Reactive hot wire control apparatus and method responsive to wire thermal expansion and contraction
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United States of America Patent
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Nov 23, 2004
Grant Date -
Mar 25, 2004
app pub date -
Sep 20, 2002
filing date -
Sep 20, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Control system and apparatus for controlling current input to an electrical resistance element such as a seal wire. The system and apparatus of the present invention is a closed loop feedback modification to conventional systems, and takes advantage of the inherent expansion of the seal wire as it is heated. When the seal wire expands to a predetermined length, a switch is triggered which interrupts at least a portion of the power supplied to the wire for heating. The interruption continues until the wire contracts to a length less than the predetermined length, whereupon the interruption ceases and heating of the wire resumes normal operation.
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