Patent ID: 8530805

Claim:
A method for controlling an induction heating system of a cooking appliance provided with an induction coil and for controlling the induction heating system in connection with a predetermined working condition, the method comprises the steps of: measuring the value of at least one electrical parameter of the induction heating system; feeding a computing model a value representative of an actual switching frequency signal in order to estimate a temperature indicative of a thermal status of the heating system and to provide an estimated value of the electrical parameter; comparing the measured electrical parameter with the estimated one, wherein the electrical parameter is a current circulating in a primary circuit of the induction heating system; and tuning the computing model on the basis of such comparison, wherein the step of tuning the computing model includes the following differential equation: { L P ⁢ ⅆ i p ⅆ t + M ⁢ ⅆ i s ⅆ t + R P ⁢ i p + 1 C ⁢ ∫ i p ⁡ ( τ ) ⁢ ⅆ τ = V I ⁢ ⁢ N ⁡ ( t , f ) M ⁢ ⅆ i p ⅆ t + L s ⁢ ⅆ i s ⅆ t + R s ⁢ i s = 0 R s = R 0 ( 1 + α ⁡ ( T pot - T 0 ) where: C → equivalent capacitance of the primary circuit; R p → equivalent resistance of the primary circuit; L p → equivalent self-inductance of the primary circuit; L s → equivalent self-inductance of a secondary circuit; M → equivalent mutual inductance; R s → equivalent resistance of the secondary circuit; V in → input voltage of the primary circuit; i p → current circulating in the primary circuit; i s → current circulating in the secondary circuit; R 0 → equivalent resistance of the primary circuit when T pot =T 0 ; T pot → Temperature of a pot bottom T 0 → Reference temperature α → A dimensional parameter.