Electrostatic Shielding Coating for Magnetic Transformer Coupling
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Solution Overview
Problem
Electronic devices face challenges in high voltage environments due to electric field interactions, leading to field intensification and difficulty in providing magnetic coupling for power transfer and signaling, while existing electrostatic shields fail to balance conductivity, thickness, and mechanical stability requirements.
Innovation Solution
An electrostatic shielding element with a conductive coating that allows penetration of a magnetic field by selecting conductivity and thickness to enable power transfer and signaling, using a coating material with conductivity σ and thickness d such that σd² < c, where c is less than 40,000 Sm/s, ensuring protection from electric fields and enabling magnetic field penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductivity of the shielding material is increased to provide an equipotential surface, then electrostatic shielding effectiveness is improved, but induced eddy currents increase which repel incident magnetic flux
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the conductivity σ and thickness d of the conductive coating to satisfy the inequality σd² < c. This parameter optimization allows the coating to provide sufficient electrostatic shielding while limiting eddy current effects, thereby resolving the contradiction between shielding effectiveness and magnetic field penetration.
2Strength
If the thickness of the shield is increased to achieve mechanical stability, then structural strength is improved, but magnetic field penetration is reduced
Solution Approach 1:
The patent resolves this contradiction by optimizing the thickness parameter d of the conductive coating. The thickness is selected to be sufficient for mechanical stability but small enough to satisfy the inequality σd² < c, thereby allowing magnetic fields to penetrate while maintaining structural integrity.
Solution Approach 2:
The patent employs a conductive coating layer applied to a substrate structure, creating a composite shielding element. This composite structure allows the thin conductive coating to provide both mechanical support and electrostatic shielding functionality while minimizing magnetic field interference.
3Object-generated harmful factors
If the conductivity of the shielding material is decreased to reduce eddy currents, then magnetic field penetration is improved, but electrostatic shielding effectiveness is reduced
Solution Approach 1:
The patent resolves this contradiction by optimizing the conductivity parameter σ of the coating material. The conductivity is selected to be high enough to provide effective electrostatic shielding (creating an equipotential surface) but low enough to satisfy the inequality σd² < c, thereby allowing magnetic field penetration.
4Strength
If the thickness of the coating is increased to improve mechanical strength, then structural integrity is improved, but the product σd² increases reducing magnetic field penetration
Solution Approach 1:
The patent resolves this contradiction by optimizing the thickness parameter d of the coating. The thickness is carefully selected to provide sufficient mechanical strength while keeping the product σd² below the threshold c, thereby maintaining both structural integrity and magnetic field penetration capability.
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 effective power transfer and signaling through magnetic fields while protecting electronic devices from electric fields, maintaining mechanical stability and reducing the risk of eddy currents and field intensification.
Implementation Method 1
Electrostatic shielding terminates the electric field lines at a boundary of the shielded region
Implementation Method 2
The conductivity of the shielding material should not be too high in order to avoid induced eddy currents which repel the incident magnetic flux
Data Source
AI summary
The disclosure relates to an electrostatic shielding element arranged on a first axis and comprising an electrostatically shielded volume (at least partially closed by an electrically conductive coating, wherein a thickness and an electrical conductivity of the coating are selected to enable a magnetic field of a predetermined frequency to penetrate the coating, into the volume. The disclosure also relates to an electrostatic shielding arrangement and to a transformer arrangement.