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This is the typical block diagram of a three-phase AC/AC converter to supply controlled power to a motor. The capacitors used in every main stage are highlighted. A star connection for the EMC filter is typical. The main purpose is to filter interferences coming from and to the grid. The DC-Link block is for smoothing and energy storage. The output IGBTs typically require snubber capacitors to protect the semiconductor from over-voltages provoked by the fast switching. The output filter will minimize the interferences generated by the IGBT module in order to provide the proper load current and voltage.
PTM Published on: 2011-10-27