A pulse width modulation power converter

Details A pulse width modulation power converter A pulse width modulation power converter

H - Electricity

02

M

H02M 1/12 (2006.01) H02M 1/00 (2006.01) H02M 7/48 (2006.01)

Patent

CA 2347991

This invention concerns electrical power conversion by utilising pulse width modulation with several carriers (22). The invention can be used with either analog or digital input (21). Numerous advantages can be obtained by intelligent control of the phase shift .THETA.p between the carriers. Hereby a reduction of the high frequency content from the carriers is obtained. Besides of this a common mode free output will be present for special cases (e.g. N=4 and .THETA.p= .pi.). Finally a reduction of the current in the switching devices increases the power handling capabilities.

L'invention concerne une conversion de puissance électrique par modulation d'impulsions en durée, exécutée au moyen de plusieurs porteuses (22). Des entrées (21) analogiques ou numériques sont applicables. Une commande intelligente du décalage de phase .THETA.¿p? entre les porteuses offre plusieurs avantages. Ainsi, à partir des porteuses, on obtient une réduction du contenu haute fréquence. Une sortie exempte de mode commun sera en outre présente pour des cas spéciaux (par exemple N = 4 et .theta.¿p? =.pi.). Enfin, une diminution du courant au niveau des dispositifs de commutation augmente les capacités de traitement de puissance.

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