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US 4,066,867 AGranted
Temperature control circuit with two independent switch outputs
AssigneeRobertshaw Controls Company
InventorJon H. Bechtel
Life of this patent
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Abstract
The invention is a temperature control circuit which time shares a temperature sensor and related circuit elements in order to switch two control signal outputs, each output at one of two preselected temperatures. In a preferred embodiment, the invention is used to control a self-cleaning oven.
Claims16
An electrical temperature control circuit energized from an alternating current voltage supply comprising:
- means for sensing temperature and generating a temperature signal representative thereof;
- means including and for time sharing said temperature sensing means by alternately generating separate setpoint temperature signals representative of two preselected setpoint temperatures during alternate and opposite phases of said alternating current supply voltage;
- comparator means for alternately comparing said temperature signal with each of said setpoint temperature signals during alternate and opposite phases of said alternating current supply voltage and generating an output control signal based on said comparison;
- two control means;
- and
- switching means responsive to said output control signal of said comparator means for alternately and selectively energizing said control means from said alternating current voltage supply.
3 more elements
Dependencies are inferred from the claim text.