Dynamic Calibrating Current Sensor Drift Suppression

Solution Overview

Problem

Conventional current sensor control systems are susceptible to current drifting due to temperature variations, leading to inaccurate current readings and errors in system diagnosis.

Innovation Solution

A dynamic calibrating current sensor control system that includes an electronic drift current suppression circuit, which applies an offset value to the current signal from the current sensor to generate a corrected current signal, effectively canceling drift current and improving measurement accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional current sensor is used without dynamic calibration, then device complexity is reduced, but measurement precision deteriorates due to temperature-induced drift

Engineering Contradiction:

Improvecurrent measurement precisionVSAvoidsensor system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system performs preliminary calibration by storing a first current value from the current sensor when the switch is in an open state (disconnecting power supply from load) before actual measurement. This preliminary action captures the drift current component, which is then subtracted from subsequent measurements to eliminate temperature-induced drift effects.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors the current sensor output and dynamically adjusts measurements by subtracting the stored drift current value. This feedback mechanism ensures that drift errors are compensated in real-time, maintaining measurement precision across varying temperature conditions without requiring manual recalibration.

Inventive Principle:

Principle #23Feedback

2Reliability

If current sensor operates in varying temperature conditions without drift compensation, then device simplicity is maintained, but reliability deteriorates due to false current readings

Engineering Contradiction:

Improvesystem diagnosis reliabilityVSAvoidcalibration circuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system performs preliminary calibration by storing a first current value from the current sensor when the switch is in an open state (disconnecting power supply from load) before actual measurement. This preliminary action captures the drift current component, which is then subtracted from subsequent measurements to eliminate temperature-induced drift effects.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors the current sensor output and dynamically adjusts measurements by subtracting the stored drift current value. This feedback mechanism ensures that drift errors are compensated in real-time, maintaining measurement precision across varying temperature conditions without requiring manual recalibration.

Inventive Principle:

Principle #23Feedback

3Loss of information

If drift current is not suppressed, then device complexity is minimized, but loss of information increases due to inaccurate current level detection

Engineering Contradiction:

Improvecurrent level information accuracyVSAvoiddrift suppression circuit complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The system performs preliminary calibration by storing a first current value from the current sensor when the switch is in an open state (disconnecting power supply from load) before actual measurement. This preliminary action captures the drift current component, which is then subtracted from subsequent measurements to eliminate temperature-induced drift effects.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors the current sensor output and dynamically adjusts measurements by subtracting the stored drift current value. This feedback mechanism ensures that drift errors are compensated in real-time, maintaining measurement precision across varying temperature conditions without requiring manual recalibration.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP3124990B1Dynamic calibrating current sensor

Publication Date: 2025.05.21 HAMILTON SUNDSTRAND CORP

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AI summary

A dynamic calibrating current sensor control system includes an input power supply (202) that generates an input current and a current sensor (208) interposed between the input power supply and the load. The current sensor is configured to output at least one current signal indicating a level of current delivered to the load. The dynamic calibrating current sensor control system also comprises an electronic switching control circuit (212) that generates at least one control signal to selectively connect the input power supply to the load, and an electronic drift suppression circuit (214) in signal communication with the current sensor and the switching control circuit. The drift suppression circuit is configured to generate a corrected current signal in response to applying an offset value to the current signal. The offset value cancels the drift current from the current signal in response to connecting the input power supply to the load.