Wheatstone Bridge Resistance Estimation via Parallel Bias
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Solution Overview
Problem
Existing methods for measuring individual resistances in Wheatstone bridge sensors lack the desired accuracy for in-situ applications.
Innovation Solution
A method and system that apply bias voltages across a Wheatstone bridge circuit with a third resistance in parallel to determine the resistances of the first and second resistances using voltage measurements, allowing for accurate estimation of resistances through mathematical relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing measurement methods are used for Wheatstone bridge resistances, then the measurement process is simple, but the measurement precision is insufficient
Solution Approach 1:
The measurement process is divided into multiple discrete steps: applying first bias voltage to determine relationship between first and second resistances, then applying second bias voltage with third resistance to determine relationship between third resistance and at least one of the first or second resistances. This segmentation of the measurement process into distinct phases enables accurate determination of individual resistance values while managing system complexity through structured procedural steps.
Solution Approach 2:
The method performs preliminary mathematical relationship determinations before final resistance calculation. First, the relationship between first and second resistances is established through initial voltage measurement. Then, the relationship involving the third resistance is determined. These preliminary actions create a foundation of known relationships that enable accurate final resistance estimation without requiring direct complex measurements.
2Measurement precision
If multiple bias voltages and mathematical relationships are applied, then resistance measurement accuracy improves, but the measurement time increases
Solution Approach 1:
The measurement process maintains continuous useful action by seamlessly transitioning between different bias voltage applications and mathematical relationship determinations. The first bias voltage application and second bias voltage application are executed in continuous sequence, with each measurement phase building directly upon the previous one. This continuous approach minimizes idle time and ensures that the extended measurement duration is fully utilized for productive data collection and calculation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables precise measurement of resistances in Wheatstone bridge sensors, reducing errors from switch resistances and providing accurate resistance values independent of switch impedances.
Implementation Method 1
A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit
Implementation Method 2
The primary benefit of the Wheatstone bridge circuit is its ability to provide extremely accurate measurements
Data Source
AI summary
A method for estimating resistances of a circuit having a plurality of resistances comprising a first resistance and a second resistance may include applying a first bias voltage across the circuit and measuring a first voltage at a common node between the first resistance and the second resistance in order to determine a mathematical relationship between the first resistance and the second resistance, applying a second bias voltage across the circuit and a third resistance in parallel with the circuit and measuring a second voltage at the common node between the first resistance and the second resistance in order to determine a mathematical relationship between the third resistance and at least one of the first resistance and the second resistance, and based on at least the measurement of the first voltage and the measurement of the second voltage, determining the first resistance and the second resistance as a function of the third resistance.