Patent ID: 7499296
Filing Date: 2009-03-03
Classification: H02M

Abstract:
1. An electric power converter device with control means for controlling semiconductor stages of the electric power converter, said electric power converter comprising: rectifying means for receiving an input electric voltage or current and for supplying a DC voltage on intermediate DC voltage lines, DC voltage filtering means connected to the intermediate lines, conversion means for converting said DC voltage into output AC voltages, said conversion means having at least two stages connected between said DC voltage lines and outputs, a common neutral or earth conductor connected between the input and at least one of said outputs, a common stage comprising electronic power components connected between said intermediate DC voltage lines and said common neutral conductor, and said control means for controlling said at least two stages of the conversion means and said common stage, said control means comprising processing means, said processing means for outputting an over-modulation control signal for over-modulating at least said common stage of said electric power converter, wherein said processing means are for receiving control signals corresponding to the at least two stages of the conversion means and said common stage, applying a reference voltage to said control signals, modulating said control signals, and outputting modulated control signals to said at least two stages of the conversion means, said processing means are for outputting a signal for controlling said common stage, said signal for controlling said common stage being based on said reference voltage and said over-modulation control signal, and the reference voltage has a value between voltage values of the respective intermediate DC voltage lines.