Method for operating an induction hob and induction hob

A method for operating an induction hob (100), the method comprising the steps of:

• a) providing the induction hob (100) that comprises:
• an inverter (1), which is supplied with a supply voltage (US), at least one capacitor (2, 3), and an induction heating coil (4), wherein the at least one capacitor (2, 3) and the induction heating coil (4) are interconnected such that they constitute an oscillating circuit (5),
• b) generating, via the inverter (1) a pulse-width modulated excitation voltage (UA) for the oscillating circuit (5) from the supply voltage (US), the pulse-width modulated excitation voltage (UA) having a predefined voltage characteristic,
• c) measure a resulting oscillating circuit current (iS),
• d) determine electrical oscillating circuit parameters, according to the voltage characteristic of the pulse-width modulated excitation voltage (UA) and the measured resulting oscillating circuit current (iS),
• e) repeat steps b) to d) n-times each time using a different voltage characteristic of the pulse-width modulated excitation voltage (UA) for the determination of electrical voltage characteristic-dependent oscillating circuit parameters, wherein for variation of the different voltage characteristics of the pulse-width modulated excitation voltage (UA), the supply voltage (US) is varied, and
• f) determine operating variables of the induction hob (100) based on the electrical voltage characteristic-dependent oscillating circuit parameters.