A pulse width modulation device for converting direct...

H - Electricity – 02 – M

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H02M 7/42 (2006.01) H02M 1/12 (2006.01) H02M 7/5395 (2006.01)

Patent

CA 2218937

A device for converting direct voltage into a three phase alternating voltage having a two level converter connected to a direct voltage network and to an alternating voltage network. A control apparatus for performing pulse width modulation determines the pulse width modulation pattern for each phase by comparing a triangular wave for each phase with a reference alternating voltage. The triangular wave is inverted an even number of times during a fundamental oscillation of the reference alternating voltage and the time position of the inversions of each triangular wave is always such that two triangular waves are half a period displaced with respect to the third.

Dispositif permettant de convertir une tension continue en tension alternative triphasée, comprenant un convertisseur à deux niveaux raccordé à un réseau en tension continue et à un réseau en tension alternative. Un équipement de contrôle permettant de moduler la largeur des impulsions détermine le mode de modulation de largeur d'impulsion de chaque phase en comparant l'onde triangulaire de chaque phase à une tension alternative de référence. L'onde triangulaire est ondulée un nombre pair de fois durant une oscillation fondamentale de la tension alternative de référence et la position chronologique des inversions de chaque onde triangulaire est toujours telle que deux ondes triangulaires sont décalées d'une demi-période par rapport à la troisième.

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