Electrothermal time proportioning temperature control
Abstract
Abstract APPARATUS CONTROLS A FURNACE OR OTHER HEAT TRANSFER MEANS TO MAINTAIN THE TEMPERATURE IN A GIVEN ZONE SUBSTANTIALLY AT A PRESELECTED LEVEL WHERE THE ZONE IS SUBJECT TO EXCHANGE OF HEAT WITH RESPECT TO AN ENVIRONMENT AT A VARIABLE RATE TENDING TO CAUSE SUBSTANTIAL CHANGE IN TEMPERATURE THEREIN FROM THIS PRESELECTED LEVEL. FIRST AND SECOND THERMISTORS ARE PROVIDED, THE FIRST SENSING THE TEMPERATURE IN THE ZONE AND THE TEMPERATURE OF THE SECOND BEING SUBSTANTIALLY INDEPENDENT OF THE TEMPERATURE IN THE ZONE. A HEATER IS PROVIDED WHICH IS ENERGIZED CONCOMITANTLY WITH ENERGIZATION OF THE FURNACE TO CAUSE HEATING OF THE SECOND THERMISTOR. A SWITCHING CIRCUIT INTERCONNECTED WITH THE THERMISTORS IS OPERATIVE AS MEANS FOR REPETITIVELY ENERGIZING AND DENERGIZING THE FURNACE FOR RESPECTIVE FIRST AND SECOND TIME INTERVALS VARYING AS A FUNCTION OF THE TEMPERATURE IN THE ZONE, THE AVERAGE RATIO OF THE FIRST INTERVAL TO THE TOTAL CYCLE TIME (THE SUM OF THE FIRST AND SECOND INTERVALS) BEING PROPORTIONAL TO THE HEAT EXCHANGE RATE.
Inventors
- 👤 Lyle E Mcbride Jr
Bibliographic Details
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