Electric radiant heater with an active sensor for cooking vessel detection
US5893996A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1997 |
| Grant date | Apr 13, 1999 |
| Priority date | — |
| Expiry date | Feb 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2213/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric radiant heater is constructed with a pot detection system for switching on one or more heating areas. The pot detection system operates inductively according to the resonant circuit detuning principle. The sensor consists of a single-turn loop made from thick wire and which in the vicinity of the heating areas is positioned above the latter and just below a glass ceramic plate. In the case of a two-circuit heater, the sensor loop is shaped with clearly defined circumferential areas in said heating areas, so that the signal has a stepped transition between these areas and consequently a pot size detection in adaptation to the heating areas is possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.