High efficiency voltage converter and regulator circuit

H - Electricity – 02 – M

Patent

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Details

H02M 7/217 (2006.01) H02M 3/156 (2006.01)

Patent

CA 2197322

A voltage converter and a method for converting AC to DC using an inexpensive circuit having relatively few components. A MOSFET (42, 118) conveys current from a full wave rectifier to charge a capacitor (60) that supplies current to a load (64). In a first embodiment, two transistors (32, 34) are connected as a differential pair to control the voltage applied to the gate of the MOSFET, referenced to a zener voltage developed across zener diode (36) that is connected to the emitters of the two transistors. In a second embodiment, a single transistor controls the voltage applied to the gate of the MOSFET, relative to a zener voltage of a zener diode (132). The MOSFET charges the capacitor while the voltage applied to its gate from the rectified signal is greater than the voltage across the capacitor.

On décrit un convertisseur de tension et un procédé qui permettent de transformer le CA en CC à l'aide d'un circuit peu onéreux comportant relativement peu de composants. Un MOSFET (42, 118) transmet un courant provenant d'un redresseur pleine onde pour charger un condensateur (60) qui fornit du courant à une charge (64). Dans une première variante, deux transistors (32, 34) sont connectés en paire différentielle pour commander la tension appliquée à la porte du MOSFET par référence à une tension Zener produite au travers d'une diode Zener (36) qui est connectée aux émetteurs des deux transistors. Dans une deuxième variante, un seul transistor commande la tension appliqueé à la porte du MOSFET en fonction d'une tension Zener produite par une diode Zener (132). Le MOSFET charge le condensateur tant que la tension appliquée à sa porte depuis le signal redressé dépasse la tension traversant le condensateur.

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