Multilevel power converter

Abstract

To provide a small-sized low-cost multilevel power converter in which a large number of unit converters are connected in series.SOLUTION: A multilevel power converter includes: a main circuit board 10; a capacitor board 13; a unit converter including a switching element S, a cell capacitor Ca, and a gate drive circuit 21; and a positive side converter arm and a negative side converter arm in which unit converters are connected in series. The main circuit board 10 includes the switching element S and the gate drive circuit 21 included in the unit converters. The capacitor board 13 includes the cell capacitor Ca for each unit converter. The main circuit board 10 and the capacitor board 13 are connected in a stacked state.SELECTED DRAWING: Figure 4

Claims

1. A multilevel power converter having a unit converter including a switching element and a cell capacitor, and a converter arm in which a plurality of the unit converters are connected in series, A main circuit board on which switching elements included in multiple unit converters are mounted, A capacitor board on which the cell capacitor is mounted for each of the unit converters, Equipped with, A multilevel power converter characterized in that the main circuit board and the capacitor board are connected in a stacked state.

2. The multilevel power converter according to claim 1, characterized in that the switching element is directly mounted on the mounting surface of the main circuit board.

3. The multilevel power converter according to claim 1 or 2, characterized in that the copper foil thickness of the pattern on the main circuit board is thicker than the copper foil thickness of the pattern on the capacitor board.

4. The multilevel power converter according to claim 1 or 2, characterized in that the number of layers of the main circuit board is greater than the number of layers of the capacitor board.

5. The circuit comprises a gate drive circuit for driving the switching element and a voltage detection circuit for detecting the voltage of the cell capacitor. The multilevel power converter according to claim 1 or 2, characterized in that the gate drive circuit and the voltage detection circuit are mounted on the main circuit board.

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