Current Sensor Busbar Notch and Dual Flow Path Design
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Solution Overview
Problem
Current sensors face challenges in accurately measuring currents due to interference from disturbance magnetic fields, and existing designs may not effectively enhance signal-to-noise ratios for precise current measurement.
Innovation Solution
A current sensor design featuring a busbar with two adjacent flow paths and magnetic sensors positioned to detect magnetic fields, where the busbar includes notch portions and a slit to optimize the placement of magnetic sensors for enhanced signal detection and noise cancellation, thereby increasing measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic sensors are positioned close to the conductor to detect magnetic fields, then measurement precision is improved, but noise interference from disturbance magnetic fields increases
Solution Approach 1:
The conductor is divided into multiple flow paths (first flow path and second flow path) that are adjacent to each other. Magnetic sensors are positioned to detect magnetic fields from both flow paths separately, allowing differential measurement that cancels out common-mode disturbance magnetic fields while preserving the signal from the measured current.
Solution Approach 2:
A slit is introduced as an intermediary structure between the first and second flow paths. This slit creates a magnetic field cancellation effect by allowing magnetic flux from adjacent flow paths to oppose each other, thereby reducing the impact of disturbance magnetic fields on the measurement.
2Measurement precision
If notch portions are added to the conductor to optimize sensor positioning, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
Notch portions are selectively added only at specific locations on the conductor where the first flow path is formed, rather than modifying the entire conductor structure. This localized modification optimizes the magnetic field distribution in the critical measurement region while minimizing overall structural complexity.
Solution Approach 2:
The notch portions are pre-formed on the conductor during manufacturing, establishing the optimal geometric configuration before the magnetic sensors are positioned. This preliminary structuring ensures that the magnetic field lines are properly concentrated and directed toward the sensor locations, maximizing signal detection efficiency.
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 significantly improves the signal-to-noise ratio and measurement precision by positioning magnetic sensors to detect signal magnetic fields effectively, reducing noise interference and enhancing current measurement accuracy.
Implementation Method 1
two magnetic sensors which are provided side by side in a width direction and detect magnetic fields produced by currents that flow through the conductor
Data Source
AI summary
A current sensor includes a conductor through which a current as a measurement target flows and two magnetic sensors. The conductor includes a first flow path, a second flow path adjacent to or in a vicinity of the first flow path in a width direction of the first flow path, and a first joining portion in which the first flow path and the second flow path merge with each other. The two magnetic sensors are provided side by side in a width direction and detect magnetic fields produced by currents that flow through the conductor. The conductor is provided with a first notch portion, in which a side edge in a farther side portion from the second flow path, of both of side edges of the first flow path in the width direction is notched.