F - Mech Eng,Light,Heat,Weapons – 24 – C
Patent
F - Mech Eng,Light,Heat,Weapons
24
C
327/2.5
F24C 7/02 (2006.01) G05D 23/24 (2006.01) H05B 6/68 (2006.01)
Patent
CA 1130397
VARIABLE POWER AND TEMPERATURE CONTROL SYSTEM FOR A MICROWAVE OVEN ABSTRACT OF THE DISCLOSURE A control system for a microwave oven provides a device for monitoring the temperature within an item being heated with the micro- wave oven, circuitry for detecing when the temperature monitored by the device is greater than a preselected temperature, a control signal generator including circuitry for varying the duty cycle of the control signal for use in varying the amount of heating energy produced in the microwave oven, the circuitry for varying the duty cycle including a variable time constant circuit having a first selectable element for producing a first duty cycle for the control signal and a second selectable element for producing a second duty cycle for the control signal, and a switch controllable by the detecting circuitry for select- ing the first selectable element and thereby the first duty cycle in response to the temperature monitored within the item being below the preselected temperature and for selecting the second selectable element and thereby the second duty cycle in response to the temperature monitored within the item being above the preselected temperature.
313876
Sandler Louis M.
Scott Charles E.
Spofford Walter R.
Mallory (p. R.) & Co. Inc.
Swabey Ogilvy Renault
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