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TEMPERATURE CONTROL DEVICE OF ELECTRIC HEATER USING THERMO-SENSITIVE RESIN AND SAFETY DEVICE THEREOF

  • US 20100193503A1
  • Filed: 11/19/2009
  • Published: 08/05/2010
  • Est. Priority Date: 02/02/2009
  • Status: Active Grant
First Claim
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1. A temperature control device of an electric heater using a thermo-sensitive insulation resin, the temperature control device comprising:

  • a heating wire, connected to an alternating current power source though a silicon controlled rectifier (SCR);

    a sensing wire, disposed parallel to the heating wire;

    a thermo-sensitive resin, configured to insulate the heating wire and the sensing wire from each other and change its impedance according to a change in temperature; and

    a temperature sensing unit, configured to output a temperature control signal to turn the SCR on or off according to a change in electric current flowing through the thermo-sensitive resin, the SCR being turned on or off by a sensing unit diode,wherein the heating wire is heated by a heating current that flows in a heating cycle only, in which a forward voltage is formed in the SCR, by the SCR, and the sensing wire conducts a sensing current that flows in a sensing cycle only, in which a reverse voltage is formed in the SCR, by the sensing unit diode.

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