US 12,264,977 B2
Common signal conditioning circuit for temperature sensor
Dhananjay Kumar, Bangalore (IN); Krishan Kant Sharma, Uttar Pradesh (IN); and Swathika Sreedhar, Tamil Nadu (IN)
Assigned to HAMILTON SUNDSTRAND CORPORATION, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Mar. 9, 2022, as Appl. No. 17/690,465.
Claims priority of application No. 202211001726 (IN), filed on Jan. 12, 2022.
Prior Publication US 2023/0221189 A1, Jul. 13, 2023
Int. Cl. G01K 7/20 (2006.01)
CPC G01K 7/20 (2013.01) 18 Claims
OG exemplary drawing
 
1. A ratiometric temperature measurement system comprising:
a sensing circuit configured to measure a temperature, the sensing circuit including a temperature sensing circuit and a current sensor, the sensing circuit being configured to utilize an electrical current (Io) to output a first voltage indicative of a first voltage differential (VT_SENSOR) across the temperature sensing circuit and to output a second voltage indicative of a second voltage differential (VC_SENSOR) across the current sensor; and
a controller configured to determine a resistance (RT_SENSOR) corresponding to the temperature sensing circuit based at least in part on the first and second voltage differentials (VT_SENSOR and VC_SENSOR), and to determine a temperature value (TOUT) indicative of the measured temperature based on the resistance (RT_SENSOR), wherein the controller comprises:
memory configured to store a look-up table (LUT) populated with a plurality of predetermined resistance values that are mapped to corresponding predetermined temperature values; and
a processor in signal communication with the memory, the processor configured to compare the resistance (RT_SENSOR) to the predetermined resistance values, select a predetermined temperature value corresponding to the predetermined resistance value that matches the resistance (RT_SENSOR), and output the selected predetermined temperature value as the temperature value (TOUT).