Power converter having a voltage link for providing a link voltage (U ZK) for a power unit, which can be driven by a control circuit, for converting electrical energy, which comprises: - a first circuit arrangement having a first voltage divider that is connected to the voltage link and has a first voltage tap for tapping a first partial voltage, said voltage tap being electrically connected to an input of an analogue-to-digital converter for generating a digital voltage value based on the first partial voltage, wherein the voltage link is passively discharged by means of the first voltage divider, wherein an output of the analogue-to-digital converter is connected with the interposition of a first DC-isolating transmission device for transmitting the digital voltage value to the control circuit, wherein the control circuit is configured to determine a first voltage value for the link voltage (U ZK) based on the digital voltage value, - a second circuit arrangement having a second voltage divider that is connected to the voltage link and has a second voltage tap for tapping a second partial voltage, said voltage tap being electrically connected to an input of a voltage/frequency converter for generating a pulse sequence based on the second partial voltage, wherein the voltage link is passively discharged by means of the second voltage divider, wherein an output of the voltage/frequency converter is connected with the interposition of a second DC-isolating transmission device for transmitting the pulse sequence to the control circuit, wherein the control circuit is configured to determine a second voltage value for the link voltage (U ZK) based on the transmitted pulse sequence. - a first circuit arrangement having a first voltage divider that is connected to the voltage link and has a first voltage tap for tapping a first partial voltage, said voltage tap being electrically connected to an input of an analogue-to-digital converter for generating a digital voltage value based on the first partial voltage, wherein the voltage link is passively discharged by means of the first voltage divider, wherein an output of the analogue-to-digital converter is connected with the interposition of a first DC-isolating transmission device for transmitting the digital voltage value to the control circuit, wherein the control circuit is configured to determine a first voltage value for the link voltage (U ZK) based on the digital voltage value, - a second circuit arrangement having a second voltage divider that is connected to the voltage link and has a second voltage tap for tapping a second partial voltage, said voltage tap being electrically connected to an input of a voltage/frequency converter for generating a pulse sequence based on the second partial voltage, wherein the voltage link is passively discharged by means of the second voltage divider, wherein an output of the voltage/frequency converter is connected with the interposition of a second DC-isolating transmission device for transmitting the pulse sequence to the control circuit, wherein the control circuit is configured to determine a second voltage value for the link voltage (U ZK) based on the transmitted pulse sequence.