Magnetic Field Sensing Module with Asymmetric Magnetoresistors
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Solution Overview
Problem
Existing magnetic field sensing modules are limited by fixed signal output periods, which restrict the acquisition of magnetic field information content and fail to support larger-period signal output, leading to misalignment and large errors in magnetic field component distribution.
Innovation Solution
A magnetic field sensing module comprising multiple magnetoresistors with different current directions, where excitation magnetic fields are applied to each magnetoresistor to create differences in magnetization directions, allowing for the expansion of sensing periods beyond the original output period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional magnetic sensors with fixed-period signal output are used, then sensitivity and cost are optimized, but the sensing range is limited and cannot support larger-period signal output
Solution Approach 1:
The magnetic sensor is divided into multiple sensing components (first and second sensing components) with different sensing directions. Each component senses magnetic field components in different directions, and their outputs are combined to achieve extended sensing range while maintaining sensitivity through proper signal processing
2Device complexity
If sensing components are arranged unidirectionally, then device complexity is reduced, but misalignment with geometric center occurs and large errors are caused in magnetic field component distribution
Solution Approach 1:
The sensing components are arranged in asymmetric positions relative to the geometric center, with each component having a specific sensing direction that is intentionally misaligned. This asymmetric arrangement, combined with signal processing, compensates for individual alignment errors and achieves accurate magnetic field measurement
3Device complexity
If vertical Hall devices are used, then device integration is improved, but sensitivity is reduced
Solution Approach 1:
Multiple vertical Hall devices with different sensing directions are combined in a single magnetic sensor. By integrating multiple components that sense different magnetic field components and processing their combined output, the system achieves both high integration and maintained sensitivity through synergistic operation
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
The proposed solution enables the magnetic field sensing module to support larger-period sensing, enhance the richness of magnetic field information, and correct sensing direction information to match actual direction information, thereby improving the accuracy and range of magnetic field detection.
Implementation Method 1
a first magnetoresistor and a second magnetoresistor coupled in series
Implementation Method 2
the first magnetoresistor is applied with a signal magnetic field carrying direction information and a first excitation magnetic field, and the second magnetoresistor is applied with the signal magnetic field and a second excitation magnetic field
Data Source
AI summary
The present application discloses a magnetic field sensing module and a magnetic sensor. The magnetic field sensing module comprises: a first magnetoresistor and a second magnetoresistor coupled in series; in a first state, the first magnetoresistor is applied with a signal magnetic field carrying direction information and a first excitation magnetic field, and the second magnetoresistor is applied with the signal magnetic field and a second excitation magnetic field; in a second state, the first magnetoresistor is applied with the signal magnetic field and a third excitation magnetic field, and the second magnetoresistor is applied with the signal magnetic field and a fourth excitation magnetic field. The magnetic field sensing module provided by the present application can be used to realize the expansion of the output period and enhance the richness of the magnetic field signal content that can be obtained.