Current Sensor Device Position Stability via Direct Bus Bar Mounting
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Solution Overview
Problem
Current sensor devices face accuracy issues due to deviations in the relative position between the magneto-electric conversion element and the bus bar caused by temperature changes and vibrations, leading to decreased current detection accuracy.
Innovation Solution
A current sensor device design where the sensor package with the magneto-electric conversion element is directly fixed to the bus bar without interposing a printed circuit board, using a resin element to hold the magnetic shield body and bus bar, preventing relative position deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a printed circuit board is interposed between the magneto-electric conversion element and the bus bar, then electrical connection is achieved, but relative position deviation occurs due to temperature changes and vibrations
Solution Approach 1:
The patent removes the printed circuit board from the structure, directly mounting the magneto-electric conversion element on the bus bar. This extraction eliminates the intermediate component that causes position deviation, thereby maintaining both electrical connection and detection accuracy simultaneously.
Solution Approach 2:
The patent combines the magneto-electric conversion element directly with the bus bar structure, eliminating the separation introduced by the printed circuit board. This merging ensures stable relative positioning while maintaining electrical connection, resolving the contradiction between connection reliability and measurement precision.
2Ease of manufacture
If the magneto-electric conversion element is mounted on a printed circuit board, then electrical connection is established, but relative position stability deteriorates under environmental changes
Solution Approach 1:
The printed circuit board is removed from the assembly, eliminating the source of position instability. The magneto-electric conversion element is directly integrated with the bus bar, ensuring stable relative positioning while maintaining ease of manufacture through simplified assembly steps.
Solution Approach 2:
The patent changes the mounting structure from a multi-component assembly (element on PCB) to a direct integration (element on bus bar). This structural parameter change eliminates thermal expansion and vibration-induced position deviations, improving stability while maintaining manufacturability.
3Strength
If a resin housing holds the bus bar and magnetic shield body, then structural support is provided, but position deviation occurs under thermal and mechanical stress
Solution Approach 1:
The patent removes the resin housing from the critical positioning path between the magneto-electric conversion element and the bus bar. By directly mounting the element on the bus bar, the design eliminates the position deviation caused by resin housing deformation under thermal and mechanical stress, while the housing continues to provide overall structural support.
Solution Approach 2:
The patent applies different functional requirements to different parts: the resin housing provides overall structural support and protection, while the direct mounting of the magneto-electric conversion element on the bus bar ensures precise local positioning. This local quality differentiation resolves the contradiction between structural strength and position accuracy.
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 design enhances current detection accuracy by maintaining the relative position between the magneto-electric conversion element and the bus bar, reducing the impact of environmental changes and improving signal detection while also enhancing connection reliability and magnetic field shielding.
Implementation Method 1
a magneto-electric conversion element which detects a current flowing through the bus bar
Implementation Method 2
a magnetic shield body that shields the magneto-electric conversion element from an external magnetic field
Data Source
AI summary
A current sensor device includes: at least one bus bar; at least one sensor package that includes a magneto-electric conversion element which detects a current flowing through the bus bar and an external connection terminal which is electrically connected to the magneto-electric conversion element; a printed circuit board that is disposed on the sensor package opposite to the bus bar, and electrically connected to the terminal; a magnetic shield body that shields the magneto-electric conversion element from an external magnetic field; and a resin element that integrally holds at least a part of the magnetic shield body and the bus bar fixed to the sensor package.