Power extension wire

Abstract

A power extension wire includes a power plug, a socket, and a cord connected between the power plug and the socket. The power plug includes a first temperature sensor element, the socket includes at least one alternating-current jack. The cord includes a plurality of alternating-current conducting wires and at least one direct-current conducting wire. When a temperature sensed by the first temperature sensitive element is higher than a first threshold value, the first temperature sensor element transmit a first sense signal to the socket through the at least one direct-current conducting wire.

What is claimed is: 
     
         1 . A power extension wire, comprising:
 a power plug, the power plug has a first temperature sensor element;   a socket, the socket has at least one alternating-current jack; and   a cord connected between the power plug and the socket, the cord has a plurality of alternating-current conducting wires and at least one direct-current conducting wire;   wherein when a temperature sensed by the first temperature sensitive element is higher than a first threshold value, the first temperature sensor element transmit a first sense signal to the socket through the at least one direct-current conducting wire.   
     
     
         2 . The power extension wire according to  claim 1 , wherein the socket cuts-off or displays a warning signal according to the first sense signal. 
     
     
         3 . The power extension wire according to  claim 2 , wherein the cord has a second temperature sensor element for sensing a temperature of the cord, when the temperature is higher than a second threshold value, the second temperature sensor element transmits a second sense signal to the socket, and the socket cuts-off or displays the warning signal according to the second sense signal. 
     
     
         4 . The power extension wire according to  claim 3 , wherein the socket has a control circuit positioned therein, the control circuit detects temperatures of the socket and the cord through the first temperature sensor element and the second temperature sensor element, and the control circuit induces the socket to cut-off or display the warning signal. 
     
     
         5 . The power extension wire according to  claim 4 , wherein the socket has at least one power supplying switch coupled to the control circuit for controlling whether or not the alternating-current socket supplying power.