Coil Module With Permeability-Graded Plate For Wireless Power
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Solution Overview
Problem
Wireless power transmission devices with overlapping coils face limitations in achieving equal inductance levels, requiring separate resonant tanks and complex configurations due to differing magnetic permeability areas on the magnetic substance plate.
Innovation Solution
A coil module design with a magnetic substance plate having areas of different magnetic permeability, where coils are positioned to ensure equal inductance levels by varying their overlap and distance from the plate, connected in parallel with a common capacitor to form resonant circuits with the same resonance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coils are configured to overlap to prevent shadow areas during magnetic coupling, then wireless power transmission efficiency is improved, but inductance levels of each coil become different requiring separate resonant tanks
Solution Approach 1:
The magnetic substance plate is divided into multiple areas with different magnetic permeability values. Specifically, a first area has a first magnetic permeability, a second area has a second magnetic permeability, and a third area has a third magnetic permeability. This local variation in magnetic properties allows each coil to achieve its required inductance level despite overlapping configurations, enabling equal inductance levels with a single resonant tank.
Solution Approach 2:
The invention changes the magnetic permeability parameter of the magnetic substance plate in different spatial areas. By adjusting the magnetic permeability values (μ1, μ2, μ3) in different areas, the inductance of overlapping coils can be equalized. This parameter modification allows the system to maintain equal inductance levels while preserving the overlapping coil configuration for efficient power transmission.
2Reliability
If separate resonant tanks are configured for each coil to accommodate different inductance levels, then each coil can operate at optimal resonance, but manufacturing cost and device complexity increase
Solution Approach 1:
The magnetic substance plate incorporates areas with different magnetic permeability values positioned strategically beneath each coil. This local differentiation in magnetic properties ensures that each coil achieves the same inductance level despite overlapping, allowing all coils to share a common resonant tank with identical resonance characteristics, thereby reducing manufacturing complexity and cost.
Solution Approach 2:
The invention merges multiple resonant tanks into a single common resonant tank by ensuring all coils have equal inductance levels through the magnetic substance plate's differentiated areas. This consolidation reduces the number of components, simplifies manufacturing, and lowers costs while maintaining optimal resonance for each coil.
3Device complexity
If coils are positioned at different locations on the magnetic substance plate to avoid overlap, then inductance levels can be equalized, but shadow areas are generated reducing magnetic coupling efficiency
Solution Approach 1:
The magnetic substance plate is designed with spatially varying magnetic permeability across different areas. This allows coils to overlap in space while still achieving equal inductance levels, as each coil interacts with regions of appropriate magnetic permeability. The overlapping configuration eliminates shadow areas and improves magnetic coupling efficiency.
Solution Approach 2:
By modifying the magnetic permeability parameter in different areas of the magnetic substance plate, the invention enables overlapping coil configurations to maintain equal inductance levels. This parameter adjustment resolves the conflict between coil overlap (for efficiency) and inductance equality (for simplicity).
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 allows for efficient wireless power transmission by ensuring equal inductance levels across coils, facilitating the formation of multiple resonant circuits using a single common capacitor, reducing manufacturing costs and enabling miniaturization of the device.
Implementation Method 1
a magnetic substance plate including a first area having a first magnetic permeability and a second area having a second magnetic permeability
Implementation Method 2
wireless power transmission technology allowing an electronic device to be charged with power, even in a state of non-contact between the electronic device and a wireless power transmission device
Implementation Method 3
resonant tanks need to be separately configured for each coil
Data Source
AI summary
A coil module includes a magnetic substance plate, a first coil, and a second coil. The magnetic substance plate includes a first area having a first magnetic permeability and a second area having a second magnetic permeability. The first coil is disposed on a surface of the magnetic substance plate. The second coil is disposed on the surface of the magnetic substance plate and partially overlapping the first coil. A portion of the first coil, not overlapping the second coil, is disposed on a surface of the first area, and a portion of the second coil, not overlapping the first coil, is disposed on a surface of the second area.