Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1980-02-15
1982-12-07
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219492, 219494, 219501, 307117, 323242, H05B 102
Patent
active
043629245
ABSTRACT:
A temperature achievement controller for controlling the temperature of a device which is heated by a heating unit in accordance with a predetermined temperature versus time schedule. The controller includes apparatus for producing an analog signal which corresponds to the achieved temperature of the device under test and apparatus for producing an analog signal which corresponds to the desired temperature versus time schedule. An error signal equal to the difference between the achieved and desired temperature is generated and coupled to a three mode control unit which produces a control signal proportional to the sum of the derivative of the error signal, the integral of the error signal and the error signal itself. The control signal is received by a duty cycle modulator which controls the ratio of power on time to power off time of the power applied to the heating unit in accordance with the magnitude of the control signal.
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La Belle John T.
Story Gene F.
Automotive Environmental Systems, Inc.
Paschall M. H.
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