Fabrication of PTC heating devices
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United States of America Patent
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May 27, 2003
Grant Date -
N/A
app pub date -
May 4, 2000
filing date -
Sep 3, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and system for fabricating electrical heating devices employing positive temperature coefficient (PTC) thermistor as heating elements which includes: assembling the heating devices with PTC thermistor heating elements preselected according to electrical resistance, applying pressure across the interface between the PTC heating elements and the radiator plates of the heating devices during their assembly, and exposing the heating devices for extended periods of time to both ambient and operational temperatures. The method of fabrication further includes continuously monitoring the electrical resistance of the heating devices and holding their electrical resistance stable by adjusting the pressure applied across the interface between the PTC heating elements and the radiator plates. The system includes a constant temperature chamber for controlling the temperature environment of the heating devices, an ohm-meter circuit for monitoring their electrical resistance, and an adjustable clamping device for adjusting the pressure across the interface between the thermistor heating elements and the radiators of the heating devices.
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