CIRCUIT AND METHOD FOR MONITORING A DC LINK CAPACITOR

The invention relates to a device and a method for monitoring a DC link capacitor (CZK) in an electrical DC link of a circuit (1) operated on a mains voltage Vac, the circuit comprising a power factor correction filter (PFC) and an inverter (20), the DC link capacitor (CZK) to be monitored being bet...

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Bibliographische Detailangaben
Hauptverfasser:	SCHROTH, Sebastian, WEINGART, Markus, KERSCHREITER, Andreas
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING
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Beschreibung
Zusammenfassung:	The invention relates to a device and a method for monitoring a DC link capacitor (CZK) in an electrical DC link of a circuit (1) operated on a mains voltage Vac, the circuit comprising a power factor correction filter (PFC) and an inverter (20), the DC link capacitor (CZK) to be monitored being between the power factor correction filter (PFC) and the inverter (20). During the operation of the circuit (1), the DC link capacitance C of the DC link capacitor (CZK) is determined at least at certain time intervals over the operating time by measuring a power ripple W of a DC link voltage VZK, which DC link voltage arises at the DC link capacitor (CZK), said power ripple pulsing at twice the frequency of the mains voltage, and the remaining service life or the service life end and/or usability end of the DC link capacitor (CZK) is determined, by means of an evaluation circuit (30), from the DC link capacitance C determined in this way.