V-Shaped Conductor Current Sensor with Magnetoresistive Elements
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Solution Overview
Problem
Current current sensors face challenges in miniaturization and achieving high sensitivity and stability, particularly with the use of giant magnetoresistive elements in U-shaped conductor lines, which limit their ability to detect currents with precision and accuracy.
Innovation Solution
The design incorporates a V-shaped or straight-line conductor line with pairs of magnetoresistive elements arranged to optimize current magnetic field interaction, allowing for reduced distances between elements while maintaining sufficient field intensity, and uses a bridge circuit configuration to measure current based on voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If magnetoresistive elements are arranged on parallel portions of a U-shaped conductor line, then the sensor can detect current magnetic fields, but the distance between elements must be large to avoid magnetic field interaction, preventing miniaturization
Solution Approach 1:
The patent inverts the conventional U-shaped conductor line configuration by using a V-shaped conductor line. This inversion changes the spatial relationship between the conductor and magnetoresistive elements, allowing elements to be placed on the V-shaped arms where magnetic field interaction is reduced, enabling miniaturization while maintaining detection precision
Solution Approach 2:
The patent employs asymmetric V-shaped conductor line configuration instead of symmetric U-shaped configuration. The V-shape creates different spatial paths for current flow, which reduces magnetic field coupling between adjacent magnetoresistive elements, allowing closer placement and smaller sensor size without compromising measurement accuracy
2Volume of moving object
If magnetoresistive elements are placed close together, then the sensor can be miniaturized, but magnetic field interaction between elements increases, reducing detection accuracy
Solution Approach 1:
By inverting from U-shaped to V-shaped conductor configuration, the patent creates a geometry where closely spaced magnetoresistive elements on the V-arms experience reduced magnetic field interaction, enabling miniaturization while maintaining detection stability
Solution Approach 2:
The patent applies local quality by positioning magnetoresistive elements specifically on the V-shaped arms where the magnetic field distribution provides optimal detection conditions with reduced interaction, rather than uniformly distributing them across a U-shaped structure
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 enables a more compact and precise current measurement with reduced measurement errors due to temperature differences, improving sensitivity and stability compared to traditional U-shaped designs.
Implementation Method 1
a giant magnetoresistive element developing a Giant Magneto-Resistive effect (hereinafter referred to as GMR element) is arranged in a current magnetic field generated by the control current instead of the Hall element in order to detect its gradient
Implementation Method 2
a conductor line that generates a current magnetic field when current flows, capable of detecting a change in the current with high sensitivity
Data Source
AI summary
The present invention provides a current sensor of smaller and simpler configuration, capable of measuring a current to be detected with high precision and stability. A current sensor has a V-shaped conductor line and a pair of magnetoresistive elements disposed along with the conductor line so that a resistance value of one of the magnetoresistive elements changes in a direction opposite to that of resistance-value-change of the other magnetoresistive element according to current magnetic fields produced by a current to be detected flowing through the conductor line.