Load applicability detecting device for induction-heating cooking apparatus
US4810847A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1988 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Feb 11, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/901
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A load applicability detecting device for induction-heating cooking apparatus includes a heating coil for an heating metallic cooking pans by means of electromagnetic induction, an inverter supplying the heating coil with high frequency currents, a soft starter for gradually decreasing an output frequency of the inverter at the time of the starting of the inverter, an input current detector for detecting the inverter input current at an initial stage of the starting of the inverter to obtain a detection signal, a reference signal generator for generating a reference signal in synchronization with the starting of the inverter, the level of the reference signal being varied with a predetermined time constant, and a comparator for comparing a detection signal generated by the input current detector with the reference signal generated by the reference signal generator to produce a load applicability detection signal in accordance with the difference between the levels of the detection signal and the reference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.