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 22.07.2012   Con USB Power Delivery un connettore USB eroga fino a 100W
 

Il consorzio USB 3.0 Promoter Group, in collaborazione con l'USB 2.0 Promoter Group, ha annunciato il completamento della definizione della specifica USB Power Delivery, con la quale viene evoluto lo standard USB dal punto di vista del dimensionamento della potenza elettrica fornita dall'host alle device.

In estrema sintesi, USB Power Delivery, pur essendo compatibile all'indietro con l'attuale specifica USB Battery Charging 1.2, guida l'implementazione di connessioni USB in grado di lavorare con tensioni in gioco più alte (il valore supportato dai prodotti oggi in commercio è pari a 5V, ndr), tali da garantire una erogazione di potenza che può raggiungere la soglia dei 100W.

Per cogliere in pieno la portata della miglioria, si consideri che l'attuale implementazione di USB 3.0 supporta l'erogazione di una potenza massima pari a 4.5W (la tecnologia equivalente di Intel, Thunderbolt, sebbene sia più potente in questo senso, non supera tuttavia i 10W, ndr).

USB Power Delivery è quindi destinata ad ampliare notevolmente il set di device alimentabili e le funzionalità offerte dai connettori USB in termini di alimentazione: la nuova specifica rende possibile, infatti, l'alimentazione di sistemi più complessi, come notebook, tablet e hard drive esterni di grandi dimensioni, con l'ausilio di una singola porta USB. Simultaneamente, riduce sensibilmente il tempo di ricarica dei dispositivi, come gli smartphone, già supportati dall'attuale specifica USB Battery Charging 1.2.

USB Power Delivery richiede l'utilizzo di cavi certificati per la nuova specifica.



The USB 3.0 Promoter Group, in conjunction with the USB 2.0 Promoter Group, today announced the completion of the USB Power Delivery specification, which enables increased power delivery through USB cables and connectors. The specification expands cable bus power capabilities in USB applications, supplying higher voltage and current to deliver power up to 100 watts over USB Power Delivery certified cables. It is capable of delivering higher power to charge notebook PCs and power external hard-disk drives, devices which previously did not receive adequate power from traditional 5V bus power.

The USB Power Delivery specification enables a switchable source of power without changing cable direction. Existing USB cables and connectors are also compatible with this specification and will coexist with the USB Battery Charging 1.2 specification as well as existing USB-bus powered applications.

"USB Power Delivery enables a path to greatly reduce electronic waste by eliminating proprietary, platform-specific chargers," said Brad Saunders, USB 3.0 Promoter Group Chairman. "We envision a significant move toward universal charging based on this specification, most notably for charging notebook PCs using standardized USB power bricks or when connected to USB hubs and desktop displays that integrate USB Power Delivery capabilities."

"The publication of the USB Power Delivery specification is an important step in enabling a flexible, standardized power management ecosystem," said Peter Harrison, Director, Standards Collaboration, Nokia.

"We believe USB Power Delivery is the next big step in the USB evolution to provide high bandwidth data and intelligent power over a simple, single, ubiquitous cable," said Robert Hollingsworth, Senior Vice President and General Manager of the USB Products Group at SMSC. "USB has always combined data and power over a single cable, and this is widely believed to be a major contributor to the present ubiquity of USB. USB Power Delivery builds on that success and adds full bi-directional power that can be renegotiated as system power needs change with the end-user."

The USB 2.0 and 3.0 Promoter Groups developed the USB Power Delivery specification and have transitioned the specification's management to the USB-IF. The USB Promoter Groups are now accepting adopters of the USB Power Delivery specification. To download both the USB Power Delivery





Source: USB 3.0 Promoter Group Press Release
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Tags: 100w  |  alimentazione  |  connettore usb  |  potenza elettrica  |  usb  |  usb 3.0 promoter group  |  usb power delivery

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