Patent ID: 7883358

Claim:
A connection-sensing DC plug comprising: an insulative body having a bottom opening and a chamber communicating with the bottom opening; a hollow connecting portion and cylindrical and comprising an internal power layer, an intermediate isolation layer and an outer ground layer, and having a first end mounted in the insulative body; and a second end protruding from the insulative body; two power terminals mounted in the insulative body, held in the chamber and respectively contacting the internal power layer and the outer ground layer of the connecting portion; a conductive sheet mounted in the chamber and selectively contacting the outer ground layer in a normal state and turning into a floating state when the conductive sheet is pushed; a retractable pin movably and partially mounted in the insulative body parallel to the connecting portion and having a first end extending into the chamber of the insulative body and engaging the conductive sheet; and a second end protruding from the insulative body.