Control system

Details Control system Control system

1974-08-27

1976-02-10

Envall, Jr., R. N.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219505, H05B 102

Patent

active

039379221

ABSTRACT:
A control system for controlling a condition, such as temperature, to maintain that condition in a generally enclosed space near a selected condition value. The system has a condition responsive impedance in series with a selectable impedance across a regulated voltage source to provide a voltage divider network, the output of which reflects the instantaneous condition of the environmental space relative to a selected condition therefor. This output is supplied to a Schmitt trigger circuit having hysteresis characteristics sufficient to provide a stable operating mode for the control system, and the Schmitt trigger circuit output controls a means for changing the condition of the enclosed space. A manual mode selecting switch may be provided for inserting any of several different impedances in the series combination, and a timer may be provided to automatically switch between different impedances in the series combination as determined by elapsed time with respect to application of power to the circuit.

REFERENCES:
patent: 3452214 (1969-06-01), Martin
patent: 3564205 (1971-02-01), Tyler
patent: 3571564 (1971-03-01), Welch
patent: 3780263 (1973-12-01), Kuzyk
patent: 3818247 (1974-06-01), Chambers et al.
patent: 3858027 (1971-12-01), Phillips
Millman & Taub "Pulse, digital, and switching waveforms" 1965, p. 5.

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