Externally-driven scheme for synchronous rectification

Details Externally-driven scheme for synchronous rectification Externally-driven scheme for synchronous rectification

H - Electricity

02

M

H02M 3/335 (2006.01) H02M 1/08 (2006.01)

Patent

CA 2389298

A self-driven synchronous rectifier circuit (50) for a DC-DC power converter. The circuit comprises a primary transformer (16), a first synchronous rectifier (SQ1) coupled to the primary transformer (16), a second synchronous rectifier (SQ2) coupled to the primary transformer (16), an external drive circuit (18). The circuit (50) also comprises a plurality of switches (SQ3, SQ4) controllably coupled to second synchronous rectifier (SQ2). The external drive circuit (18) provides turn-off signaling for both synchronous rectifiers (SQ1, SQ2). Turn-on signaling provided for first synchronous rectifier (SQ1) by the primary transformer (16) turn-on signaling for second synchronous rectifier (SQ2) is provided by the external drive circuit (18).

L'invention concerne un circuit rectificateur synchrone automatique (50) pour convertisseur de puissance continu-continu, qui comprend un transformateur primaire (16), un premier rectificateur synchrone (SQ1) couplé au transformateur primaire (16), un second rectificateur synchrone (SQ2) couplé au transformateur primaire (16), et un circuit de commande externe (18). Le circuit (50) comporte également plusieurs commutateurs (SQ3, SQ4) à couplage contrôlable avec le rectificateur synchrone (SQ2). Le circuit de commande externe (18) assure une signalisation d'arrêt pour les deux rectificateurs synchrones (SQ1, SQ2). La signalisation de lancement est assurée pour le premier rectificateur synchrone (SQ1) via le transformateur primaire (16), tandis que la signalisation de lancement pour le second rectificateur synchrone (SQ2) est assurée via le circuit de commande externe (18).

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