Patent ID: 7969506
Filing Date: 2011-06-28
Classification: G06F

Abstract:
1. A cradle for connecting to a portable electronic apparatus, comprising: an AC adapter connector used to connect to an AC adapter; a USB connector having a USB_D+ and a USB_D− contact for connecting to a USB interface of a computer; a mini USB plug used to connect to the portable electronic apparatus; a USB signal detecting circuit, which detects the USB_D+ and the USB_D− contact of the USB connector to determine whether the computer is in an operating state where timing on the USB_D+ and the USB_D− contact of the USB connector has a specific variation or a suspended state where timing on the USB_D+ and the USB_D− contact of the USB connector has no specific variation; and a switch coupled between the USB D+ contact of the USB connector and a USB D+ contact of the mini USB plug, so that when the computer is suspended, the switch disconnects and the USB D+ contact of the USB connector is maintained at a high potential level via another switch; wherein when the computer is suspended from the operating state, the portable electronic apparatus is charged directly by the AC adapter via the mini USB plug and the AC adapter connector and establishes no USB connection with the computer, and when the computer resumes its operating state from the suspended state, the portable electronic apparatus automatically reestablishes the USB connection with the computer without having to physically reconnect the USB connector.