USB HUB and power management method thereof

1. A universal serial bus (USB) HUB, comprising:

a wireless communication module;

a storage module, storing a driver program of the wireless communication module;

a USB interface connected to a host outside of the USB HUB, transferring data with the host;

a HUB controller coupled to the USB interface, the wireless communication module and the storage module, wherein the HUB controller disables the storage module and enables the wireless communication module when the driver program has been installed in the host; and

a power module coupled to the HUB controller, comprising:

a voltage converter coupled to the wireless communication module, converting a power signal from the USB interface to generate a plurality of first powers having different voltage levels to the wireless communication module, wherein the different voltage levels are smaller than the power signal from the USB interface, respectively; and

a power switch coupled to the storage module, generating a second power according to the power signal from the USB interface;

wherein the HUB controller controls the power module not to supply the first powers to the wireless communication module and the second power to the storage module simultaneously.

2. The USB HUB as claimed in claim 1 , wherein the HUB controller does not enable the storage module and the wireless communication module at the same time.

3. The USB HUB as claimed in claim 1 , wherein the HUB controller transmits the driver program to the host when the driver program is not installed in the host, so as to install the driver program in the host.

4. The USB HUB as claimed in claim 1 , wherein the HUB controller controls the power module to supply the first powers to the wireless communication module when the driver program has been installed in the host, so as to enable the wireless communication module.

5. The USB HUB as claimed in claim 1 , wherein the HUB control controls the power module to continuously supply the second power to the storage module when the driver program is not installed in the host, so as to transmit the drive program from the storage module to the host through the USB interface.

6. The USB HUB as claimed in claim 1 , wherein the storage module comprises:

a memory, storing the driver program; and a memory controller, transmitting the driver program from the memory to the host for installation when the driver program is not installed in the host.

7. The USB HUB as claimed in claim 1 , wherein the wireless communication module is a mobile communications module or a wireless local area network (WLAN) module.

8. A power management method for a universal serial bus (USB) HUB connected to a host, wherein the USB HUB comprises a function module and a storage module and the storage module is enabled, comprising:

determining whether a driver program of the function module has been installed in the host; and

disabling the storage module and enabling the function module when the driver program of the function module has been installed in the host,

wherein the step of disabling the storage module and enabling the function module further comprises:

stopping to supply a first power to the storage module, so as to disable the storage module; and

supplying a plurality of second powers to the function module according to a power signal from the host, so as to enable the function module,

wherein the USB HUB further comprises:

a voltage converter coupled to the function module, converting the power signal from the host to generate the second powers having different voltage levels, wherein the different voltage levels are smaller than the power signal from the host, respectively; and

a power switch coupled to the storage module, generating the first power according to the power signal from the host,

wherein the first power supplied to the storage module and the second powers supplied to the function module are not present simultaneously.

9. The power management method as claimed in claim 8 , further comprising:

transmitting the driver program stored in the storage module to the host when the driver program is not installed in the host, so as to install the driver program in the host.

10. The power management method as claimed in claim 8 , wherein the step of transmitting the driver program stored in the storage module to the host further comprises:

continuously supplying the first power to the storage module, so as to transmit the drive program from the storage module to the host.

11. The power management method as claimed in claim 8 , wherein the storage module and the function module are not enabled at the same time.

12. The power management method as claimed in claim 8 , wherein the storage module comprises:

a memory, storing the driver program; and

a memory controller, transmitting the driver program from the memory to the host for installation when it is determined that the driver program is not installed in the host.

13. The power management method as claimed in claim 8 , wherein the function module is a mobile communications module or a wireless local area network (WLAN) module.