Switching power supply system and process

H - Electricity – 02 – M

Patent

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Details

H02M 7/217 (2006.01) H02M 3/335 (2006.01) H03K 17/0814 (2006.01)

Patent

CA 2202545

A switching power supply system comprises a semiconductor switching device for selectively opening and closing a current path from a dc power source to a load, an inductive component connected in series with the switching device, a series combination of a first diode and a voltage clamp, and a control circuit for controlling the switching device. The series combination is connected in parallel to the switching device or the inductive component such as a transformer or an inductor. The first diode has a carrier lifetime equal to or longer than the switching period of the switching device. A discharge circuit is connected between one terminal of the dc power source and a branch point between the first diode and the voltage clamp, and arranged to regulate an amount of energy returned from the voltage clamp to the dc power source.

Cette invention concerne un système d'alimentation à découpage comportant un dispositif de commutation à semiconducteur destiné à ouvrir et à fermer un circuit entre une source de c.c. et une charge, un élément inducteur raccordé en série au dispositif de commutation, une combinaison série d'une première diode et d'une diode de fixation de niveau, et un circuit de commande du dispositif de commutation. La combinaison série est raccordée en parallèle au dispositif de commutation ou à l'élément inducteur, soit un transformateur ou un inducteur. La première diode a une durée de vie de porteur de charge égale ou supérieure à la période de commutation du dispositif de commutation. Un circuit de décharge est établi entre une des bornes de la source c.c. et un point de branchement entre la première diode et la diode de fixation de niveau; il est monté de façon à réguler la quantité d'énergie renvoyée de la diode de fixation de niveau à la source c.c.

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