Method and device for reducing harmonics in power converters

Details Method and device for reducing harmonics in power converters Method and device for reducing harmonics in power converters

H - Electricity

02

M

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

Patent

CA 2403142

The invention concerns multistage power switching electronic device for reducing undesirable harmonics amplitudes generated in said device, in particular in the form of beats, comprising at least an input filter (1), a rheostatic braking chopper (2) including at least two switches (Fr1, Fr2) and mutlilevel static converter (4) including at least four switches in series (T1, T2, T3, T4). The invention is characterised in that the oscillator (4) is directly attached to the chopper (2) providing a connection by their midpoint (X = X') and it comprises a variable random frequency pulse generator controlling the switches of said chopper (2).

La présente invention se rapporte à un dispositif électronique de commutation de puissance à plusieurs étages permettant de réduire les amplitudes des harmoniques indésirables générés dans ledit dispositif, en particulier sous forme de battement, comprenant au moins un filtre d'entrée (1), un hacheur de freinage rhéostatique (2) comprenant au moins deux commutateurs (Fr1, Fr2) et un onduleur multiniveaux (4) comprenant au moins quatre commutateurs en série (T1, T2, T3, T4), caractérisé en ce que l'onduleur (4) est directement accolé au hacheur (2) en prévoyant une liaison par leur point milieu (X = X') et en ce qu'il comprend un générateur d'impulsions de fréquence aléatoire variable commandant les commutateurs dudit hacheur (2).

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