Opposed current power converter

H - Electricity – 02 – M

Patent

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Details

H02M 7/483 (2007.01) H02M 1/14 (2006.01) H03F 3/217 (2006.01)

Patent

CA 2226818

A power converter includes a pair of switches, each of the switches being connected between positive and negative constant DC voltage sources and a common output node which is connected to a load. A modulator opens and closes the switches in a sequence in which the electrical currents controlled by the switches are in opposition to one another at the common output node, and are summed at the output node. The modulator includes a triangle wave generator and comparators which are connected to an error amplifier to provide a bearing switching voltage to the comparators. The comparators switch the control switches in response to the triangle wave generated by the tiangle wave generator increasing above and decreasing below the reference levels. Underlap and overlap of the converter is controlled by varying of the DC bias level of the triangle wave.

L'invention concerne un convertisseur de courant équipé d'une paire d'interrupteurs établis chacun entre des sources de tensions continues constantes positives et négatives, et d'un noeud de sortie commun relié à une charge. Un modulateur ouvre et ferme les interrupteurs selon une séquence où il se produit une opposition mutuelle, au noeud de sortie commun, des courants électriques commandés par les interrupteurs, et une sommation desdits courants à ce noeud de sortie. Le modulateur comporte un générateur de signaux triangulaires et des comparateurs couplés à un amplificateur d'erreurs dans le but de fournir une tension d'interruption de support aux comparateurs. Les comparateurs activent les interrupteurs de commande en réponse aux signaux triangulaires produits par le générateur sus-mentionné à un niveau supérieur et inférieur par rapport aux niveaux de référence. On régule les phénomènes d'interlignage et de chevauchement propres aux convertisseurs en faisant varier le niveau de la polarisation en courant continu des signaux triangulaires.

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