Differential Current Sensor Layout With Metal Plate Field Shaping
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Solution Overview
Problem
Existing magnetic field sensors face challenges in achieving high measurement accuracy without increasing power loss by reducing the conductor cross section, which can lead to overheating and reduced mechanical stability.
Innovation Solution
A sensor device design incorporating a current conductor, a differential magnetic field sensor chip, and a metal plate above the conductor, where the sensor chip detects the magnetic field generated by the current, with the metal plate influencing the magnetic field to reduce phase errors and maintain conductor size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the cross section of the current conductor is reduced at the location of the magnetic field sensor, then the measurement accuracy is improved, but the power loss increases
Solution Approach 1:
A magnetic field concentrator is introduced as an intermediary component between the current conductor and the magnetic field sensor. This concentrator focuses and directs the magnetic field lines generated by the current toward the sensor, enhancing the magnetic field strength at the sensor location without requiring a reduction in conductor cross-section, thereby maintaining both measurement accuracy and acceptable power loss levels
Solution Approach 2:
The patent changes the magnetic field distribution parameters by introducing a magnetic field concentrator with specific magnetic permeability properties. This allows the magnetic field to be concentrated and directed toward the sensor, improving measurement accuracy while maintaining the original conductor dimensions and acceptable power loss characteristics
2Measurement precision
If the cross section of the current conductor is reduced, then the magnetic field strength at the sensor is increased, but the mechanical stability decreases
Solution Approach 1:
A magnetic field concentrator serves as an intermediary that enhances the magnetic field strength at the sensor location without requiring physical modification of the current conductor's cross-section. This maintains the conductor's mechanical integrity and stability while achieving the desired magnetic field enhancement through the concentrator's magnetic properties
Solution Approach 2:
The magnetic field enhancement function is segmented from the current conductor structure. Instead of modifying the conductor itself, a separate magnetic field concentrator component is introduced to perform the field concentration function, preserving the conductor's mechanical stability while achieving improved magnetic field detection
3Measurement precision
If a magnetic field concentrator is used, then the measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
The magnetic field concentrator is designed to be integrated within or around the current conductor structure, with the sensor positioned in relation to the concentrator. This nested arrangement minimizes the overall device footprint and reduces complexity by combining multiple functions (conductor, concentrator, sensor) in a compact integrated 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
The design improves measurement accuracy and frequency response while avoiding increased power loss and maintaining mechanical stability, allowing for coreless integration into external busbars.
Implementation Method 1
a differential magnetic field sensor chip which is arranged in an opening of the current conductor and is configured to detect a magnetic field generated by the electric current
Implementation Method 2
a metal plate that is arranged above the current conductor and above the magnetic field sensor chip
Data Source
AI summary
A sensor device contains a current conductor which is configured to carry an electric current, a differential magnetic field sensor chip which is arranged in an opening of the current conductor and is configured to detect a magnetic field generated by the electric current, and a metal plate that is arranged above the current conductor and above the magnetic field sensor chip.