Method and voltage converter for converting a d.c. input...

Details Method and voltage converter for converting a d.c. input... Method and voltage converter for converting a d.c. input...

H - Electricity

02

M

H02M 7/48 (2007.01) H02M 7/501 (2007.01)

Patent

CA 2443505

The invention relates to a method for generating, from a DC input voltage (UE), an AC voltage (UA) in the system frequency range, which method is characterized in that two opposite-pole, pulse-width modulated rectangular pulses (a, b) having a high switching rate are applied to the primary winding (W1) of a transmitter (UET), every pulse being modulated corresponding to a half-wave of the AC voltage to be generated. On the secondary side, the impulses of both pulses are rectified so that only one pulse (d) from impulses of one polarity remains which due to their pulse width modulation correspond to subsequent half-waves of the AC voltage to be generated. The pulse so obtained is periodically commutated with the double frequency of the AC voltage to be generated so that a pulse (e) is obtained that is pulse-width modulated with respect to amplitude, frequency and polarity of the AC output voltage.

Selon l'invention, pour produire une tension alternative (U¿A?) dans la page de fréquence du réseau, à partir d'une tension continue d'entrée (U¿E?), deux impulsions carrées (a, b) à haute fréquence de commutation, anti-polaires et modulées en largueur sont appliquées à l'enroulement primaire (W1) d'un transformateur (UET), chacune de ces impulsions correspondant à une demi-onde de la tension alternative à produire. Sur le côté secondaire, chacune des deux impulsions est démodulée, de telle sorte qu'il ne reste plus qu'une impulsion (d) faisant partie des impulsions d'une certaine polarité qui correspondent, étant donné leur modulation en largeur, à des demi-ondes se succédant de la tension alternative à produire, et l'impulsion obtenue est, périodiquement avec la fréquence doublée de la tension alternative à produire, inversée en polarisation, de telle sorte que l'on obtient une impulsion (e) qui, en ce qui concerne l'amplitude, la fréquence et la polarité de la tension alternative de sortie, est modulée en largeur.

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