Apparatus of controlling electric power for electric fusion pipe fitting using conductive polymer composite and method thereof

1. An electric power control apparatus of an electrofusion coupling pipe using a conductive polymer composite as a heating element, comprising:

a resistance-detecting unit configured to detect a resistance variation of the conductive polymer composite based on variation of a voltage and a current when electric power is supplied to the electrofusion coupling pipe; and

an electric power-controlling unit configured to control electric power supplied to the electrofusion coupling pipe according to the resistance variation;

wherein the electric power-controlling unit is configured to divide a time interval when electric power is supplied to the electrofusion coupling pipe into at least two time intervals with reference to the resistance variation of the conductive polymer composite which is recognized by the resistance-detecting unit and then supplies different predetermined electric power in each time interval.

2. The electric power control apparatus of claim 1 , wherein the electric power control apparatus further comprises a diameter-recognizing unit which recognizes a diameter of the electrofusion coupling pipe by using difference in resistance variation of the conductive polymer composite according to a diameter of the electrofusion coupling pipe and the electric power-controlling unit controls supplied electric power according to the diameter of the electrofusion coupling pipe recognized by the diameter-recognizing unit.

3. The electric power control apparatus of claim 1 , wherein the electric power control apparatus further comprises a material-recognizing unit which recognizes a material of the electrofusion coupling pipe by using difference in a resistance value or resistance variation of the conductive polymer composite according to a material of the electrofusion coupling pipe and the electric power-controlling unit controls supplied electric power according to the material of the electrofusion coupling pipe recognized by the material-recognizing unit.

4. The electric power control apparatus of claim 1 , wherein the electric power control apparatus further comprises a temperature-recognizing unit which recognizes an outdoor temperature of the electrofusion coupling pipe by using difference in resistance variation of the conductive polymer composite according to an outdoor temperature of the electrofusion coupling pipe and the electric power-controlling unit controls supplied electric power according to the outdoor temperature of the electrofusion coupling pipe recognized by the temperature-recognizing unit.

5. The electric power control apparatus of claim 1 , wherein the electric power-controlling unit varies current, voltage, or frequency to control supplied electric power.

6. A method of controlling electric power supplied to an electrofusion coupling pipe using a conductive polymer composite as a heating element, comprising:

supplying electric power to the electrofusion coupling pipe;

detecting resistance variation of the conductive polymer composite based on variation of a current and a voltage when the electric power is supplied; and

controlling electric power supplied to the electrofusion coupling pipe on the basis of the resistance variation;

wherein the method of controlling electric power comprises dividing a time interval when electric power is supplied to the electrofusion coupling pipe into at least two time intervals with reference to the resistance variation of the conductive polymer composite, and supplying different predetermined electric power in each time interval.

7. The method of controlling electric power of claim 6 , wherein the method of controlling electric power further comprises recognizing a diameter of the electrofusion coupling pipe by using difference in resistance variation of the conductive polymer composite according to a diameter of the electrofusion coupling pipe; and the controlling of electric power comprises controlling electric power on the basis of the diameter of the electrofusion coupling pipe.

8. The method of controlling electric power of claim 6 , wherein the method of controlling electric power further comprises recognizing a material of the electrofusion coupling pipe by using a resistance value or resistance variation of the conductive polymer composite according to a material of the electrofusion coupling pipe; and the controlling of electric power comprises controlling electric power on the basis of the material of the electrofusion coupling pipe.

9. The method of controlling electric power of claim 6 , wherein the method of controlling electric power further comprises recognizing an outdoor temperature by using difference in resistance variation of the conductive polymer composite according to an outdoor temperature of the electrofusion coupling pipe; and the controlling of electric power comprises controlling electric power on the basis of the outdoor temperature.

10. A method of controlling electric power, comprising:

supplying a first electric power to an electrofusion coupling pipe using a conductive polymer composite as a heating element;

recognizing a diameter of the electrofusion coupling pipe by using a slope of a variation in the resistance of the conductive polymer composite when the first electric power is supplied;

supplying a second electric power corresponding to the recognized diameter of the electrofusion coupling pipe;

recognizing a material of the electrofusion coupling pipe by using information regarding a room temperature resistance value and a maximum resistance value of the conductive polymer composite;

recognizing an outdoor temperature by using difference in time to reach the maximum resistance value of the conductive polymer composite or to reach a resistance value point which is predetermined according to the recognized material past the maximum resistance value point; and

supplying a third electric power corresponding to the material and the outdoor temperature.

11. An electric power control apparatus of an electrofusion coupling pipe using a conductive polymer composite as a heating element, comprising:

a storing unit configured to store information regarding at least two time intervals and information regarding a electric power which is supplied during each of the at least two time intervals; and

an electric power controlling unit configured to control electric power supplied to the electrofusion coupling pipe by providing different electric power in each time interval based on the information stored in the storing unit;

wherein the storing unit is configured to store information regarding a time interval for each material and diameter of an electrofusion coupling pipe and information regarding a magnitude of electric power which is supplied in each time interval; and the electric power controlling unit is configured to recognize from the storing unit information regarding a time interval corresponding to a material and diameter of the electrofusion coupling pipe and information regarding a magnitude of electric power which is supplied in the time interval and then supplies different electric power to the electrofusion coupling pipe in each time interval based on the recognized information.

12. A method of controlling electric power of an electrofusion coupling pipe using a conductive polymer composite as a heating element, the method comprising:

recognizing information regarding at least two time intervals and information regarding a magnitude of electric power which is supplied during each of the at least two time intervals; and

supplying different electric power to the electrofusion coupling pipe in each time interval based on the recognized information;

wherein the recognizing comprises identifying a material and diameter of the electrofusion coupling pipe; and recognizing information regading a time interval corresponding to the material and diameter of the electrofusion coupling pipe and information regarding the magnitude of electric power supplied in each time interval.