Back to results
US 2016/0109897 A1Published application
Control system with always on calibration and test and calibration and test circuit
AssigneeBAE Systems Controls Inc.
InventorsRussell M. Petrosky, Stephen J. Gabaly, Patrick Nee
Life of this patent
Estimating the term…
Abstract
A continuous, always on, high accuracy AC reference signal is added to an AC voltage of interest to calibrate the AC voltage of interest. The AC reference voltage has a first frequency. The AC voltage of interest has a second frequency. A control system having calibration.
Claims18
A system comprising:
- an AC reference voltage generating circuit configured to generate an AC reference voltage having a first frequency;
- an adding circuit configured to add the AC reference voltage to an AC voltage output from a sensor, the AC voltage having a second frequency, the adding circuit including a first resistor having a first end coupled to the AC reference voltage, a second resistor having a first end coupled to the AC voltage, a second end of the first resistor is coupled to a second end of the second resistor, a bias voltage is added to the AC reference voltage and the AC voltage to generate an added AC voltage;
- a signal condition circuit configured to adjust an amplitude of the added AC voltage by an adjustment amount;
- an A/D converter configured to convert the adjusted AC voltage into digital signals;
- and
- a processor configured to execute a first discrete fourier transform of the digital signals at the first frequency corresponding to the reference AC voltage and a second discrete fourier transform of the digital signals at the second frequency corresponding to the AC voltage and configured to determine a calibrated output based on the first discrete fourier transform and the second discrete fourier transform.
3 more elements
A control system comprising:
- a plurality of sensors, each outputting an AC voltage indicative of a sensed value, the AC voltage having a first frequency;
- an AC reference generating circuit configured to output an AC reference voltage having a second frequency;
- a plurality of calibration circuits, one calibration circuit for a respective sensor, each of the plurality of calibration circuits receiving the AC reference voltage from the AC reference generating circuit, each calibration circuit comprising:
- an adding circuit configured to add the AC reference voltage to the AC voltage output from a respective one of the plurality of sensors, the adding circuit including a first resistor having a first end coupled to the AC reference voltage, a second resistor having a first end coupled to the AC voltage, a second end of the first resistor is coupled to a second end of the second resistor, a bias voltage is added to the AC reference voltage and the AC voltage to generate an added AC voltage;
- a signal condition circuit configured to adjust an amplitude of the added AC voltage by an adjustment amount;
- and
- an A/D converter configured to convert the adjusted AC voltage into digital signals, and a processor coupled to each of the plurality of calibration circuits, the processor configured to determine a calibrated output value associated with each of the plurality of sensors based on the digital signals received from each of the plurality of calibration circuits and determine at least one control parameter based at least on the calibrated output, from at least one of the plurality of calibration circuits for controlling a downstream component.
4 more elements
Dependencies are inferred from the claim text.