Universal serial bus current limit

G - Physics – 06 – F

Patent

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G06F 1/26 (2006.01)

Patent

CA 2509026

The embodiments provide for a load device that limits an in-rush current to the load device to be within USB specifications. A load device includes an interface to a universal serial bus, a system bus coupled to the universal serial bus interface for powering electronic circuitry of the load device, a peripheral bus coupled to the universal serial bus interface, and an active switch coupled to the universal serial bus interface and the peripheral bus for applying power to the peripheral bus. The peripheral bus includes an internals capacitance, and the active switch has a switch input for controlling an operational interval of the active switch. The load device also includes a switch controller coupled to the active switch. The switch controller is configured to regulate the in-rush current drawn by the internal capacitance by applying a pulse train to the switch input. The pulse train is predetermined to maintain the instantaneous voltage at the system bus above a predetermined lower limit.

L'article est un dispositif de charge qui limite le courant d'appel au dispositif de charge à un courant conforme aux spécifications USB. Le dispositif de charge comprend ce qui suit : une interface à un bus série universel; un bus système couplé à l'interface bus série universel, pour alimenter les circuits électroniques du dispositif de charge; un bus périphérique couplé à l'interface bus série universel et au bus périphérique, pour appliquer l'alimentation au bus périphérique. Le bus périphérique comprend une capacitance interne et le commutateur actif est doté d'une entrée de commutateur qui commande son intervalle de fonctionnement. Le dispositif de charge comprend aussi une commande de commutation couplée au commutateur actif. La commande de commutation est configurée de façon à réguler le courant d'appel prélevé par la capacitance interne en appliquant un train d'impulsions à l'entrée du commutateur. Le train d'impulsions est prédéfini pour maintenir la tension instantanée au bus système au-dessus d'une limite inférieure prédéterminée.

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