Pulse width modulated voltage regulator-converter/power converter having push-push regulator-converter means
High temperature electrochemical cell tester
Solid electrolyte oxygen sensor with integral heater
Solid state sensor for anhydrides
High selectivity plasma etching method
Universal temperature control circuits
Oxygen concentration detector and a method of detecting oxygen concentration
Oxygen sensor with heater
ApplicationNo. 06/488371 filed on 04/25/1983
US Classes:219/501, Including semiconductor means (e.g., transistor)204/400, Analysis and testing219/497, Comprising voltage and/or current measuring and comparing or combining means323/245, With nonelectrical condition sensing330/103, Multiple feedback paths330/75SIGNAL FEEDBACK
ExaminersPrimary: Paschall, Mark H.
Attorney, Agent or Firm
International ClassesG05D 23/20 (20060101)
G01N 27/406 (20060101)
AbstractThe 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.