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1. (WO2017173082) MICROWAVE HEATING DEVICE AND METHOD FOR OPERATING A MICROWAVE HEATING DEVICE

Pub. No.:    WO/2017/173082    International Application No.:    PCT/US2017/025024
Publication Date: Fri Oct 06 01:59:59 CEST 2017 International Filing Date: Fri Mar 31 01:59:59 CEST 2017
IPC: H05B 6/70
Applicants: ILLINOIS TOOL WORKS INC.
Inventors: BULLO, Marco
LANZA, Nicola
DEMASSARI, Chiara
GAMBATO, Francesco
DUGHIERO, Fabrizio
FLIPOT, Benoît
Title: MICROWAVE HEATING DEVICE AND METHOD FOR OPERATING A MICROWAVE HEATING DEVICE
Abstract:
This disclosure relates to a microwave heating device and a method for operating a microwave heating device, in particular to heat at least one product inside a heating chamber of the device. The microwave heating device comprises at least two radiating portions that are adapted to radiate microwaves to the heating chamber and can be operated according to a plurality of operational configurations that differ in frequency and/or in phase shift(s) between the radiated microwaves. A learning procedure can be executed by sequentially operating the at least two radiating portions in several operational configurations. Energy efficiency data are calculated for those operational configurations. An operating frequency can be selected via an algorithm that optimizes a mathematical function based on energy efficiency data. An operational configuration with a maximum energy efficiency at the selected operating frequency may be taken as a reference. A heating procedure can be executed by sequentially operating the at least two radiating portions in operational configurations having the selected operating frequency and respective phase shift(s) that are chosen around the respective phase shift(s) of the reference operational configuration.