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Universal serial bus host and power management method thereof

  • US 9,477,288 B2
  • Filed: 09/12/2012
  • Issued: 10/25/2016
  • Est. Priority Date: 12/26/2011
  • Status: Active Grant
First Claim
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1. A universal serial bus (USB) host, comprising:

  • a power unit comprising a battery and a charging module configured to control the battery; and

    a USB interface unit configured to interface with a first USB device,wherein the USB interface unit is configured to be controlled based on a remaining amount of power of the battery, and the USB interface unit is configured to maintain a data connection between the USB interface unit and the first USB device when a power supply connection between the USB interface unit and the first USB device is disconnected,wherein the data connection between the USB interface unit and the first USB device and the power supply connection between the USB interface unit and the first USB device are established via a same USB cable,wherein the USB host is configured to send the first USB device a request of a device type, the device type being information indicating whether the first USB device is a self-powered USB device or a bus-powered USB device,wherein the USB host is configured to operate at one of a first power level, a second power level, and a third power level while in a power saving mode,wherein the power supply connection to the first USB device is interrupted and the data connection to the first USB device is maintained when the first USB device is the self-powered USB device and the USB host is operating at the first or second power level, and the power supply connection and the data connection to the first USB device are interrupted when the first USB device is the self-powered USB device and the USB host is operating at the third power level,wherein the power supply connection and the data connection to the first USB device are maintained when the first USB device is the bus-powered USB device and the USB host is operating at the first power level, and the power supply connection and the data connection to the first USB device are interrupted when the first USB device is the bus-powered USB device and the USB host is operating at the second or third power level.

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