Cooktop with a non-metallic hotplate
US6242721A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1999 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Apr 6, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2213/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The cooktop has a cooking zone (2), at least one electric heating unit (7, 7') assigned to the cooking zone (2) and a device for detecting a metal pot on the cooking zone (2) and determining its size when the metal pot is resting on the cooking zone (2). The device for detecting the presence and advantageously the size of the metal pot includes a measuring sensor (3) arranged near the cooking zone (2) and one or more evaluation devices (5, 5") communicating with the measuring sensor (3). The measuring sensor (3) includes a primary measuring coil (8) and one or more secondary measuring coils. The primary measuring coil terminals (8a,8b) are electrically connected with corresponding poles of an alternating voltage generator (4) for generating an alternating current in the measuring coil (8) and a magnetic alternating testing field that interacts with the one or more secondary measuring coils to induce a voltage in them. The respective evaluation devices (5, 5") include comparators (15,15") for comparing the induced voltages in the corresponding secondary measuring coils (9,20) with voltage threshold values to detect the presence and advantageously the size of a metal pot placed on th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.