Circuit device for a cooking device, in particular cooking hob, more in particular induction cooking hob and cooking device, in particular cooking hob, more in particular induction cooking hob

A circuit device for an induction cooking hob, comprising:

• a first induction cooking element;
• a second induction cooking element;
• a first power unit comprising a first frequency converter, a first current converter, and a controller;
• and
• a second power unit comprising a second frequency converter, a second current converter, and a second controller,
• wherein the first and second frequency converters are configured to convert an input mains current between 45 Hz or 130 Hz into an high-frequency current with a frequency between 10 kHz and 100 kHz, and to output the high-frequency current to the first and second induction cooking elements, respectively,
• wherein the first and second frequency converters comprise a rectifier and a frequency generator connected in series, the rectifier being common to the first and second frequency converters,
• wherein the first current converter is an insulated AC/DC current converter and is configured to convert an input alternating mains current into two first direct currents, and to output one of the two first direct currents to the first controller and another of the two first currents to the second current converter,
• wherein the second current converter is an insulated DC/DC current converter and is configured to convert the other of the two first currents into a second direct current, and to output the second direct current to the second controller,
• wherein two first direct currents have different voltages and the different voltages are between 5V and 18V, and
• wherein the first and second controllers are configured to output a driving frequency signal to the generators of the first and second frequency converters, respectively, and
• wherein, by controlling the output driving frequency signals, the first and second controllers are configured to limit a total power of the first and second frequency generators, respectively, to a predetermined maximum power such that a total power is below a rated power of each mains current phase.