US 11,754,420 B2
Accuracy improvement in linear variable differential transformer based position measurements
Nageswara Rao Kalluri, Karnataka (IN); Sridhar Katakam, Bangalore (IN); Somasekhar Valleru, Bangalore (IN); Pravinsharma Kaliyannan Eswaran, Karnataka (IN); and Rajkumar Perumal, Karnataka (IN)
Assigned to HAMILTON SUNDSTRAND CORPORATION, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Feb. 8, 2021, as Appl. No. 17/169,974.
Claims priority of application No. 202011054153 (IN), filed on Dec. 12, 2020.
Prior Publication US 2022/0187103 A1, Jun. 16, 2022
Int. Cl. G01D 5/22 (2006.01); H01F 21/06 (2006.01); H03G 3/30 (2006.01)
CPC G01D 5/2291 (2013.01) [H01F 21/06 (2013.01); H03G 3/3089 (2013.01); H03G 2201/103 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A system comprising:
a transformer comprising a plurality of secondary windings, the plurality of secondary windings comprising a first secondary winding and a second secondary winding;
a first programmable-gain amplifier (PGA) coupled to the first secondary winding;
a second programmable-gain amplifier (PGA) coupled to the second secondary winding; and
a controller including a first input configured to receive a first digital signal indicative of a first voltage output from the first PGA, a first output configured to establish a first gain control feedback signal path with the first PGA, a second voltage input configured to receive a second digital signal indicative of a second voltage output from the second PGA, and a second output configured to establish a second gain control feedback signal path with the second PGA,
the controller configured to:
determine the first voltage output from the first PGA and the second voltage output from the second PGA;
iteratively perform:
compare the first voltage to a first threshold voltage to determine a gain correction is needed for a first gain for the first PGA, wherein the gain correction comprises outputting a first gain control signal to the first PGA via the first gain control feedback signal path to a change to the first gain; and
compare the second voltage to a second threshold voltage to determine a gain correction is needed for a second gain for the second PGA, wherein the gain correction comprises outputting a second gain control signal to the second PGA via the second gain control feedback signal path to change to the second gain; and
based on a determination that a gain correction is not needed for the first gain and the second gain, calculate a position measurement based on the first voltage and the second voltage;
wherein the calculating the position measurement based on the first voltage and the second voltage comprises:
receiving an enable signal; and
executing a position algorithm using the first voltage and the second voltage.