PCB Planar Coil Layout for Homogeneous Magnetic Field Generation
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Solution Overview
Problem
Conventional magnetic field generators, such as those using permanent magnets or large coil arrangements, are inflexible, space-intensive, and costly, and struggle to generate reproducible homogeneous magnetic fields.
Innovation Solution
A coil arrangement with two planar coil layers, each with multiple windings, generates a parallel magnetic field outside the coil layers, utilizing traces on a printed circuit board to create a homogeneous magnetic field that can be controlled and adjusted for sensor characterization and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional large coil arrangements or permanent magnets are used to generate magnetic fields, then the magnetic field strength is sufficient, but the device becomes space-intensive and costly
Solution Approach 1:
The patent transitions from conventional three-dimensional coil arrangements to a planar two-dimensional coil structure. The coil arrangement is configured with first and second planar coil layers arranged parallel to each other, generating a magnetic field in the z-direction perpendicular to the planar layers. This dimensional change enables compact integration while maintaining magnetic field generation capability, directly resolving the contradiction between magnetic field strength and device space.
2Power
If conventional coil arrangements are used, then magnetic field generation is achieved, but the device lacks flexibility and adaptability for different applications
Solution Approach 1:
The patent implements dynamic control of the magnetic field generator through independent electrical connections to the first and second planar coil layers. This allows the magnetic field strength and characteristics to be adjusted by controlling the current supplied to each layer, enabling adaptation to different measurement ranges and sensor types. The dynamic adjustability directly addresses the contradiction between maintaining magnetic field generation capability and achieving application flexibility.
3Power
If conventional magnetic field generators are used, then magnetic field generation is achieved, but reproducible homogeneous magnetic fields are difficult to generate
Solution Approach 1:
The patent employs local quality optimization by configuring the first and second planar coil layers with specific winding patterns and spacing arrangements. The coil windings are designed to create a homogeneous magnetic field in the target measurement area through careful local arrangement of the conductive traces, while the overall structure maintains compact dimensions. This local optimization of coil geometry directly resolves the contradiction between magnetic field generation and field homogeneity.
4Power
If wire-wound coils are used to generate magnetic fields, then magnetic field generation is achieved, but the device becomes complex and expensive to manufacture
Solution Approach 1:
The patent replaces traditional mechanical wire-wound coil construction with a printed circuit board-based planar coil structure. The coil windings are formed using standard PCB trace technology instead of manual or automated wire winding processes. This substitution dramatically simplifies the manufacturing process, reduces production complexity, and enables cost-effective mass production while maintaining the magnetic field generation function.
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 allows for a cost-effective, robust, and reproducible generation of directional and homogeneous magnetic fields, enabling efficient characterization and calibration of magnetic field sensors, while being less susceptible to external interference.
Implementation Method 1
the coil arrangement is designed to generate a parallel magnetic field at a distance from the first coil layer on the side of the first coil layer facing away from the second coil layer when the coil arrangement is electrically energized
Data Source
AI summary
A device comprising at least one magnetic field generator, which in turn comprises a coil arrangement with multiple coils that have multiple windings each. The invention further relates to a method for providing a coil arrangement for such a device.