Universal serial bus host and power management method thereof
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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Abstract
A universal serial bus (USB) host includes a power unit and a USB interface unit. The power unit includes a battery and a charging module configured to control the battery. The USB interface unit is configured to interface with a first USB device, and is configured to be controlled based on a remaining amount of power of the battery. The USB interface unit is further 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.
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Citations
20 Claims
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1. A universal serial bus (USB) host, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A universal serial bus (USB) host, comprising:
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a power unit comprising a battery and a charging module configured to control the battery; and a USB interface unit configured to interface with at least one 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 separately control a power supply line connected to the USB interface unit and the at least one USB device, and a data communication line connected to the USB interface unit and the at least one USB device, wherein the power supply line and the data communication line are included in a same USB cable, wherein the USB host is configured to send the at least one USB device a request of a device type, the device type being information indicating whether the at least one 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 a power supply connection to the at least one USB device is interrupted and a data connection to the at least one USB device is maintained when the at least one 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 at least one USB device are interrupted when the at least one 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 at least one USB device are maintained when the at least one 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 at least one USB device are interrupted when the at least one USB device is the bus-powered USB device and the USB host is operating at the second or third power level. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A universal serial bus (USB) power management method, comprising:
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connecting a USB device to a USB host, wherein the USB host comprises a battery; determining a remaining amount of power of the battery; setting an operation mode of the USB host to a normal mode upon determining that the remaining amount of power is greater than a first power threshold; setting the operation mode of the USB host to a power saving mode upon determining that the remaining amount of power is less than or equal to the first power threshold and greater than a second power threshold; and setting the operation mode of the USB host to a power charging mode upon determining that the remaining amount of power is less than the second power threshold, wherein the USB host communicates data with the USB device and supplies power to the USB device while in the normal mode, and the USB host communicates data with the USB device and receives power from the USB device while in the power charging mode, wherein the USB host operates at one of a first power level, a second power level, and a third power level while in the power saving mode, wherein a power supply connection to the USB device is interrupted and a data connection to the USB device is maintained when the USB device is a 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 USB device are interrupted when the 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 USB device are maintained when the USB device is a 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 USB device are interrupted when the USB device is the bus-powered USB device and the USB host is operating at the second or third power level. - View Dependent Claims (20)
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Specification