Charging systems capable of determining the kind of coupled device and related methods thereof

A charging system with a battery, comprising:

• a control unit, coupled to the battery, for detecting that a device is coupled to the charging system, and adjusting charging current to the battery to a level;
• and
• a detection unit, wherein the coupled device provides the charging current through a universal serial bus (USB) interface, the detection unit generates a first voltage when the coupled device comprises the USB interface with two connected data lines, and generates a second voltage when the coupled device comprises the USB interface with two disconnected data lines;
• wherein the control unit adjusts the charging current increasingly from a first level when detecting the first voltage from the detection unit, and adjusts the charging current to a second level when detecting the second voltage from the detection unit;
• wherein the charging current is generated by the coupled device.

A charging system, coupled by a device, comprising:

• a detection unit, for generating a first voltage when the coupled device comprises a universal (USB) interface with two connected data lines, and generating a second voltage when the coupled device comprises the USB interface with two disconnected data lines;
• a battery;
• and
• a control unit, coupling to the detection device and the battery, for adjusting a charging current to the battery, generated by the coupled device, according to the generated first or second voltage;
• wherein after adjusting the charging current according to the generated first voltage, the control unit increases the charging current from the adjusted charging current.