Patent ID: 11917743
Assignee: PANASONIC HOLDINGS CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 14:
15. A method of controlling cooking in an electromagnetic cooking device, the electromagnetic cooking device having a cavity in which a food load is placed and a plurality of RF feeds configured to introduce electromagnetic radiation into the cavity to heat the food load, the method comprising the steps of:
(a) measuring resonances in the cavity;
(b) generating and storing 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 repeating steps (a) and (b) to obtain and store a plurality of resonance maps over time;
(d) detecting a melting state of the food load based on variations between any of the measured efficiencies in the stored resonance maps; and
(e) adjusting a power level of the electromagnetic radiation in response to detection of the melting state.