Method and apparatus for supplying auxiliary power to a bus coupled peripheral
AssigneeCypress Semiconductor Corporation
InventorsDavid G. Wright, Jeff Chang
Life of this patent
Estimating the term…
Abstract
A method and apparatus for supplying auxiliary power to a peripheral is disclosed. The method includes supplying power from a first USB port of a host device to an input USB port of a USB hub device, supplying power through a downstream USB port of the USB hub device for use by a downstream USB device, supplying auxiliary power through a power output port of the USB hub device for use by a peripheral device that is coupled to an upstream port and supplying power from a second USB port of the host device to the peripheral device. The power received by the peripheral device is sufficient for its operation.
Claims20
A serial communication hub comprising:
- an input communication port for receiving input power and for receiving and transmitting communication signals;
- a downstream communication port for supplying power to a downstream device and for receiving and transmitting communication signals;
- an upstream power output port;
- and
- a power switch for supplying output power to said power output port, said output power provisioned for a bus-powered peripheral.
A Universal Serial Bus (USB) hub comprising:
- an input USB port for receiving input power from a first USB port of a host device;
- a power output port;
- and
- a power switch for supplying output power to said power output port, said output power provisioned for a bus-powered peripheral and wherein said peripheral is for coupling to a second power output port of said host device that is located upstream.
A method of supplying auxiliary power to a bus-powered peripheral comprising:
- a) supplying power from a first USB port of a host device to an input USB port of a USB hub device;
- b) supplying power through a downstream USB port of said USB hub device for use by a downstream USB device;
- c) supplying auxiliary power through an upstream power output port of said USB hub device for use by a peripheral device that is coupled to said power output port;
- and
- d) supplying power from a second USB port of said host device to said peripheral device, wherein said power received by said peripheral device at said c) and said d) is sufficient for its operation.
Dependencies are inferred from the claim text.