| 摘要 |
A power supply system comprises an electrical power generating device producing DC electrical power in the form of a DC electrical current, a DC current conductor receiving the DC electrical current from the electrical power generating device and carrying the DC electrical current to a socket, and an AC power system transmitting AC electrical current to the socket so that the socket can be accessed by a plug inserted therein to receive the DC current or the AC current from it. The socket has four recesses in it, and each recess has a respective contact therein. Each recess is configured to receive a respective prong and make a respective electrical contact with the plug therein. A first of the contacts transmits the DC current, a second and third of the contacts transmit complementary poles of the AC electrical current, and a fourth contact connects with a grounded connection. A DC-powered electrical device has a plug with a plug body and three prongs supported on and extending from the plug body. The prongs include two AC connection prongs and a ground connection prong corresponding to prongs of a standard three-prong plug. The plug further has a fourth prong supported on the plug body into the socket to contact the DC current recess. The fourth prong is removable from the plug body, or is movably supported on the plug body so that the fourth prong may be removed or moved so that the plug can be plugged into a standard three-recess AC socket.
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