Temperature control system with simplified controller and power supply
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United States of America Patent
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-
Feb 17, 1987
Grant Date -
N/A
app pub date -
Apr 25, 1983
filing date -
Apr 25, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention includes a simple and inexpensive thermal controller and simple and inexpensive radio frequency alternating current generator which are provided in an improved temperature control system for a resistively heated electrochemical cell. The temperature controller is formed by a single amplifier with feedback circuit which provides the function of a combined deviation amplifier and two mode (percent proportional band and integral functions) controller. The alternating current generator uses a single direct current voltage source to generate a radio frequency alternating electric current. The two elements are combined in a temperature control circuit for a resistively heated electrochemical cell. The control circuit provides an alternating current with varying power by cyclicly shutting the current off for irregular portions of a predetermined cycle period.
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