Hall Element Stress and Temperature Compensation
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Solution Overview
Problem
Existing Hall element sensors face challenges in accurately compensating for mechanical stress and temperature effects on magnetic sensitivity, leading to variations in sensor accuracy and increased layout area and current consumption due to the use of separate mechanical stress detection elements and limited effective range of compensation.
Innovation Solution
A Hall electromotive force compensation device that utilizes a Hall element and a temperature sensor to generate compensation signals based on resistance values across different terminal pairs and temperature information, allowing for concurrent mechanical stress and temperature compensation without increasing layout area or current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single Hall element is used for mechanical stress detection, then the layout area and current consumption are reduced, but the measurement precision of magnetic sensitivity compensation deteriorates
Solution Approach 1:
The Hall element serves dual functions: it detects both the mechanical stress (through resistance value changes) and the magnetic field (through Hall electromotive force generation). This multi-functionality eliminates the need for separate detection elements, reducing layout area while maintaining compensation precision through the use of multiple terminal pairs for stress detection
Solution Approach 2:
The invention measures resistance values across multiple terminal pairs (different dimensions/ orientations) of the same Hall element to extract mechanical stress information. By utilizing resistance measurements in different directions rather than adding more physical sensors, the system achieves accurate stress detection without increasing layout area
2Measurement precision
If separate mechanical stress detection elements are used, then the measurement precision of magnetic sensitivity compensation is improved, but the layout area and current consumption increase
Solution Approach 1:
The Hall element simultaneously performs magnetic field sensing and mechanical stress detection functions. By measuring resistance values across different terminal pairs, the system extracts stress information from the same component used for magnetic sensing, eliminating the need for separate stress detection elements and their associated power consumption
Solution Approach 2:
The invention combines the magnetic field detection function and mechanical stress detection function into a single Hall element. The resistance value measurements across multiple terminal pairs provide stress information that is combined with the Hall electromotive force measurements to achieve comprehensive compensation without additional active components
3Measurement precision
If conventional temperature compensation methods are used, then the magnetic sensitivity compensation accuracy is improved, but the device complexity increases
Solution Approach 1:
The Hall element provides both magnetic field measurement and mechanical stress measurement capabilities. By utilizing resistance value changes across different terminal pairs, the system concurrently detects stress effects and temperature effects, enabling comprehensive compensation through a unified processing approach rather than separate compensation circuits
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 high-accuracy compensation of magnetic sensitivity in Hall elements, effectively addressing the limitations of previous technologies by simultaneously addressing mechanical stress and temperature effects while minimizing resource usage.
Implementation Method 1
a Hall element configured to generate a Hall electromotive force
Implementation Method 2
it is known that the magnetic sensitivity of the Hall element varies depending not only on the temperature effect but also on the mechanical stress effect (Piezo-Hall Effect)
Data Source
AI summary
A Hall resistance measurement unit measures a Hall resistance value in two or more current directions between a plurality of terminals of the Hall element. A Hall electromotive force measurement unit measures the Hall electromotive force of the Hall element. A temperature measurement unit measures an operating temperature of the Hall element. A compensation signal generation unit compensates the Hall electromotive force on the basis of the Hall resistance value from the Hall resistance measurement unit and a temperature output value from the temperature measurement unit. A compensation coefficient calculation circuit calculates a compensation coefficient on the basis of the Hall resistance value measured by the Hall resistance measurement unit and the temperature output value measured by the temperature measurement unit. The compensation coefficient includes a mechanical stress compensation coefficient and a temperature compensation coefficient.