Auxiliary electronic temperature control system for oven
First Claim
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1. An auxiliary temperature control circuit for use in an environment normally under control of a primary temperature control system, said auxiliary temperature control circuit comprising:
- a first comparator circuit, including connection to a first voltage reference;
a second comparator circuit, including connection to a second voltage reference;
a temperature sensor means, including separate connections to said first and to said second comparator circuits, operated in response to temperature changes to generate a variable voltage reference representative of said changes;
a disable circuit, including input circuit connections from said first comparator circuit, and from said second comparator circuit;
and an output circuit connection to a heat generating means, said disable circuit initially operated in response to said first comaprator circuit, said first comparator circuit generating an output signal over said output circuit connection in response to the voltage generated by said temperature sensor means being of approximately the same magnitude as said first voltage reference to render said heat generating means, unoperated.
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Abstract
An auxiliary control system for an oven or similar device that is separate from the primary control circuitry and operates independently when the condition occurs that could be hazardous or unsafe. The control acts to prevent the temperature of a known point to rise above a predetermined set point, or points, and the primary circuitry failed to take corrective action.
10 Citations
12 Claims
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1. An auxiliary temperature control circuit for use in an environment normally under control of a primary temperature control system, said auxiliary temperature control circuit comprising:
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a first comparator circuit, including connection to a first voltage reference; a second comparator circuit, including connection to a second voltage reference; a temperature sensor means, including separate connections to said first and to said second comparator circuits, operated in response to temperature changes to generate a variable voltage reference representative of said changes; a disable circuit, including input circuit connections from said first comparator circuit, and from said second comparator circuit; and an output circuit connection to a heat generating means, said disable circuit initially operated in response to said first comaprator circuit, said first comparator circuit generating an output signal over said output circuit connection in response to the voltage generated by said temperature sensor means being of approximately the same magnitude as said first voltage reference to render said heat generating means, unoperated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification
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Current AssigneeAppliance Control Technology, Inc.
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Original AssigneeAppliance Control Technology, Inc.
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InventorsOppor, Rick L., Braun, Timothy L.
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Primary Examiner(s)Paschall, M. H.
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Application NumberUS07/367,863Time in Patent Office571 DaysField of Search219/441, 219/442, 219/490, 219/494, 219/497, 219/499, 219/501, 219/505, 219/507, 219/508, 219/330, 307/117, 340/584, 340/582, 432/51US Class Current219/497CPC Class CodesG05D 23/24 the sensing element having ...
