Inductive Position Sensor PCB Layout for EMI-Resistant Sensing
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Solution Overview
Problem
Existing inductive position sensor devices for electric machines require additional shielding layers to mitigate electromagnetic interference, increasing production costs and reducing design compactness.
Innovation Solution
The coils and computing unit are disposed on different planes of a printed circuit board with connection lines extending parallel to each other, eliminating the need for shielding layers and optimizing signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shielding layers are added to mitigate electromagnetic interference, then signal integrity is improved, but production costs increase and device complexity increases
Solution Approach 1:
The patent extracts and removes the shielding layers from the printed circuit board design. By carefully routing the connection lines parallel to each other and optimizing their layout, the design eliminates the need for additional shielding layers while maintaining signal integrity, thus reducing device complexity and production costs.
Solution Approach 2:
The patent changes the routing parameters of the connection lines, specifically making them extend parallel to each other rather than crossing or running perpendicular. This parameter change in the connection line geometry reduces electromagnetic interference without requiring shielding layers, resolving the contradiction between signal integrity and device complexity.
2Reliability
If shielding layers are added to mitigate electromagnetic interference, then signal integrity is improved, but production costs increase
Solution Approach 1:
The patent removes the shielding layers from the manufacturing process. By optimizing the connection line routing to extend parallel to each other, the design achieves signal integrity without the need for expensive shielding layers, directly reducing production costs while maintaining reliability.
3Adaptability or versatility
If connection lines are routed non-parallel to connect computing unit to coils, then routing flexibility is improved, but electromagnetic interference increases
Solution Approach 1:
The patent changes the routing parameter from non-parallel to parallel arrangement of connection lines. This parameter change reduces electromagnetic interference between the connection lines while still providing adequate routing flexibility to connect the computing unit to the coils on the printed circuit board.
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 electromagnetic interference, enhances signal linearity, and lowers production costs while maintaining a compact design.
Implementation Method 1
at least one transmitter coil for generating electromagnetic waves and comprising at least one receiver coil for detecting the electromagnetic waves generated by the transmitter coil and influenced by the coupling element
Implementation Method 2
The parallel implementation minimizes the induction in the region of the connection lines, which prevents an offset in the output signal and thus optimizes the measurement result
Data Source
AI summary
An inductive position sensor device for detecting the position of a coupling element which can be arranged on a movable actuator element of an electric machine is disclosed. The inductive position sensor device includes (i) at least one transmitter coil for generating electromagnetic waves, (ii) at least one receiver coil for detecting the electromagnetic waves which are generated by the transmitter coil and are influenced by the actuator element, and (iii) a computing unit which is designed to actuate the transmitter coil and evaluate the electromagnetic waves detected by the receiver coil in order to determine the position. The coils are arranged on a front face of a common printed circuit board, and the computing unit is arranged on a rear face of the common printed circuit board. The coils are electrically connected to the computing unit by connection lines which extend along the printed circuit board and through the printed circuit board. The connection lines run substantially parallel to one another.