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US 5,655,841 AGranted
Error-compensated temperature measuring system
AssigneeWhessoe Varec, Inc.
InventorHarvey Storm
Life of this patent
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Abstract
An error-compensated temperature measurement system has a temperature sensor, an amplifying circuit and a compensation circuit for compensating non-linearities in the amplifying circuit of the temperature sensor. Specifically, the amplifying circuit has an analogue to digital converter exhibiting non-linearity characteristics, and the compensating circuit automatically compensates these non-linearities as well as correcting for the self-zero and self gain characteristics of the amplifying circuit.
Claims4
An error-compensated temperature measurement system, comprising:
- a current source;
- a temperature sensor receiving a current from the current source, the sensor having a resistance varying with temperature;
- an amplifier sensing a voltage across the temperature sensor and generating an amplified signal, the amplified signal representing a temperature measurement;
- voltage measuring means for measuring the amplified voltage signal in relation to a reference voltage and for generating a digital signal representing the temperature measurement;
- and
- a compensation means receiving the digital temperature measurement for generating a corrected temperature measurement compensated for variations in the amplifier, said compensation means further comprising:
- first ratio voltage means for generating a first reference voltage, the first reference voltage being a first fraction of the reference voltage;
- second ratio voltage means for generating a second reference voltage, the second reference voltage being a second fraction of the reference voltage;
- and
- means for measuring the first and second reference voltages;
- and
- wherein said compensation means compensates the digital temperature measurement according to the measured first and second reference voltages.
9 more elements
An error-compensated temperature measurement system, comprising:
- a temperature sensor which outputs a temperature-dependent signal;
- a measuring circuit which measures an analogue difference between a voltage associated with the temperature-dependent signal and a reference voltage and which generates a digital signal corresponding to said difference and representative of temperature measurement;
- and
- a compensation circuit which compensates for non-linearities of said measuring circuit introduced by said measuring circuit while generating the digital signal, said compensating circuit outputting a result which is independent of the reference voltage,
- wherein said compensation circuit comprises:
- a first reference voltage generator which generates a first reference voltage corresponding to a first fraction of the reference voltage;
- a second reference voltage generator which generates a second reference voltage corresponding to a second fraction of the reference voltage;
- and
- measuring circuits which measure the first and second reference voltages;
- wherein said compensating circuit compensates the digital temperature measurement according to the measured first and second reference voltages.
7 more elements
Dependencies are inferred from the claim text.