Self-driven synchronous rectification scheme

H - Electricity – 02 – M

Patent

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H02M 3/335 (2006.01)

Patent

CA 2320328

A self-driven synchronous rectifier circuit for a power converter. The circuit comprises a transformer having a secondary winding with a first and second terminal, a first synchronous rectifier coupled to the second transformer terminal and having a control terminal, and a second synchronous rectifier coupled to the first transformer terminal and having a control terminal. The circuit also comprises a first switch couple to the first synchronous rectifier control terminal, and a second switch coupled to the second synchronous rectifier control terminal. The first and second switch are also coupled to the secondary winding. Switching transitions of the first and second synchronous rectifiers are initiated by a polarity reversal of the voltage of the secondary transformer winding.

La présente invention concerne un circuit de redressement synchrone automatique (42) pour convertisseur de courant. Le circuit comprend un transformateur (49, 70) ayant un enroulement secondaire avec une première et une seconde borne, un premier redresseur synchrone (14) couplé à la seconde borne du transformateur et disposant d'une borne de commande, et un second redresseur synchrone (16) couplé à la première borne du transformateur et disposant d'une borne de commande. Le circuit (42) comprend également un premier commutateur (44) couplé à la borne de commande du premier redresseur synchrone (14), et un second commutateur (46) couplé à la borne de commande du second redresseur synchrone (16). Le premier commutateur (44) et le second commutateur (46) sont également couplés à l'enroulement secondaire. Les transitions de commutation du premier redresseur synchrone (14) et du second redresseur synchrone (16) sont initiées par une inversion de polarité de la tension de l'enroulement secondaire du transformateur.

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