Patent ID: 7505293

Claim:
An electric power converter comprising: a DC power supply comprising a first line of positive voltage, a second line of negative voltage, and a third line of intermediate voltage connected to a first electrode of a plurality of filtering capacitors, a second electrode of said filtering capacitors connected to said first line and said second line, respectively, conversion means having at least three stages connected between at least two of said positive, negative, and intermediate voltage lines, and outputs for supplying at least one output voltage, control means for controlling turn-on of said stages of the conversion means, said control means comprising processing means for supplying composite modulation signals of control signals to said stages, said control means comprising: regulating means for determining a modulation control signal, voltage signal inputs for supplying said regulating means with at least one of (1) signals representative of voltages between at least two of said positive, negative, and intermediate voltage lines, and (2) at least one signal corresponding to a variation in such intermediate voltage, and current signal inputs for supplying said regulating means with current signals representative of output currents of the converter stages, wherein said regulating means determine the modulation control signal according to values of initial modulation signals corresponding to such control signals, according to said signals representative of voltages between at least two of said positive, negative, and intermediate voltage lines, and according to said current signals, and such composite modulation signals correspond to a combination of at least such modulation control signal and such initial modulation signals.