Method and apparatus for implementing soft switching in a...

H - Electricity – 03 – F

Patent

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H03F 3/217 (2006.01)

Patent

CA 2616220

The present invention provides lossless switching by configuring the output inductor so that the ripple current amplitude at load conditions results in small negative current during switching. The reconfigured output inductor results in increased ripple current amplitude. This increased ripple amplitude may be further controlled using zero ripple steering techniques to eliminate ripple at the output capacitor. A ripple steering technique involves adding a secondary output to the class D amplifier which steers the switching ripple away from the main output thus substantially relieving the main output from a major artifact of prior art Class D amplifiers.

La présente invention concerne la réalisation d'une commutation sans perte par configuration de la bobine d'induction de sortie de façon que l'amplitude du courant ondulatoire dans des conditions de charge donne lieu à un petit courant négatif pendant la commutation. La bobine d'induction de sortie reconfigurée donne lieu à une amplitude de courant ondulatoire accrue. Cette amplitude de courant ondulatoire accrue peut en outre être régulée au moyen de techniques de commande pour ondulation nulle destinées à l'élimination de l'ondulation au niveau du condensateur de sortie. Une technique de commande d'ondulation consiste à ajouter une sortie secondaire à l'amplificateur de classe D qui commande l'ondulation de commutation dans le sens opposé à la sortie principale, ce qui permet de débarrasser sensiblement la sortie principale d'un artefact majeur des amplificateurs de classe D antérieurs.

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