Temperature control system for electric surface heater
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United States of America Patent
Stats
-
Jun 9, 1981
Grant Date -
N/A
app pub date -
Sep 17, 1979
filing date -
Sep 15, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A temperature control system for electric surface heater of piled layers of a heating element across which a commercial AC source current is fed and a thermosensitive electrode opposing the element through thermosensitive element showing negative impedance characteristics with temperature rise. In the system, an AC signal voltage different from the source current is applied between the heating element and the thermosensitive electrode, and excessive variations in the signal voltage responsive to the negative impedance of the thermosensitive element is detected to disconnect or connect the heating element and the source.
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