Hall Sensor Temperature Compensation via Magnetic Field Component Quotient

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Solution Overview

Problem

Magnetic field sensors, such as 2D and 3D Hall sensors, are sensitive to variations in spacing between the control magnet and the sensor, leading to inaccurate measurements due to thermal expansions and mechanical vibrations, with existing compensation methods introducing temperature-dependent errors up to 12%.

Innovation Solution

A measurement method that detects at least two magnetic field components, applies temperature effect compensation, and uses an offset correction to establish a temperature-independent output signal, incorporating a temperature compensation factor to adjust magnetic field components and offset values, ensuring the angle calculation is independent of thermal variations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If conventional Hall sensors with internal arctangent calculation are used, then the measurement method is simple, but the measurement accuracy deteriorates due to temperature-dependent errors up to 12%

Engineering Contradiction:

Improvemeasurement method complexityVSAvoidmeasurement accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent applies parameter changes by modifying the calculation method from direct arctangent of magnetic field components to arctangent of corrected components that account for temperature effects. The control magnet's field components are corrected using temperature-dependent correction factors before the arctangent calculation, thereby compensating for thermal variations and improving measurement accuracy across temperature ranges.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If temperature compensation is applied using existing methods, then temperature effects are addressed, but measurement accuracy deteriorates due to introduced errors up to 12%

Engineering Contradiction:

Improvetemperature compensationVSAvoidmeasurement accuracy

Core Design Contradiction:

TemperatureVSMeasurement precision

Solution Approach 1:

The patent implements feedback by measuring the actual temperature with a temperature sensor and using this feedback to dynamically adjust the magnetic field component corrections. The temperature measurement feeds into the correction calculation, which then adjusts the magnetic field components accordingly, creating a closed-loop system that compensates for temperature effects without introducing significant errors.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If the spacing between control magnet and Hall sensor varies due to thermal expansion or mechanical vibrations, then the sensor can adapt to different positions, but measurement accuracy deteriorates due to sensitive reaction to spacing variations

Engineering Contradiction:

Improvespacing adaptationVSAvoidmeasurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent addresses spacing variations by changing the parameter used for calculation from direct magnetic field components to temperature-corrected components. By correcting the control magnet's field components based on temperature-dependent factors before calculation, the method becomes less sensitive to spacing variations caused by thermal expansion or mechanical vibrations, thereby maintaining measurement accuracy across different spacing conditions.

Inventive Principle:

Principle #35Parameter changes

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 provides a temperature-independent measurement signal across a broad temperature range, significantly reducing errors caused by thermal variations and improving the accuracy of displacement measurements.

Implementation Method 1

magnetic field sensors such as Hall sensors may be used to detect changes in a magnetic field

Methodology Applied

Scientific EffectHall effect: Hall Effect

Implementation Method 2

detected for example by means of a temperature sensor

Methodology Applied

Scientific EffectTemperature sensing: Thermocouple

Data Source

PatentUS10534044B2Temperature compensation method of magnetic control fields in a hall sensor with OS adaption

Publication Date: 2020.01.14 TE CONNECTIVITY GERMANY GMBH

AI summary

A method for detecting a relative position of a magnetic field source is disclosed. The method comprises the steps of detecting at least two magnetic field components of a magnetic field produced by a magnetic field source using a magnetic field sensor, determining a temperature effect compensation which compensates for a temperature effect on the magnetic field components, and establishing an output signal corresponding to the relative position of the magnetic field source based on a quotient of the magnetic field components, the temperature effect compensation, and an offset correction.