US Patent 7123475 AC/DC adapter and notebook computer using the same

An AC/DC adapter having a main body for converting AC power into DC power and a DC power cable connected to the adapter main body. A power supplying jack is provided at an end of the DC power cable and connected to a connection port of one of a plurality of electronic devices constituting an electronic system to supply DC power therethrough. At least one grounding cable branches off from the DC power cable and forms a grounding path. A grounding jack is provided at an end of the grounding cable and is connected to a connection port of another electronic device of the plurality of the electronic devices to connect the grounding cable and a grounding area of the another electronic device of the plurality of the electronic devices.