Device for the high-precision control of a physical quantity such as the temperature or humidity in a household electrical appliance
US6163017A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1999 |
| Grant date | Dec 19, 2000 |
| Priority date | — |
| Expiry date | Mar 26, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25D2317/04131
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A device for controlling a physical quantity set by a user, such as temperature or humidity, in a household electrical appliance such as an oven, a refrigerator or a washing-drying machine comprises, for measuring this physical quantity, at least one member operationally connected to control means for this quantity which operate on means for regulating this quantity, such as at least one electrical heating resistance element, a compressor of a refrigeration circuit or the like. The measuring member is connected to means for generating a square wave electrical signal the period of which is proportional to the value of the measured physical quantity, said electrical signal being evaluated by the control means which, on the basis of its frequency, determine a final value for said signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.