Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1995-05-25
1999-06-15
Paschall, Mark
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219504, 219634, 219486, 219553, H05B 102
Patent
active
059118989
ABSTRACT:
The present invention generally relates to use of constant current power supply to control temperatures of a device to plural Curie temperatures, without sacrificing the precision and uniformity of temperature achieved in the known devices. In accordance with exemplary embodiments, multiple layers of alloy having different Curie temperatures are separately accessed as an outer most layer is heated through its Curie point. Power to the device can be controlled by varying a frequency of circulating current and by searching to identify a layer of Curie point material which provides heating at a temperature accurately controlled to a fixed value, where any one of a number of different such temperatures may be selected.
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patent: 4752673 (1988-06-01), Krumme
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patent: 5182427 (1993-01-01), McGafffigan
patent: 5194708 (1993-03-01), Carter, Jr.
patent: 5227597 (1993-07-01), Dickens et al.
Filimon Cristian
Jacobs Stephen M.
Electric Power Research Institute
Paschall Mark
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