Asymmetrical pulse width modulated resonant dc/dc converter

Details Asymmetrical pulse width modulated resonant dc/dc converter Asymmetrical pulse width modulated resonant dc/dc converter

H - Electricity

02

M

H02M 3/335 (2006.01)

Patent

CA 2080027

New topologies for pulse width modulated resonant DC/DC converters are disclosed. The converters include a bridged chopper to convert the DC input to a high frequency AC which in turn is fed to a high frequency transformer whose secondary AC is rectified and filtered to produce a stable DC output. The bridged chopper has at least two semiconductor switches which alternately conduct. The duty cycles of the conduction of the switches are complementary with one another and adjustable to control the stable DC output. A resonant circuit is connected between the chopper and the high frequency transformer and contains a series capacitor, and a series or parallel inductor depending upon the preferred embodiment.

Nouvelles topologies de convertisseurs continu-continu auto-oscillants à modulation d'impulsions en durée. Les convertisseurs comprennent un découpeur ponté pour convertir l'entrée c.c. en c.a. haute fréquence afin d'alimenter un transformateur haute fréquence dont le c.a. secondaire est redressé et filtré pour produire une sortie c.c. stable. Le découpeur ponté a au moins deux commutateurs à semiconducteurs qui passent en conduction alternativement. Les cycles de fonctionnement de la conduction des commutateurs sont complémentaires entre eux et réglables afin d'assurer la commande de la sortie c.c. stable. Un circuit résonnant est connecté entre le découpeur et le transformateur haute fréquence et contient un condensateur série, ainsi qu'un inducteur série ou parallèle selon la version préférée.

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