Magnetic Core Current Sensor with Opposite Magnetization
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Solution Overview
Problem
Current sensing technologies in industrial and commercial applications often require contact and have limitations in precision, thermal drift, and wide current range measurement, particularly in non-contact scenarios.
Innovation Solution
A current sensing method and sensor utilizing a magnetic core with opposite magnetization regions excited by a pickup coil, generating a magnetic field change when current passes through, allowing non-contact accurate current sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional contact-based current sensing methods are used, then the sensing can be performed with simple structure, but the measurement precision and thermal drift performance deteriorate
Solution Approach 1:
The patent replaces traditional contact-based mechanical sensing methods with a non-contact magnetic field sensing approach. By using a magnetic core and pickup coil to detect current through magnetic coupling rather than direct electrical contact, the system achieves higher measurement precision while eliminating thermal drift issues associated with physical contact sensors.
Solution Approach 2:
The patent introduces a magnetic core as an intermediary between the current-carrying conductor and the pickup coil. This magnetic core mediates the interaction by concentrating and directing magnetic flux, enabling accurate non-contact current sensing without direct electrical connection, thus improving precision while maintaining manageable device complexity.
2Reliability
If non-contact current sensing is implemented, then thermal drift is reduced and measurement range is expanded, but the device complexity increases
Solution Approach 1:
The patent replaces contact-based sensing with non-contact magnetic field sensing using a magnetic core and pickup coil arrangement. This substitution eliminates thermal drift caused by physical contact and resistive heating, significantly improving reliability and thermal stability while maintaining a manageable device structure through efficient magnetic coupling.
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (flux density, magnetization) in response to current variations. By monitoring these magnetic parameter changes through the pickup coil rather than direct electrical measurement, the system achieves superior thermal drift resistance and expanded measurement range while controlling device complexity through optimized magnetic core design.
3Measurement precision
If fluxgate technology is used for current sensing, then high precision and wide current range are achieved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the sensing system into distinct functional segments: a magnetic core for flux concentration, excitation coils for magnetization, and pickup coils for signal detection. This segmentation allows each component to be optimized and manufactured separately using standard techniques, reducing overall manufacturing difficulty while maintaining the high precision and wide current range characteristics of fluxgate technology.
Solution Approach 2:
The patent designs the magnetic core structure to serve multiple functions simultaneously: providing magnetic flux path, supporting coil windings, and enabling both excitation and sensing operations. This multi-functionality reduces the number of separate components needed, simplifying manufacturing processes while preserving the high precision measurement capabilities associated with fluxgate current sensing.
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
Enables precise and accurate current sensing with low thermal drift and wide current range capabilities, providing a non-contact solution for current measurement.
Implementation Method 1
exciting a magnetic core to generate at least one pair of regions having opposite magnetization directions in the magnetic core
Implementation Method 2
providing a current to pass through a sensing region of the magnetic core, so that the magnetic core correspondingly generates a magnetic field change
Implementation Method 3
sensing the magnetic field change of the magnetic core by a pickup coil wound around the magnetic core to output an output signal corresponding to the current
Data Source
AI summary
A current sensing method and a current sensor are provided. The current sensing method includes the steps of: exciting a magnetic core to generate at least one pair of regions having opposite magnetization directions in the magnetic core; providing a current to pass through a sensing region of the magnetic core, so that the magnetic core correspondingly generates a magnetic field change; and sensing the magnetic field change of the magnetic core by a pickup coil wound around the magnetic core to output an output signal corresponding to the current.