Whirlpool Corporation
Method and device for electromagnetic cooking using closed loop control

Abstract:

An electromagnetic cooking device includes an enclosed cavity, a plurality of RF feeds configured to introduce electromagnetic radiation into the cavity and to measure forward and backward power, and a controller configured to: select a heating target corresponding to an amount of energy that is to be to delivered to each symmetry plane in the cavity; generate a heating strategy based on the heating target to determine a sequence of desired heating patterns, the heating strategy having a selected sequence of resonant modes for energy transfer to the cavity that corresponds to the sequence of desired heating patterns; excite the cavity with a selected set of phasors corresponding to each resonant mode of the selected sequence to create heating patterns; and monitor the created heating patterns to use closed-loop regulation to selectively modify the sequence of resonant modes based on the desired heating patterns.