Usb expansion function device
AssigneeNorel Systems Limited
InventorsWei ZHAO, Rui ZHU, Ting WU, Lulu XU, Yuanlong WANG
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Abstract
The present invention discloses a USB expansion function device. When the USB expansion function device with batteries is connected to a mobile terminal device that needs to be charged, by limiting a charging current through a current limiter, a data communication function of the USB expansion function device connected to the mobile terminal device in a USB host mode is implemented while low power consumption of the batteries inside the USB expansion function device is ensured. Thus, the USB expansion function device with batteries can operate continuously for a long time, and its compatibility with data connection of the mobile terminal device can be improved.
Claims6
A USB expansion function device, comprising a USB interface, through which the USB expansion function device is connected to a mobile terminal device, wherein the USB expansion function device further comprises a USB host controller, a battery and charging-discharging controller, and a current limiter,
- the USB host controller is connected to a USB interface data signal and conducts USB data communication with the mobile terminal device, the USB host controller operates in a USB host mode, and the mobile terminal device operates in a USB device mode, and
- the battery and charging-discharging controller supplies power for the USB host controller, and outputs voltage to a USB interface VBUS signal through the current limiter.
Dependencies are inferred from the claim text.