Magnetic Field Detection Device Using Feedback Cancellation
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Solution Overview
Problem
Existing magnetic field detection devices face challenges in minimizing the number of differential operation parts and achieving miniaturization while effectively canceling out environmental magnetic fields and reducing temperature drift caused by temperature fluctuations.
Innovation Solution
The magnetic field detection device employs a first and second magnetic field generating part with corresponding detection elements and differential operation parts, where feedback currents are used to generate magnetic fields opposite to environmental fields, allowing for reduced parts and improved linearity by inhibiting temperature-induced output variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple differential operation parts are used to eliminate environment magnetic field, then the detection accuracy is improved, but the device complexity and parts number increase
Solution Approach 1:
The patent combines the environment magnetic field elimination function and the detection object magnetic field detection function into a single differential operation part. The first magnetic field detection element detects the environment magnetic field, the second magnetic field detection element detects both the environment magnetic field and the detection object magnetic field, and the single differential operation part processes both signals to eliminate the environment magnetic field and output the detection object magnetic field. This merging approach reduces the parts number and device complexity while maintaining detection accuracy.
2Measurement precision
If multiple differential operation parts are used to eliminate environment magnetic field, then the detection accuracy is improved, but the device size increases
Solution Approach 1:
The patent merges multiple functions into a single integrated structure. The first and second magnetic field detection elements are positioned at different locations, and the single differential operation part processes their outputs together. This integration reduces the overall device volume by eliminating the need for separate elimination and detection circuits, achieving miniaturization while maintaining the ability to accurately detect weak magnetic fields.
3Measurement precision
If magnetoresistance element is used in magnetic field detection, then the detection sensitivity is improved, but the temperature drift increases
Solution Approach 1:
The patent places the first magnetic field detection element in a location where it is exposed primarily to the environment magnetic field, while the second magnetic field detection element is placed where it is exposed to both the environment magnetic field and the detection object magnetic field. This spatial differentiation allows the differential operation part to effectively cancel the environment magnetic field and its temperature-induced variations, thereby reducing temperature drift while maintaining the high sensitivity of magnetoresistance elements.
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 decreases the number of differential operation parts, enables miniaturization, and effectively reduces the influence of environmental magnetic fields and temperature drift, enhancing the accuracy and stability of magnetic field detection.
Implementation Method 1
a first feedback current flows into the first magnetic field generating conductor, and thus the first magnetic field generating part provides the first magnetic field detection element with a first feedback current magnetic field, with a direction opposite to the environment magnetic field
Implementation Method 2
the second magnetic field generating part provides the second magnetic field detection element with a magnetic field corresponding to the second current, with a direction opposite to the environment magnetic field
Implementation Method 3
a first output of the first magnetic field detection element corresponding to the environment magnetic field is inputted into the first differential operation part
Implementation Method 4
a detection magnetic field is detected by the second magnetic field detection part
Data Source
AI summary
A magnetic field detection device includes: a first magnetic field generating part, including a first magnetic field generating conductor; a first magnetic field detection part, including a first magnetic field detection element and a first differential operation part, wherein a first output of the first magnetic field detection element corresponding to the environment magnetic field is inputted into the first differential operation part, and a first feedback current flows into the first magnetic field generating conductor, and thus the first magnetic field generating part provides the first magnetic field detection element with a first feedback current magnetic field, with a direction opposite to the environment magnetic field; a second magnetic field generating part, including a second magnetic field generating conductor, in which a second current corresponding to the first feedback current flows; and a second magnetic field detection part, including a second magnetic field detection element.