Influence of DMC EMI Optimization on CMC EMI for DC-AC Isolated Power Converter Array.

Inhalt:
This paper focuses on the EMC disturbances generated by converter networks (PCA). After recalling the interest of the interleaving for the reduction of the differential mode current (DMC), the impact of the interleaving strategy on the common mode current (CMC) is studied. For this purpose, a PCA model allowing the evaluation of the CMC is proposed. This model, confronted with measurements carried out on a prototype PCA, has shown its good accuracy. Based on this model, several interleaving strategies of the PCA converters are evaluated according to the conducted EMC disturbances they generate. The interleaved control strategies are therefore studied according to their induced CMC but also according to the impact they have on the DMC. The work is based on simulations and modelling of a multi-stage DC-AC converter. The modelling of the CMC sources as voltage hotspots exploited by the interleavedcontrol strategy is developed. An analysis is performed to highlight the opportunity of common moderecycling at the multistage converter and ends with the presentation of a control strategy allowing CMCrecycling inside the PCA.