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Temperature Control Circut for Two Heating Devices

  • US 20130264329A1
  • Filed: 04/05/2012
  • Published: 10/10/2013
  • Est. Priority Date: 04/05/2012
  • Status: Active Grant
First Claim
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1. A temperature control circuit for two heating devices, the two heating devices comprising a first heating device and a second heating device;

  • a first heater wire and a first sensing wire being disposed in the first heating device, and a second heater wire and a second sensing wire being disposed in the second heating device;

    the first heater wire and the second heater wire being connected in parallel, and the first sensing wire and the second sensing wire being connected in parallel;

    first ends of the first heater wire and the second heater wire and first ends of the first sensing wire and the second sensing wire being connected with a polarity of an alternating current power source;

    the temperature control circuit comprising;

    a bi-directional thyristor, a first end of the bi-directional thyristor being connected with second ends of the first heater wire and the second heater wire, and a second end of the bi-directional thyristor being connected with another polarity of the alternating current power source;

    a controller connected with second ends of the first sensing wire and the second sensing wire;

    a first node being disposed between the controller and the second ends of the first sensing wire and the second sensing wire;

    the controller comprising a trigger circuit and the trigger circuit being connected with a gate of the bi-directional thyristor so that a controller switch can conduct the alternating current in a way of two half-waves or one half-wave;

    a capacitor coupled with the first node;

    a first diode, a first end of the first diode being connected with the first end of the first sensing wire;

    a second diode, a first end of the second diode being connected with the first end of the second sensing wire, the polarity of the first end of the second diode being opposite to that of the first end of the first diode;

    a third diode, a second end of the third diode being connected with the second end of the first heater wire; and

    a fourth diode, a second end of the fourth diode being connected with the second end of the second heater wire, the polarity of the second end of the fourth diode being opposite to that of the second end of the third diode.

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