amplifier, an input-coupling circuit between an output of the amplifier and the power supply line, and a time switch. The time switch is connected in series with the input-coupling circuit between the output of the amplifier and the power supply line.

Abstract: An active compensation circuit is disclosed. In an embodiment a circuit includes a first compensation stage and at least one other compensation stage, wherein each of the first compensation stage and the at least one other compensation stage includes a sensor configured to provide a sensor signal being representative of a current flowing in one or more phases, a controlled current sink configured to supply a compensation current as a function of the sensor signal and an active amplifier element configured to provide a frequency response of an open circuit voltage amplification and/or is to supply a maximal output current, wherein the frequency response differs from a frequency response of at least one other active amplifier and/or wherein the maximal output current differs from a maximal output current of at least one other active amplifier.

Abstract: An active compensation circuit is disclosed. In an embodiment a circuit includes a first compensation stage and at least one other compensation stage, wherein each of the first compensation stage and the at least one other compensation stage includes a sensor configured to provide a sensor signal being representative of a current flowing in one or more phases, a controlled current sink configured to supply a compensation current as a function of the sensor signal and an active amplifier element configured to provide a frequency response of an open circuit voltage amplification and/or is to supply a maximal output current, wherein the frequency response differs from a frequency response of at least one other active amplifier and/or wherein the maximal output current differs from a maximal output current of at least one other active amplifier.