Adaptive Observers Applied to Pan Temperature Control of Induction Hobs

In this paper, a pan temperature control of induction hobs is described. The aim is that the user may select the cooking temperature instead of the power for the cooker. Pan temperature has to be estimated from a thermal sensor placed under the ceramic glass. Heat transmission from the induction coil to the pan and from the pan to the thermal sensor is modeled using a state-space model. As induction heating is highly dependent on thermal and magnetic pan properties, two different adaptive schemes are proposed and compared. Both guarantee a proper closed loop behavior. The contribution of this paper is related with temperature adaptive observer for different pans. The resultant system is simple, user friendly, robust, and safe, and is used for automatic cooking.