Multi polymer positive temperature coefficient heater
AssigneeGoodrich Corporation
InventorsNathaniel Ching, Jin Hu, Casey Slane, Galdemir Cezar Botura
Life of this patent
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Abstract
A heating element includes a first bus bar disposed to receive current from a power source, and a second bus bar non-adjacent to the first bus bar. The heating element further includes a polymer ink section extending between the first and second bus bars, and the section includes a plurality of PTC polymer inks each different from one another. The second bus bar is electrically connected to the first bus bar via the polymer ink section.
Claims12
A heating element comprising:
- a first bus bar disposed to receive current from a power source;
- a second bus bar spaced apart from the first bus bar;
- and
- a polymer ink section extending between the first and second bus bars, the section comprising:
- a first PTC polymer ink arranged as a first layer and in physical contact with at least the first bus bar;
- and
- a second PTC polymer ink arranged as a second layer in physical contact with the first layer and at least the second bus bar;
- wherein the first PTC polymer ink has different thermal properties than the second PTC polymer ink;
- wherein the second bus bar is electrically connected to the first bus bar via the polymer ink section.
A method of extending operation of a self-regulating heating element over a greater temperature range, the method comprising:
- disposing a polymer ink section between a first bus bar and a spaced apart second bus bar, the polymer ink section comprising:
- a first PTC polymer ink arranged as a first layer and in physical contact with at least the first bus bar;
- and
- a second PTC polymer ink arranged as a second layer in physical contact with the first layer and at least the second bus bar;
- wherein the first PTC polymer ink has different thermal properties than the second PTC polymer ink;
- and
- electrically connecting the second bus bar to the first bus bar via the polymer ink section.
Dependencies are inferred from the claim text.