Magnetic Sensor Bridge Orientation for Accurate Current Detection
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Solution Overview
Problem
Traditional contact current measurement methods are complex and costly, and magnetic sensors are prone to interference from environmental magnetic fields, leading to low detection accuracy.
Innovation Solution
A magnetic sensor with at least two sensing portions that have different magnetic field component directions and configurations (half-bridge or full-bridge) to generate sensing electrical signals, eliminating interference from uniform magnetic fields and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional contact current measurement method using a resistor and sampling circuit is used, then current measurement can be achieved, but the overall device framework becomes complex and cost increases
Solution Approach 1:
The patent replaces the traditional mechanical/electrical contact measurement system (resistor + sampling circuit) with a magnetic field-based non-contact measurement system using magnetoresistive sensors. This substitution eliminates the need for physical contact and complex circuitry while achieving accurate current measurement through magnetic field detection
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the current-carrying conductor and the measurement system. The magnetic field serves as a mediator that carries information about the current without requiring direct electrical contact, thereby simplifying the measurement framework
2Device complexity
If a magnetic sensor is used to detect current, then the device structure is simplified, but detection accuracy decreases due to interference from environmental magnetic fields
Solution Approach 1:
The patent divides the sensing system into multiple magnetoresistive sensing units arranged in bridge configurations (half-bridge or full-bridge). This segmentation allows the system to distinguish between signal magnetic fields and environmental magnetic fields by comparing outputs from different sensing portions, thereby improving detection accuracy while maintaining structural simplicity
Solution Approach 2:
The patent changes the spatial arrangement and orientation parameters of multiple sensing portions to detect magnetic field components in different directions. By measuring magnetic field components along different axes and processing these signals differentially, the system can separate the signal of interest from environmental interference
3Device complexity
If a single sensing portion is used in the magnetic sensor, then the structure is simple, but the sensor cannot filter out environmental magnetic interference
Solution Approach 1:
The patent segments the sensing element into multiple sensing portions with different orientations and bridge configurations. This segmentation enables the system to detect and differentiate between signal magnetic fields and environmental magnetic fields, allowing for effective filtering of interference while maintaining relatively simple sensor structure
Solution Approach 2:
The patent employs asymmetric arrangements of magnetoresistive elements in half-bridge and full-bridge configurations with different orientations. This asymmetry in the sensing structure allows differential measurement that inherently rejects uniform environmental magnetic fields while responding to the signal magnetic field
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 magnetic sensor effectively filters out environmental magnetic interference, improving current detection accuracy and reducing complexity and cost.
Implementation Method 1
a magnetoresistive unit...configured to cause a resistance change to the first signal magnetic field...to generate a sensing electrical signal
Data Source
AI summary
A magnetic sensor having at least two sensing portions which are different in a direction of a magnetic field component of a first signal magnetic field generated by a current flowing through a conductor. The at least two sensing portions are correspondingly electrically connected. The sensing portion includes a half-bridge configuration or a full-bridge configuration. The sensing portion causes a resistance change to the first signal magnetic field through the half-bridge configuration or the full-bridge configuration so that a sensing electrical signal is generated.