G - Physics – 05 – D
Patent
G - Physics
05
D
341/39
G05D 16/20 (2006.01) G01L 1/22 (2006.01)
Patent
CA 1213337
ABSTRACT A temperature compensation circuit is provided which can be used for span temperature compensation in an electropneumatic transducer system and which includes a constant current generator circuit coupled to a bridge of piezo resistances in a pressure transducer to supply a constant current through one piezo resistance of the bridge to common. This constant current generator cir- cuit can be realized by a voltage divider circuit coupled to an output of a comparator with a junction of the volt- age divider circuit being coupled to one corner of the bridge at a junction between two piezo resistances, the opposite ends of which are connected respectively to V+ and common, and the other two corners of the bridge being coupled respectively to the inputs of the comparator. The electropneumatic transducer system includes a zeroing circuit which supplies a current to a current to voltage converter circuit having a span setting circuit and to a voltage regulator circuit for generating rail voltages VR, VC and VB. A pressure transducer comprising piezoresistances is coupled to an output pressure line and has an elec- trical output coupled to the span temperature correction circuit. The output from the span temperature correc- tion circuit and the output from the current to voltage converter circuit are both supplied to inputs of a high gain comparator. The output of the high gain comparator is supplied to a voltage chopping circuit and the chopped voltage is supplied to a transformer. The output from the transformer is rectified and supplied to a piezocer- amic bender. A linearity correction circuit is coupled between the output of the span temperature correction circuit and system common. A low current shutoff circuit is coupled between the voltage regulator circuit and the span tem- perature correction circuit. A high current shutoff cir- cuit is coupled between the voltage regulator circuit and a gain circuit for the high gain comparator.
445711
Mcgraw-Edison Company
Shapiro Cohen
LandOfFree
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