Magnetoresistance Sensor Wheatstone Bridge Circuit Design
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Solution Overview
Problem
Existing magnetic field sensing apparatuses are complex and bulky due to the need for multiple coils and circuits to measure magnetic field components in three directions, which hinders their miniaturization and application in handheld devices.
Innovation Solution
A magnetic field sensing apparatus with a substrate, magnetoresistance sensors, and magnetization direction setting devices, where multiple magnetoresistance sensors form full Wheatstone bridges and magnetization direction setting devices overlap to simultaneously set/reset the magnetoresistance sensors, reducing the number of required magnetization direction setting devices and simplifying the circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple coils and circuits are used to measure magnetic field components in three directions, then measurement capability is improved, but device complexity and size increase
Solution Approach 1:
The patent merges the functions of multiple coils and circuits into a single integrated magnetic field sensing apparatus. The magnetoresistance sensors are arranged to form complete Wheatstone bridges that can measure magnetic field components in three directions simultaneously, eliminating the need for separate coils and circuits for each direction.
Solution Approach 2:
The magnetic field sensing apparatus is designed with multi-functionality to measure magnetic field components in three different directions using a unified structure. The magnetoresistance sensors and Wheatstone bridge configuration enable the device to perform multiple measurement functions without requiring separate dedicated circuits for each direction.
2Adaptability or versatility
If multiple coils and circuits are used to measure magnetic field components in three directions, then measurement capability is improved, but device size increases
Solution Approach 1:
The patent combines multiple measurement functions into a single compact apparatus. The magnetoresistance sensors are integrated in a space-efficient arrangement that forms complete Wheatstone bridges, allowing three-directional magnetic field measurement without requiring the separate coils and circuits that would occupy more space.
Solution Approach 2:
The patent transitions from a planar arrangement of separate coils and circuits to a three-dimensional integration of magnetoresistance sensors and Wheatstone bridge structures. This spatial reconfiguration enables multiple measurement functions to be packed into a smaller volume by utilizing vertical stacking and layered arrangements.
3Ease of operation
If traditional coil-based magnetization direction setting is used, then control capability is improved, but circuit complexity increases
Solution Approach 1:
The patent extracts and eliminates the traditional coil-based magnetization direction setting mechanism from the system. Instead of using separate coils to control magnetization direction, the invention uses the inherent properties of magnetoresistance sensors combined with Wheatstone bridge configurations to achieve the same control function with simpler circuitry.
Solution Approach 2:
The magnetoresistance sensors in the Wheatstone bridge configuration are designed to self-regulate and respond to magnetic field changes without requiring external coil-based control mechanisms. The sensors inherently provide the necessary control capability through their resistance changes in response to magnetic field orientation, eliminating the need for separate control 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 configuration allows for a simpler circuit design and faster response speed while enabling the measurement of magnetic field components in three axes, addressing the complexity and bulkiness issues of existing systems.
Implementation Method 1
a plurality of magnetoresistance sensors (120) disposed on the substrate (110)
Implementation Method 2
a plurality of magnetization direction setting devices (130) disposed on the substrate (110)
Data Source
AI summary
A magnetic field sensing apparatus including a substrate, a plurality of magnetoresistance sensors and a plurality of magnetization direction setting devices is provided. A surface of the substrate includes a plurality of inclined surfaces and a plane surface. The magnetoresistance sensors include a plurality of first magnetoresistance sensors disposed at the inclined surfaces and a plurality of second magnetoresistance sensors disposed at the plane surface. The first magnetoresistance sensors include a first and a third portions and form a first full Wheatstone Bridge. The second magnetoresistance sensors include a second and a fourth portions and form a second full Wheatstone Bridge. The magnetization direction setting devices include a first and a second magnetization direction setting devices. The first magnetization direction setting device is disposed beside and overlaps with the first and the second portions. The second magnetization direction setting device is disposed beside and overlaps with the third and the fourth portions.