Patent ID: 8212406

Claim:
A power supply system comprising: 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, said DC current conductor carrying said DC electrical current to a socket; and an AC power system transmitting AC electrical current to the socket so that said socket can be accessed by a plug inserted therein to receive therefrom the DC current or the AC current wherein the socket has four recesses therein, each recess having only one respective contact therein and being configured to receive a respective prong, and to make a respective electrical contact with said prong therein, a first of said contacts transmitting the DC current, a second and third of said contacts transmitting complementary poles of the AC electrical current, and a fourth contact connecting with a grounded connection; and wherein the recess with the contact providing the DC current supplies solely a single line of said DC current therein, such that a DC circuit may be formed between said single line of DC current and a prong asserted into the recess having the fourth contact.