Current Detecting Device Shield Plate Recessed Design
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Solution Overview
Problem
Conventional current detecting devices experience output errors due to the exposure of U-shaped shield plates, which allow magnetic substances to approach the opening portion, affecting detection accuracy.
Innovation Solution
A current detecting device with a U-shaped shield plate arrangement where the leading ends of the side plates are recessed within the outer frame portion, creating a predetermined distance from the opening edge, and a nonmagnetic cover is used to protect the exposed connecting plate, preventing magnetic interference and physical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a U-shaped shield plate is used to shield the magneto-electric converting element, then magnetic shielding effectiveness is improved, but output error increases when magnetic substances approach the opening portion
Solution Approach 1:
The patent introduces an auxiliary plate as an intermediary component positioned between the magnetic substance and the shield plate opening. This auxiliary plate serves as a mediator that blocks the direct path of magnetic field lines to the opening portion, preventing magnetic substances from interfering with the magneto-electric converting element while maintaining the shield plate's protective function.
2Ease of manufacture
If the leading ends of the side plates project outside the housing, then the shield plate can be easily attached, but magnetic substances can excessively approach the opening portion
Solution Approach 1:
The patent extends the protection in a new spatial dimension by adding the auxiliary plate that protrudes from the housing outer surface. This creates an additional protective barrier in the direction toward potential magnetic substances, complementing the original shield plate structure and preventing excessive approach of magnetic substances to the opening portion.
3Device complexity
If the shield plate is exposed to the outside, then the structure is simple, but physical impacts and magnetic interference affect detection accuracy
Solution Approach 1:
The patent divides the protective function into two separate components: the original shield plate for magnetic shielding and the additional auxiliary plate for physical protection and enhanced magnetic blocking. This segmentation allows each component to specialize in its protective function while maintaining overall structural simplicity and improving detection stability.
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 reduces output errors by preventing excessive magnetic influence and physical impacts on the shield plate, ensuring stable and accurate current detection.
Implementation Method 1
a magneto-electric converting element 250 which outputs an electric signal in response to a magnetic field generated by the current flowing through the busbar 230
Implementation Method 2
The magneto-electric converting element 250 is arranged close to the busbar 230, and outputs an electric signal in response to a magnetic field generated by the current flowing through the busbar 230
Implementation Method 3
a shield plate 260 for magnetic shield is attached to a main body portion 226 of the housing 220 so as to surround the magneto-electric converting element 250 and a part 231 of the busbar opposing to the magneto-electric converting element 250
Data Source
Figure 1
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AI summary
A current detecting device includes a busbar, a magneto-electric converting element that outputs a signal in response to a magnetic field generated from the busbar, a housing that accommodates the busbar and the magneto-electric converting element, and a shield plate that is attached to the housing so as to surround the magneto-electric converting element and a part of the busbar. The shield plate is formed in the U-shape in cross section in which an opening is formed between leading ends of a pair of side plates. The leading ends of the pair of side plates of the shield plate are located more inside than an opening peripheral edge of an opening portion of the outer frame portion so that a predetermined distance is secured between the leading ends of the pair of side plates of the shield plate and the opening peripheral edge of the opening portion of the outer frame portion.