Planar Coil Proximity Switch Layout for Stable Zero State
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Solution Overview
Problem
Existing proximity switches face challenges with stability of the zero state and interference issues, which affect their accuracy and reliability in detecting targets.
Innovation Solution
A proximity switch design featuring a coil arrangement with at least two receiving coils and one transmitting coil, all planar coils arranged in a common coil plane within a single copper layer, oriented perpendicular to the longitudinal axis, and connected in a series configuration to minimize interference and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional coil arrangements with multiple layers or encircling configurations are used, then the structural complexity is reduced, but interference increases and zero state stability deteriorates
Solution Approach 1:
The coil arrangement is segmented into distinct functional groups: transmitting coils and receiving coils, with each group spatially separated. The receiving coils are further divided into multiple individual coils arranged in a specific pattern rather than encircling the transmitting coil, reducing mutual interference while maintaining detection capability.
Solution Approach 2:
The coils are arranged in a planar configuration within a single copper layer rather than using multiple layers or three-dimensional encircling structures. This two-dimensional arrangement reduces interference while maintaining the magnetic field coupling necessary for operation.
2Reliability
If coils are arranged in a common plane within one copper layer, then interference is reduced and zero state stability improves, but manufacturing complexity increases
Solution Approach 1:
Multiple coils (transmitting and receiving) are merged into a single copper layer, eliminating the need for multiple layers and complex inter-layer connections. This simplifies the manufacturing process while achieving the desired interference reduction through careful spatial arrangement within the plane.
3Power
If receiving coils enclose transmitting coils circumferentially, then coupling efficiency is improved, but interference increases
Solution Approach 1:
The receiving coils are positioned to detect magnetic field changes in specific local regions rather than encircling the transmitting coil. This localized arrangement maintains sensitivity to target-induced field changes while reducing mutual interference between coils.
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 proposed design achieves a more stable zero state and reduced interference, leading to improved accuracy and reliability in detecting targets, even at industrially usual detection distances.
Implementation Method 1
A proximity switch comprises a coil arrangement having at least two receiving coils and at least one transmitting coil
Implementation Method 2
the at least two receiving coils and the at least one transmitting coil are planar coils and are arranged in a common coil plane
Data Source
AI summary
A proximity switch, comprising a coil arrangement including at least two receiving coils and at least one transmitting coil, and a control and evaluation unit arranged downstream of the coil arrangement, the control and evaluation unit being configured to obtain a switching signal when a target approaches a predefined response distance of the proximity switch. The at least two receiving coils and the at least one transmitting coil are planar coils and are arranged in a common coil plane being arranged completely within one single copper layer. The common coil plane is oriented perpendicular to a longitudinal axis of the proximity switch. The at least two receiving coils and the at least one transmitting coil do not overlap one another in the direction of the longitudinal axis and do not enclose one another circumferentially.