Method for operating an induction hob and induction hob

Abstract

The invention relates to a method for operating an induction hob (), the induction hob () comprising a power circuit portion () with at least one switching element adapted to provide pulsed electric power to an induction coil () and a control entity () for controlling operating parameters of the switching element, the method comprising the steps of: performing a control loop with control cycles in order to detect coupling changes between the induction coil () and a piece of cookware, said control cycles comprising the steps of: o receiving frequency information (f) and power information (P) at said control entity (); o calculating at least one relation coefficient (Ds', Ds″) based on said frequency information (f) and said power information (P); and o comparing said relation coefficient (Ds′, Ds″) with a relation coefficient boundary, thereby de-riving a comparison result; deciding, based on the comparison result, whether to: o perform a new control cycle of said control loop or whether to o stop said control loop and said provision of pulsed electric power to the induction coil () and re-start said control loop after updating an operating parameter of the switching element.