Optimisation of DC-link capacitors

Conference: CIPS 2008 - 5th International Conference on Integrated Power Electronics Systems
03/11/2008 - 03/13/2008 at Nuremberg, Germany

Proceedings: CIPS 2008

Pages: 5Language: englishTyp: PDF

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Kriegel, K.; Otto, J. (Siemens AG)
Rackles, J. (Munich University of Applied Sciences)

DC-link capacitors in variable speed drives are used for decoupling the energy source from the output side inverter. Traditionally aluminium electrolytic capacitors are used in the dc-link. New developments of film capacitors however make it possible to use capacitor which are based on this technology too. The economic use of film capacitors implies reduced capacity values and therefore increased ripple voltage. In the paper the parameters which influence voltage ripple in the dc-link of an inverter are analysed.