Patent ID: 8817499
Filing Date: 2014-08-26
Classification: H02M

Abstract:
1. A control method to reduce common-mode current in a power converter which comprises: a rectifier stage connected to a number of input phases, an inverter stage connected to a number of output phases, a DC power supply bus linking the rectifier stage to the inverter stage and including a first power supply line and a second power supply line, to each of which is applied an electrical potential, the rectifier stage and the inverter stage each including at least two switching arms connected to the first power supply line and to the second power supply line, first control circuitry to selectively connect, in correspondence with switchover timing, each said input phase of the rectifier stage to one of the first power supply line and the second power supply line, second control circuitry to selectively connect, in correspondence with switchover timing, each said output phase of the inverter stage to one of the first power supply line and the second power supply line, the method comprising: controlling, on each switching period, the rectifier stage and the inverter stage in synchronization with each other so that any variation of potential applied to each said input phase always coincides with a variation of potential of a same sign applied to a corresponding one of the output phases.