Switch-mode power supply for a bridged linear amplifier

H - Electricity – 03 – F

Patent

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Details

H03F 1/02 (2006.01) H03F 3/217 (2006.01)

Patent

CA 2175800

A power converter which includes a bridged power amplifier powered from a sole or single DC input power source through a plurality of parallel connected PWM buck converters. The converters are modulated with reference signals which operate in time alternation such that in any conversion cycle there exists a plurality of modulating wave forms which are identical except for their time delays and which are evenly spaced in time over a single conversion cycle. A feedback control amplifier compares the voltage output of the parallel connected converters through the magnitude of the amplifier's required supply voltage and drives the modulating components of the circuit to control the switching duty cycle of each of the individual PWM converters.

L'invention concerne un convertisseur de courant qui comprend un amplificateur de courant en pont alimenté par une seule source de courant continu, par l'intermédiaire d'une pluralité de convertisseurs à modulation de largeur d'impulsion. Les convertisseurs sont modulés par des signaux de référence qui fonctionnent de manière alternée dans le temps, pour que dans tout cycle de conversion, il y ait une pluralité de formes d'ondes de modulation qui sont identiques sauf pour leur délai dans le temps et qui sont également espacées dans le temps sur un seul cycle de conversion. Un amplificateur de commande à contre-réaction compare la tension de sortie des convertisseurs connectés en parallèle à la grandeur de la tension d'alimentation requise par l'amplificateur et commande les éléments modulants du circuit pour assurer la commande du cycle de commutation de chacun des convertisseurs individuels à modulation de largeur d'impulsion.

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