PCB Bus Bar Vibration Isolation for Magnetic Sensor Precision
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Solution Overview
Problem
Existing printed circuit board assemblies with magnetic sensors struggle to precisely detect current flowing through bus bars due to vibration, leading to unstable control in devices, especially in applications like automobiles, where the board and bus bar vibrate independently, causing imprecise magnetic field detection and subsequent control issues.
Innovation Solution
A printed circuit board assembly design featuring a bus bar in contact with one side and a magnetic sensor on the other, with a varying thickness configuration and a shield surrounded by a holding member to secure the bus bar and sensor, ensuring they vibrate together and maintain precise magnetic field detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic sensor is mounted on a printed circuit board to detect current flowing through a bus bar, then current measurement capability is provided, but the printed circuit board and bus bar vibrate independently causing imprecise magnetic field detection
Solution Approach 1:
The bus bar is integrated directly into the printed circuit board structure, forming a unified rigid connection. This merging eliminates independent vibration between separate components, ensuring the magnetic sensor consistently detects the magnetic field generated by current flow through the integrated bus bar without positional drift or detection errors caused by relative movement.
Solution Approach 2:
The magnetic sensor is pre-positioned and fixed on the printed circuit board at a predetermined location relative to the bus bar. This preliminary positioning ensures that before vibration occurs, the sensor is already in the optimal detection position, and the rigid integration maintains this position during operation, preventing detection errors that would occur with separate vibrating components.
2Measurement precision
If the printed circuit board thickness is reduced in the contact region to improve current detection precision, then measurement accuracy is enhanced, but structural strength may be compromised
Solution Approach 1:
The printed circuit board features a locally optimized thickness profile: the region where the magnetic sensor detects the magnetic field has reduced thickness to minimize magnetic field distortion and enhance detection accuracy, while other regions maintain sufficient thickness to provide necessary structural strength and support. This local differentiation resolves the contradiction between measurement precision and overall structural integrity.
3Measurement precision
If a shield is added to prevent magnetic field interference, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The shield is integrated with the printed circuit board as a unified structure rather than being a separate component. This merging reduces assembly complexity by eliminating the need for separate shield installation steps while maintaining the magnetic field shielding function that prevents interference and enhances detection accuracy.
Solution Approach 2:
The printed circuit board structure serves multiple functions: it provides mechanical support, integrates the bus bar for current conduction, positions the magnetic sensor, and incorporates the shield for magnetic field protection. This multi-functionality reduces the number of separate components needed, simplifying the overall device while maintaining detection 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 configuration allows for precise measurement of current flowing through the bus bar even during vibration, enhancing control stability and reliability in devices by ensuring consistent magnetic field detection.
Implementation Method 1
a sensor mounted on one side of the printed circuit board to detect a magnetic field
Data Source
AI summary
A printed circuit board assembly is disclosed. The printed circuit board assembly includes a printed circuit board, a sensor mounted on one side of the printed circuit board to detect a magnetic field, and a bus bar disposed in contact with another side of the printed circuit board, wherein a thickness between a region of the another side of the printed circuit board, with which the bus bar is in contact, and the one side of the printed circuit board is smaller than a thickness between a remaining region of the another side of the printed circuit board and the one side of the printed circuit board.