Self-calibrating linear voltage differential transformer demodulator
AssigneesGoodrich Corporation, Goodrich Aerospace Services Private Limited
InventorsEric Duane Ronning, Natraj Ninjuri, Kalluri Rao
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Abstract
A calibration system includes an excitation module that introduces an excitation signal to a primary coil of a differential transformer, a measurement module that measures, at a first phase shift, a positive value of an induced signal. The induced signal is caused by the excitation signal on a secondary coil of the differential transformer. The system further includes a calculation module that compares the positive value to a last positive value to form a compared positive value, and a calibration module that changes the first phase shift based on the compared positive value.
Claims2
A differential transformer comprising:
- a primary winding;
- first and secondary windings;
- a moveable shaft disposed between the primary winding and the first and second secondary windings;
- a measurement module that measures voltages on the first and second secondary windings;
- an excitation module that introduces an excitation signal to the primary winding, the excitation signal having a positive peak and a negative peak and induces a first signal on the first winding and induces a second signal on the second secondary winding, the excitation module generating a first enable pulse based on the positive peak that causes the measurement module to measure a voltage on the first second winding;
- and
- a calibration module that shifts the first enable pulse by a first phase shift until a peak value of the first signal is found to form a phase shifted first enable pulse;
- wherein, the excitation module generates the phase shifted first enable pulse to cause the measurement module to measure the induced signal in the first secondary winding.
Dependencies are inferred from the claim text.