Device for the high-precision control of a physical quantity suc

Details Device for the high-precision control of a physical quantity suc Device for the high-precision control of a physical quantity suc

1999-03-26

2000-12-19

Pelham, Joseph

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219494, 219492, 374170, H05B 102, G01K 714, G01K 734

Patent

active

061630179

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.

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