ROTATING 3-WIRE RESISTANCE TEMPERATURE DETECTION EXCITATION CURRENT SOURCES AND METHOD
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United States of America Patent
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Aug 28, 2014
app pub date -
Jan 30, 2014
filing date -
Feb 27, 2013
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Abstract
In a temperature sensing circuit, a method for measuring a resistance of a RTD device to sense temperature includes (a) connecting a first terminal of the RTD device to a first current source and connecting a second terminal of the RTD device to a second current source; (b) measuring a first voltage across the RTD device; (c) connecting the second terminal of the RTD device to the first current source and connecting the first terminal of the RTD device to the second current source; (d) measuring a second voltage across the RTD device; and (e) deriving the resistance of the RTD device based on the first voltage measurement and the second voltage measurement. The RTD device may be connected in series with a sense resistor to ground.
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