Bent Busbar Current Detection Device Compact Design
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Solution Overview
Problem
Conventional current detection devices face challenges in detecting large electric currents without compromising productivity, as increasing busbar thickness for higher current detection leads to difficulties in processing and enlarged device dimensions.
Innovation Solution
A current detection device with a thin, bent busbar extending through a ferromagnetic shield member and a current sensor that detects the magnetic field generated by the electric current, allowing for large current detection without increasing the device's lateral dimensions or thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the busbar thickness is increased to detect large electric current, then the current detection capability is improved, but the processing difficulty increases and productivity deteriorates
Solution Approach 1:
The busbar is bent in a specific shape (U-shape or similar configuration) when viewed in the direction of extension, allowing the magnetic field to be concentrated in a smaller lateral dimension while maintaining the same current detection capability. This dimensional transformation enables thin busbars to achieve the same measurement precision as thick busbars would provide in a straight configuration.
Solution Approach 2:
The invention changes the geometric parameters of the busbar from a straight thick configuration to a bent thin configuration. By altering the shape parameter (bending the busbar) while reducing the thickness parameter, the magnetic field distribution is optimized to maintain detection capability for large currents without requiring increased thickness, thus preserving productivity.
2Measurement precision
If the busbar lateral dimension is increased to detect large electric current, then the current detection capability is improved, but the device lateral dimension becomes large
Solution Approach 1:
By bending the busbar in a compact configuration (such as a U-shape) when viewed in the direction of extension, the magnetic field lines are concentrated within a smaller lateral space. This allows the device to detect large currents without requiring a large lateral dimension, as the bent shape confines the magnetic field interaction area while maintaining detection sensitivity.
Solution Approach 2:
The bent busbar configuration allows the busbar to fold back on itself, creating a nested-like structure where the ends of the busbar are positioned close together. This nesting effect concentrates the magnetic field generation within a compact lateral footprint, enabling large current detection without increasing the overall device lateral dimension.
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 the detection of large electric currents without reducing productivity, maintaining a compact design and preventing the need for costly material usage in the shield member, while ensuring accurate and linear current measurement.
Implementation Method 1
a current sensor that detects a magnetic field generated by an electric current flowing in the busbar
Data Source
AI summary
In a current detection device, a busbar extends through the interior of a shield member. The busbar is thin in thickness and yet is bent, when viewed in a direction of extension. A current sensor detects a magnetic field generated by an electric current flowing in the busbar.