CPC H02M 3/155 (2013.01) [H02M 1/08 (2013.01); H02M 5/275 (2013.01); H02M 5/293 (2013.01)] | 19 Claims |
1. A bridge cascade system comprising at least one phase unit and a driving unit for the phase unit, wherein:
the phase unit comprises N bridge topologies cascaded on alternating current AC sides, where N is an integer greater than 1;
the driving unit comprises one driving power supply circuit, a plurality of bootstrap power supply circuits and 2N driving circuits;
in the phase unit, the driving power supply circuit powers the driving circuits directly or through corresponding bootstrap power supply circuits; and
the driving circuits are configured to provide driving signals for corresponding switch transistors in the phase unit.
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