Hall IC Sensor Unit PCB Layout for EPS
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Solution Overview
Problem
Conventional sensor units for electric power steering systems require lengthy manufacturing processes and have large dimensions due to the use of bent bus bars and projection welding, which increases production time and size.
Innovation Solution
A sensor unit comprising a printed circuit board with a Hall IC and capacitor, eliminating the need for press working and projection welding, and featuring a compact design with the Hall IC arranged parallel to the board, reducing manufacturing time and dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional welding processes (projection welding, resistance welding) are used to assemble Hall IC and capacitor, then electrical connection reliability is improved, but manufacturing time increases significantly
Solution Approach 1:
The patent replaces mechanical welding processes (projection welding, resistance welding) with a printed circuit board-based electrical connection system. The Hall IC and capacitor are mounted on a printed circuit board with conductive patterns that provide electrical connections through soldering or other joining methods, eliminating the need for complex welding assemblies and reducing manufacturing time while maintaining connection reliability.
2Reliability
If Hall IC is mounted with element part perpendicular to the board using bent bus bar, then electrical connection is achieved, but the dimension of the sensor unit becomes large
Solution Approach 1:
The patent changes the mounting orientation of the Hall IC from perpendicular (vertical) to parallel (horizontal) arrangement on the printed circuit board. The element part is positioned parallel to the board surface, allowing the bus bar to be bent into an L-shape that connects to the conductive pattern on the board, thereby reducing the overall dimension of the sensor unit while maintaining electrical connection.
3Strength
If multiple welding processes are used to assemble sensor components, then connection strength is improved, but manufacturing complexity and time increase
Solution Approach 1:
The patent merges the electrical connection function with the mechanical mounting function by integrating the Hall IC and capacitor onto a single printed circuit board. The conductive patterns on the board serve both as electrical pathways and as mounting references, combining multiple functions into one integrated structure that simplifies the manufacturing process while maintaining connection strength.
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
The solution significantly reduces manufacturing time and dimension of the sensor unit, improving detection accuracy and efficiency by eliminating unnecessary welding processes and utilizing a compact printed circuit board layout.
Implementation Method 1
The torque detecting device detects a change in the torque as a change in magnetic flux passing through the Hall IC.
Data Source
AI summary
A sensor unit includes a printed circuit board, a Hall IC, a terminal member, and a capacitor. The printed circuit board has a conductive pattern. The Hall IC is disposed on the printed circuit board. The Hall IC includes an element part that detects magnetic flux. The element part is arranged in parallel with the printed circuit board and is away from the conductive pattern. The terminal member is disposed on an end portion of the printed circuit board and is configured to be electrically coupled with an external device. The capacitor is disposed on the printed circuit board.