Patent ID: 8773078

Claim:
A universal serial bus (USB) charging system, comprising: a power unit, providing a charging power; and a hub device connected to the power unit, charging at least one chargeable device, the hub device comprising: a plurality of connection ports connected to the at least one chargeable device; and a charging function module coupled to the power unit, distributing a charging current to the connection ports to allow the power unit to provide the charging current to the at least one chargeable device wherein the charging current is greater than a USB protocol current, the charging function module comprising: a charging ability calculator, calculating a chargeable account based on the charging power of the power unit; and a charging port controller, dynamically assigning the connection ports to determine whether one of the connection ports is a chargeable port and to determine whether the chargeable port charges the at least one chargeable device based on the chargeable account; wherein when a charging procedure of the charging system is performed, the hub device detects whether the connection ports are over-current, and if yes, the charging function module adds one to the chargeable account and the connection port provides an operation current to a device for performing a standard USB function wherein the operation current is equal to or smaller than a USB protocol current.