Method for Heating a Liquid in a Cooking Vessel and Induction Heating Device

A method for heating a liquid, which is contained in a cooking vessel, utilizing an induction heating device, the method comprising:

• continuously determining a parameter value of a resonant circuit of the induction heating device, the resonant circuit comprising an induction heating coil, wherein the parameter value comprises a period duration of a naturally resonant oscillation of the resonant circuit, and wherein the parameter value depends on a temperature of a base of the cooking vessel;
• applying a radio-frequency square-wave voltage to the resonant circuit such that a heating power is supplied to the base of the cooking vessel at a heating power setpoint value;
• evaluating a time profile of the parameter value for determining the boiling point of the liquid;
• after the boiling point has been determined, reducing the heating power setpoint value by a predefined amount over a predefined time period;
• after the predefined time period has elapsed, determining and storing a current parameter value;
• and
• adjusting the parameter value to a setpoint value which is dependent on the stored parameter value.