Current Sensor Arch Conductor and Magnetic Sensors
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Solution Overview
Problem
Current sensors face reduced sensitivity due to external magnetic field interference and low magnetic flux density detection, particularly when magnetic detection elements are placed between parallel bus bars, leading to canceled magnetic fields and reduced measurement accuracy.
Innovation Solution
A current sensor design featuring a primary conductor with arch portions and magnetic sensors arranged in the width direction, where the sensors detect magnetic fields generated by the current flowing through the conductor, with a calculator to compute the current value from opposing or in-phase detection values, reducing external magnetic field influence and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnetic detection elements are placed between parallel bus bars, then the measurement range is broadened, but the magnetic flux density is reduced and sensitivity is lowered
Solution Approach 1:
The primary conductor is divided into multiple separate conductors (first conductor and second conductor) that are disposed apart from each other. This segmentation allows magnetic detection elements to be placed in regions with higher magnetic flux density while still measuring the total current, thereby improving sensitivity without sacrificing measurement range.
Solution Approach 2:
The patent transitions from a single-line bus bar configuration to a multi-dimensional arrangement where conductors are disposed in space apart from each other. This spatial arrangement creates regions with enhanced magnetic flux density around each conductor, allowing magnetic detection elements to operate with higher sensitivity while maintaining the ability to measure total current.
2Adaptability or versatility
If magnetic detection elements are disposed around the center between two lines, then the measurement range is expanded, but magnetic fields cancel each other and sensitivity is reduced
Solution Approach 1:
The patent extracts the magnetic detection elements from the central region between conductors and places them in specific regions around the conductors where magnetic flux density is higher. This extraction from the cancellation zone eliminates the harmful effect of magnetic field cancellation while maintaining the ability to measure total current through multiple detection points.
Solution Approach 2:
The patent utilizes the magnetic field cancellation effect in a beneficial way by strategically positioning magnetic detection elements in regions where fields from different conductors add constructively rather than cancel. The multi-conductor arrangement transforms what would be a cancellation zone into regions of enhanced magnetic flux density, improving detection sensitivity.
3Device complexity
If a single magnetic detection element is used, then the device complexity is reduced, but the sensitivity and accuracy are lowered due to external magnetic field interference
Solution Approach 1:
The patent applies local quality by positioning multiple magnetic detection elements in specific regions around different conductors where magnetic flux density is locally enhanced. Each detection element operates in its own optimized local environment, and the combined readings provide higher accuracy while reducing the impact of external magnetic fields compared to a single element approach.
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 design effectively increases the sensitivity of current sensors while minimizing the impact of external magnetic fields, achieving higher accuracy and reduced profile size with integrated components.
Implementation Method 1
a first magnetic sensor and a second magnetic sensor each detecting an intensity of a magnetic field generated by the current flowing through the primary conductor
Implementation Method 2
Each of the first magnetic sensor and the second magnetic sensor detects a magnetic field in the width direction
Data Source
AI summary
A current sensor includes a primary conductor through which a current to be measured flows and a first magnetic sensor and a second magnetic sensor that each detects an intensity of a magnetic field generated by the current flowing through the primary conductor. The current is diverted into two flow channels and flows through the primary conductor in a length direction of the primary conductor. The primary conductor includes an arch portion that extends in the length direction while bending to project in one thickness direction of the primary conductor, and defines one of the two flow channels. The first magnetic sensor is disposed on an inner side of the arch portion and is located on a side of an undersurface of the primary conductor. The second magnetic sensor is located on a side of a surface of a portion of the primary conductor which defines the other one of the two flow channels.