Control of dc/dc converters having synchronous rectifiers

H - Electricity – 02 – M

Patent

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Details

H02M 3/158 (2006.01) H02J 1/10 (2006.01) H02M 1/00 (2006.01)

Patent

CA 2378666

A DC to DC power converter includes synchronous rectifiers which respond to a control waveform. Negative current from a load into the power converter is prevented by increasing the converter output voltage at a minimum current limit. The synchronous rectifiers may be held off in response to decision logic by activation of a hold-off circuit connected to a control terminal of a synchronous rectifier or of an ORing transistor at the converter output. When the synchronous rectifier is subsequently enabled, its control waveform may be increased slowly relative to the switching cycle.

L'invention concerne un convertisseur continu-continu comportant des redresseurs synchrones qui répondent à une forme d'onde de commande. Pour éviter un courant négatif passant d'une charge dans le convertisseur de puissance, on augmente la tension de sortie du convertisseur à une limite de courant minimum. Les redresseurs synchrones peuvent être bloqués en réponse à une logique de décision par activation d'un circuit de blocage connecté à un terminal de commande d'un redresseur synchrone ou d'un transistor OU inclusif au niveau de la sortie du convertisseur. Par la suite, lorsque le redresseur synchrone est activé, sa forme d'onde de commande peut être doucement augmentée par rapport au cycle de commutation.

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