Thermo-sensitive heater and heater driving circuit
First Claim
1. A thermo-sensitive heater comprising:
- a tubular coating layer with electric insulating characteristics;
a tubular thermistor disposed in the coating layer, having inner and outer surfaces;
a cord-shaped heating element disposed in the thermistor, having inner and outer surfaces;
a center core structure disposed in the form of a wire in the cord-shaped heating element;
a shielding coil connected to a current supplying terminal and disposed in the form of a winding wire around the outer surface of the thermistor;
a first heating coil disposed in the form of a winding wire around the outer surface of the cord-shaped heating element, thus contacting the inner surface of the thermistor; and
a second heating coil disposed in the form of a winding wire around the center core structure, contacting the inner surface of the cord-shaped heating element.
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Accused Products
Abstract
A thermo-sensitive heater and heater driving circuit are disclosed. The thermo-sensitive heater comprises a cord-shaped nylon thermistor that surrounds a heating element, such that the thermistor detects the temperature of the heating element and controls the driving current for a heating coil. Also, the present invention includes electromagnetic shielding material, which is formed by winding an electric conductor around the outer surface of the nylon thermistor, or formed as a wire mesh. This shielding material is advantageous for discharging the electric field radiated from inside of the heater to an external electric field, thus safely eliminating harmful electric fields. Also, the present invention further provides a driving circuit for safely driving the heater, which includes a temperature controller or an overheating prevention circuit.
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Citations
26 Claims
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1. A thermo-sensitive heater comprising:
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a tubular coating layer with electric insulating characteristics;
a tubular thermistor disposed in the coating layer, having inner and outer surfaces;
a cord-shaped heating element disposed in the thermistor, having inner and outer surfaces;
a center core structure disposed in the form of a wire in the cord-shaped heating element;
a shielding coil connected to a current supplying terminal and disposed in the form of a winding wire around the outer surface of the thermistor;
a first heating coil disposed in the form of a winding wire around the outer surface of the cord-shaped heating element, thus contacting the inner surface of the thermistor; and
a second heating coil disposed in the form of a winding wire around the center core structure, contacting the inner surface of the cord-shaped heating element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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12. A thermo-sensitive heater comprising:
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a tubular coating layer with electric insulating characteristics;
a tubular electrical insulation layer disposed in the coating layer, having inner and outer surfaces;
a tubular first layer disposed in the electrical insulation layer, having inner and outer surfaces;
a cord-shaped heating element disposed in the first layer, having inner and outer surfaces;
a core wire disposed in the form of a wire in the cord-shaped heating element;
a first electrode disposed around the outer surface of the cord-shaped heating element and connected to a driving current connection terminal, thus contacting the inner surface of the first layer, for applying a temperature measuring current to the first layer, and for use as a heating element of the cord-shaped heating element;
a second electrode disposed around the first layer, thus contacting the inner surface of the electrical insulation layer, for detecting an electric resistance value of the first layer, which is varied according to the temperature variation of the cord-shaped heating element; and
a first heating coil disposed around the core wire and connected to a driving current connection terminal.
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Specification