Electric power converter for DC / DC conversion with dual active bridges.

摘要

The invention relates to a DC active DC / DC converter with dual active bridges and a method for determining a control method for controlling active switching elements in such a converter. A dual active bridge converter has a first bridge circuit (S 11, S 12, S 13, S 14) for converting a first DC voltage into a first AC voltage v 1 (t) and a second bridge circuit (S 21, S 22, S 23, S 24, S 25, S 26, S 27, S 28) for converting a second DC voltage into a second AC voltage v 2 (t). The two AC voltages are applied to an AC voltage intermediate circuit, and the two bridge circuits have controlled switching elements. In this case, at least one of the two bridge circuits is a multi-stage bridge circuit (S 21, S 22, S 23, S 24, S 25, S 26, S 27, S 28), with which the corresponding AC voltage can be generated from successive sections, each with a constant voltage is, wherein at least five different high DC voltages to the corresponding side (Q, P) of the AC intermediate circuit can be applied.