Title: Apparatus for deriving a feedback control signal in a thermal system

Abstract: Power is applied to an electrical element in maintaining a thermal system at stabilized conditions and a feedback signal is derived to control the electrical input to the heating element by linearly combining functions of the current through the heating element and the voltage drop thereacross respectively. In one embodiment, each of the linearly combined functions in the feedback signal can be varied independently to change the stabilized conditions of the thermal system, while in another embodiment a microprocessor is incorporated to provide such variation for a sequential range of stabilized conditions.

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Inventors: Sebens, Carl R. (Stratford, CT, US)
Fisher, III, Chester G. (Southport, CT, US)

Application Number: 772162
Filing Date: 1977-02-25
Publication_date: 1979-07-24
Assignee: The Perkin-Elmer Corporation (Norwalk, CT)
Primary Class(es): 219/497 219/130.33, 219/494, 219/501, 219/504
Other Classes:
US Patent Ref:

RE29441	Oct, 1977	Ericsson	219/135.
3752956	Aug, 1973	Cahill et al.	219/499.
3789190	Jan, 1974	Orosy et al.	219/497.
3896287	Jul, 1975	Cook	219/131.
3924102	Dec, 1975	Hanekom	219/497.
3965396	Jun, 1976	Tyler et al.	219/499.

Other Refs: 24476691210432493778

Apr, 1976	DE
Oct, 1970	GB
Feb, 1976	SU

Primary Examiner: Reynolds, Bruce A.
Assistant Examiner: Paschall, M. H.
Attorney: Giarratana; S. A., Masselle; F. L., Grimes; E. T.