Control of switching devices in synchronized-rectification...

H - Electricity – 02 – M

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H02M 3/00 (2006.01) H02M 3/335 (2006.01)

Patent

CA 2163848

A switch controller in a DC-DC converter performs the switching control of a primary switch and a freewheel switch which are connected to the primary and the secondary of a transformer, respectively. The switch controller comprises a control voltage generator for generating two control voltages havinga predetermined voltage difference, a triangular-wave oscillator for generating a triangular-wave voltage, and a control pulse generator for generating two control pulse signals which cause the primary switch and the freewheel switch to alternately turn on and off such that both the primary switch and the freewheel switch are turned off during a certain period when one of the primary switch andthe freewheel switch is turned off.

La présente invention a pour objet un contrôleur de commutation pour convertisseur c.c. - c.c. pour contrôler un commutateur primaire et un commutateur à roue libre qui sont connectés au primaire et au secondaire d'un transformateur, respectivement. Le contrôleur de commutation en question comporte un générateur de tension de contrôle pour générer deux tensions de contrôle ayant un différentiel de tension prédéterminé, un oscillateur d'ondes triangulaires pour générer une tension à ondes triangulaires, et un générateur d'impulsions de contrôle pour générer deux signaux de contrôle pulsés qui causent l'excitation et la désexcitation alternée du commutateur primaire et du commutateur à roue libre, de telle sorte que l'un et l'autre commutateurs sont alternativement excités et désexcités durant des périodes déterminées.

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