Electrically heated panel apparatus
First Claim
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1. An electrically heated panel apparatus comprising:
- a heating element having a heating conductor, a fast temperature sensing conductor and a second temperature sensing conductor, said heating conductor, said first temperature sensing conductor and said second temperature sensing conductor being coaxially and integrally formed, said first sensing conductor and said second temperature sensing conductor being separated by a temperature responsive layer with an impedance that varies with temperature, and said heating conductor being separated from said first temperature sensing conductor and said second temperature sensing conductor by an insulating layer; and
a temperature sensing circuit connected to said first temperature sensing conductor and said second temperature sensing conductor for controlling current flowing through said heating conductor in dependence upon a sensed impedance of said temperature responsive layer.
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Abstract
A heating element (2) for an electrically heated panel (22) is provided having a heating conductor (4), a first temperature sensing conductor (6) and a second temperature sensing conductor (8). The first temperature sensing conductor (6) and the second temperature sensing conductor (8) are separated via a layer of material whose impedance varies with temperature. The second temperature sensing connector (8) is straight tinsel conductor whilst the first temperature sensing conductor (6) and the heating conductor (4) are helical wound in opposite senses about the axis of the heating element (2).
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Citations
11 Claims
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1. An electrically heated panel apparatus comprising:
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a heating element having a heating conductor, a fast temperature sensing conductor and a second temperature sensing conductor, said heating conductor, said first temperature sensing conductor and said second temperature sensing conductor being coaxially and integrally formed, said first sensing conductor and said second temperature sensing conductor being separated by a temperature responsive layer with an impedance that varies with temperature, and said heating conductor being separated from said first temperature sensing conductor and said second temperature sensing conductor by an insulating layer; and
a temperature sensing circuit connected to said first temperature sensing conductor and said second temperature sensing conductor for controlling current flowing through said heating conductor in dependence upon a sensed impedance of said temperature responsive layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification