Current Detection System Magnetic Flux Shielding
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Solution Overview
Problem
Current detection systems face reduced accuracy due to the inability to effectively shield external magnetic flux, leading to interference in current detection measurements.
Innovation Solution
A current detection system is designed with magnetic plates arranged in parallel in the height direction, creating a non-permeable space for external magnetic flux and a permeable space for the bus bar and magneto-electric conversion element, allowing for accurate detection of current flowing through the bus bar by converting the measurement object magnetic flux in the lateral direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If magnetic plates are arranged in the Y direction to form a magnetic shielding region, then the structure is simple and easy to manufacture, but external magnetic flux along the Y direction cannot be shielded, reducing detection accuracy
Solution Approach 1:
The patent changes the arrangement direction of magnetic plates from the Y direction to the Z direction (height direction), utilizing a different spatial dimension to achieve effective magnetic shielding. This dimensional change allows the magnetic plates to bend external magnetic flux lines along the Z direction while maintaining structural simplicity, thereby resolving the contradiction between ease of manufacture and detection accuracy.
2Reliability
If magnetic plates are arranged in the Y direction, then the magnetic shielding region is formed between plates, but external magnetic flux along the Y direction passes through without being bent, causing detection errors
Solution Approach 1:
The patent changes the orientation parameter of magnetic plates from Y-direction alignment to Z-direction alignment. This parameter change fundamentally alters how external magnetic flux interacts with the magnetic plates, enabling the plates to effectively bend and redirect flux lines along the Z direction, thereby achieving both reliable magnetic shielding and accurate current detection.
3Device complexity
If the magneto-electric conversion element detects magnetic flux along the Y direction, then the detection mechanism is straightforward, but external magnetic flux along the Y direction interferes with the measurement
Solution Approach 1:
The patent introduces magnetic plates arranged in the Z direction as an intermediary element between the external environment and the magneto-electric conversion element. These magnetic plates act as a mediator that selectively bends external magnetic flux lines along the Z direction while allowing the detection element to measure the magnetic flux component along the Y direction generated by the bus bar current, thus eliminating interference while maintaining detection functionality.
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 enhances detection accuracy by shielding external magnetic flux and isolating the measurement object magnetic flux, thereby reducing interference and improving the precision of current measurement.
Implementation Method 1
a magneto-electric conversion element that converts a component of a measurement object magnetic flux in a lateral direction, which is perpendicular to the height direction and the depth direction, to an electric signal
Implementation Method 2
When an external magnetic flux in the lateral direction passes through an accommodation space, which is provided between the first magnetic plate and the second magnetic plate, a trajectory of the external magnetic flux is bent by the first magnetic plate and the second magnetic plate
Data Source
AI summary
A current detection system includes: first and second magnetic plates arranged in parallel with a predetermined distance; a bus bar for flowing current; and a magneto-electric conversion element converting a lateral direction component of a measurement object magnetic flux, generated by current flowing through the bus bar, to an electric signal. When an external magnetic flux in a lateral direction passes through an accommodation space between the first and second magnetic plates, a trajectory of the external magnetic flux is bent by the first and second magnetic plates, and the accommodation space is divided into a permeable space, through which the external magnetic flux passes, and a non-permeable space, through which the external magnetic flux does not pass. The bus bar is arranged in the accommodation space. The magneto-electric conversion element is arranged in the non-permeable space. The bus bar and the magneto-electric conversion element are lined in the height direction.