US 10,893,579 B2
Method for operating an induction cooking hob and cooking hob using such method
Carlo Calesella, Castelmassa (IT); Andrea Gallivanoni, Casorate Sempione (IT); Davide Parachini, Cassano Magnago (IT); and Cristiano Vito Pastore, Camerio (IT)
Assigned to Whirlpool Corporation, Benton Harbor, MI (US)
Filed by WHIRLPOOL CORPORATION, Benton Harbor, MI (US)
Filed on Jul. 17, 2018, as Appl. No. 16/37,626.
Claims priority of application No. 17181987 (EP), filed on Jul. 18, 2017.
Prior Publication US 2019/0029079 A1, Jan. 24, 2019
Int. Cl. H05B 6/06 (2006.01); H05B 6/04 (2006.01); H05B 6/12 (2006.01)
CPC H05B 6/065 (2013.01) [H05B 6/1272 (2013.01); H05B 2206/02 (2013.01); H05B 2213/03 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for operating a flexible induction cooking hob comprising a plurality of inductors distributed next to each other to form a bi-dimensional array, said inductors being energizable by a plurality of inverters, a number of said plurality of inductors being underlying inductors overlaid by at least one cooking utensil comprising a common cooking utensil or different cooking utensils, wherein the method comprises the following steps:
assigning a power target value to the at least one cooking utensil, wherein the target power value is distributed among the underlying inductors of plurality of inductors;
obtaining for each of said underlying inductors a target energy or a target power to be delivered;
acquiring for each of said underlying inductors and the one of the inverters configured to energize each of said underlying inductors, a power vs. frequency curve;
defining a predetermined control (Tprog) period shorter than a thermal time constant of at least one of said cooking utensils, and longer than one half-period of a mains power supply;
establishing for each of said underlying inductors, in conjunction with its energizing inverter, a respective operating frequency range defined by said power vs. frequency curve; and
establishing an activation sequence of said inverters in which each of said underlying inductors is configured to be energized with at least a second inductor of said plurality of inductors forming a combination of inductors, wherein:
each of said underlying inductors is configured to deliver said target energy or said target power on average over said control period (Tprog),
said combination of inductor is selected irrespectively of whether each of said underlying inductors, and at least the second inductor are overlaid by the at least one cooking utensil,
each of said underlying inductors and at least said second inductor are provided with the respective operating frequency range, at least partially overlapping, and
said activation sequence has a duration corresponding to said control period (Tprog); and
activating said inverters according to said activation sequence.