INVERTER WITH INTERMEDIATE CIRCUIT CAPACITOR CASCADE AND DC-SIDE COMMON-MODE AND DIFFERENTIAL-MODE FILTERS

摘要

The invention relates to an inverter (1) having an intermediate circuit capacitor, the terminals of which are connected to supply lines (3, 4) for power supply and to a switching device (10) comprising a plurality of half-bridges (13), wherein the intermediate circuit capacitor has a predefined intermediate circuit capacitance (C), the magnitude of which is such that a ripple voltage formed in the supply lines (3, 4) by switching operations in the switching device (10) under predefined operating conditions is reduced to a predefined maximum ripple voltage. In order to reduce differential-mode interference, it is proposed according to the invention that a plurality of parallel-connected intermediate circuit capacitors (11, 12) are provided, wherein the sum of the capacitances (C1, C2) of the plurality of intermediate circuit capacitors (11, 12) corresponds to the intermediate circuit capacitance (C).