Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1991-08-26
1995-03-14
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219501, 219505, 219492, 323235, 323319, H05B 102
Patent
active
053978749
ABSTRACT:
A temperature control circuit is disclosed utilizing automatically either the electric heating (or cooling) element or a separate sensor to measure the instantaneous temperature of the thermal load device. Either a pulsating dc or an ac electric power source may be used with the temperature sensing occurring at near-zero points of the source voltage waveform. The sensor forms one element of a Wheatstone bridge which when unbalanced by a value lower than a chosen reference value, causes a monostable oscillator to flip for at least several cycles of the source power. This turns on a power SCR to feed electric current to the thermal load to increase its temperature (and resistance) until the bridge is again balanced to reverse the state of the monostable oscillator and turn off the SCR. A simple, reliable two step, user friendly calibration circuit is provided for the temperature selecting component. For multiple channel applications the circuit need be reiterated only in part whereby major portions thereof remain common to the various channels and need not be duplicated, thereby minimizing manufacturing cost, component space, heat generation, and power consumption.
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Anderson Daniel T.
Edsyn, Inc.
Paschall Mark H.
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