High efficiency off-line linear power supply

H - Electricity – 02 – M

Patent

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Details

H02M 7/21 (2006.01) H02M 1/08 (2006.01) H05B 37/02 (2006.01)

Patent

CA 2528977

A power supply circuit comprising a first switching transistor having a control terminal and a control terminal switching threshold and that charges current from a voltage source into a charge storage capacitor, a control circuit controlling the on/off operation of the switching transistor whereby the switching transistor is turned on when the voltage of the voltage source is below a predetermined level and turned off when the voltage of the voltage source is above the predetermined level, a control voltage supply circuit providing a control voltage to the control terminal of the switching transistor substantially in excess of the switching threshold when the voltage of the voltage source is below the predetermined voltage thereby to drive the switching transistor on in a saturated region of operation; and a charge storage capacitor for providing an output voltage of the power supply.

Circuit d'alimentation électrique comprenant un premier transistor de commutation possédant une borne de contrôle et un seuil de commutation de la borne de contrôle, et chargeant un premier condensateur de stockage en courant électrique provenant d'une source de tension, un circuit de commande commandant la marche et l'arrêt du transistor de commutation, ce qui permet de mettre en marche ce transistor de commutation quand la tension de la source de tension est inférieure à un niveau prédéterminé et de l'arrêter quand la tension de cette source est supérieure à ce niveau prédéterminé, un circuit d'alimentation en tension de contrôle alimentant la borne de contrôle du transistor de commutation en tension de contrôle dépassant sensiblement le seuil de commutation quand la tension de la source de tension est inférieure à la tension prédéterminée, de manière à commander le transistor de commutation dans une zone opérationnelle saturée, ainsi qu'un condensateur-accumulateur de charge servant à produire une tension de sortie de l'alimentation électrique.

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