Reactive hot wire control apparatus and method

Details Reactive hot wire control apparatus and method Reactive hot wire control apparatus and method

G - Physics

05

D

G05D 23/02 (2006.01) B29C 65/22 (2006.01) G05D 23/275 (2006.01) H05B 1/02 (2006.01) H05B 3/00 (2006.01)

Patent

CA 2437682

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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