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US 11,491,847 B2Granted
Positive temperature coefficient heaters and radiant applications thereof
AssigneeGM Global Technology Operations LLC
InventorsChih-hung Yen, Taeyoung Han, Bahram Khalighi, Kuo-huey Chen, Shailendra Kaushik
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Abstract
A heating apparatus is provided. The heating apparatus includes a positive temperature coefficient (PTC) heating element and a power controller configured to generate and apply a pulse width modified signal to the PTC heating element. The power controller is configured to vary a current of the pulse width modified signal linearly with respect to a temperature of a space being heated by the PTC heating element.
Claims16
A heating apparatus comprising:
- a rolling shade comprising busbars, wherein the rolling shade comprises a sunroof shade integrated in a vehicle roof;
- a positive temperature coefficient (PTC) heating element;
- and
- an insulation layer interposed between an interior facing part of the rolling shade and the PTC heating element;
- wherein the PTC heating element is disposed in between the busbars and on the insulation layer;
- and
- a power controller configured to generate and apply a pulse width modified signal to the PTC heating element;
- wherein the power controller is configured to vary a current of the pulse width modified signal linearly with respect to a temperature of a space being heated by the PTC heating element.
5 more elements
Dependencies are inferred from the claim text.