INDUCTION GENERATOR FOR INDUCTION HEATING DEVICES AND A METHOD FOR THE OPERATION OF AN INDUCTION GENERATOR FOR INDUCTION HEATING ELEMENTS

摘要

The present invention relates to an induction generator for induction heating elements, in particular for induction coils of a cooking hob. The induction generator is connected or connectable to different lines (L1, L2, L3) of a three-phase mains. The induction generator includes a control unit (10) connected to a current transformer (38), placed on one (L1) of the lines (L1, L2, L3) of the three-phase mains. The induction generator includes a number of power sections (26, 28, 30, 32, 34, 36). Each power section (26, 28, 30, 32, 34, 36) is provided for supplying one of the induction heating elements (40, 42, 44, 46, 48, 50). The control unit (10) is provided for estimating and correcting harmonic distortions of the mains current via the current transformer (38). The power transferred to a heated object as a function of the frequency is stored or storable in a memory of the control unit (10), so that the heated object is identifiable by its frequency-power characteristic. The frequency spectrum of the transferred power related to a harmonic distortion in the line (L1) supplying the control unit is stored or storable in the memory of the control unit (10), if said harmonic distortion exceeds a predetermined limit. The harmonic distortions of the mains current are corrected or correctable by the control unit (10), if a heated object with the frequency-power characteristic related to the harmonic distortion is detected.