CPC H05B 6/6447 (2013.01) [H05B 6/686 (2013.01); H05B 6/687 (2013.01); H05B 6/70 (2013.01); H05B 6/707 (2013.01); H05B 6/72 (2013.01)] | 20 Claims |
1. An electromagnetic cooking device comprising:
a cavity in which a food load is placed;
a plurality of RF feeds configured to introduce electromagnetic radiation into the cavity for heating the food load; and
a controller configured to:
(a) measure resonances in the cavity;
(b) generate and store a resonance map resulting from the measured resonances, the resonance map is represented in a frequency/phase domain and includes a plurality of efficiency measurements each taken at different frequencies and phase differences;
(c) conditionally repeat steps (a) and (b) to obtain and store a plurality of resonance maps over time;
(d) detect a melting state of the food load based on variations between any of the measured efficiencies in the stored resonance maps; and
(e) adjust a power level of the electromagnetic radiation in response to detection of the melting state.
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