Induction generator for induction heating devices and a method for the operation of an induction generator for induction heating elements
US9572202B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2012 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Oct 13, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2213/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An induction generator is connected to a three-phase mains. The induction generator includes a control unit (10) connected to a current transformer (38), 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) supplies one of the induction coils (40, 42, 44, 46, 48, 50). A control unit (10) estimates and corrects 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 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) is stored in the memory (10) if the distortion exceeds a predetermined limit. The harmonic distortions are corrected by the control unit (10) if a heated object with the frequency-power characteristic related to the harmonic distortion is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.