Planar Spiral Coil With Variable Slit Spacing For Wireless Power
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Solution Overview
Problem
Wireless power transmission systems face challenges in achieving high transmission efficiency due to the varying relative positional relationships between power transmitting and receiving coils, which is not adequately addressed by using multiple power transmitting coils with fixed configurations.
Innovation Solution
A coil component with a planar spiral shape, where at least one turn is divided into multiple lines by a spiral slit, allowing adjustable space widths to optimize current density distribution and outer shape, enabling high flexibility in design to match different application product specifications and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a planar spiral conductor is radially divided by a spiral slit, then uneven distribution of current density is reduced and DC resistance or AC resistance is reduced, but the outer shape and inner diameter area cannot be easily adjusted to match different application product specifications
Solution Approach 1:
The patent applies local quality by making the space width between divided lines variable rather than uniform. Specifically, the space width is set to be larger in the radial direction than in the tangential direction, creating different local characteristics in different regions of the coil. This allows the coil to maintain low resistance through proper division while achieving adjustable outer shape and inner diameter area to match different application specifications.
Solution Approach 2:
The patent employs parameter changes by varying the space width between divided lines as a design parameter. By controlling the space width to differ in radial and tangential directions, the patent achieves both reduced resistance (through proper segmentation) and adaptability (through adjustable geometry). This parameter variation allows the same basic structure to serve multiple application requirements.
2Power
If multiple power transmitting coils are used in a wireless power transmission system, then power transmission capability is improved, but transmission efficiency cannot be ensured across different relative positional relationships between transmitting and receiving coils
Solution Approach 1:
The patent applies dynamics by creating a coil structure that can adapt its effective characteristics based on operational requirements. The variable space width design allows the coil to optimize its performance for different relative positions between transmitting and receiving coils. This dynamic adaptability ensures high transmission efficiency across various positional relationships while maintaining the power transmission capability provided by multiple coils.
3Device complexity
If a fixed configuration of power transmitting coils is used, then device complexity is reduced, but the system cannot achieve high transmission efficiency for various application product specifications and shapes
Solution Approach 1:
The patent applies universality by designing a coil structure that can serve multiple application requirements through a single basic configuration. The variable space width between divided lines allows the same coil structure to be adapted for different application product specifications and shapes, eliminating the need for multiple fixed configurations. This multi-functional design maintains simplicity while achieving broad compatibility.
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 design reduces DC and AC resistance, allowing for high transmission efficiency across various product specifications and shapes by adjusting the coil's dimensions and position, ensuring efficient power transfer regardless of the receiving coil's position.
Implementation Method 1
uneven distribution of current density is reduced, allowing a reduction in DC resistance or AC resistance
Data Source
AI summary
Disclosed herein is a coil component that includes a first coil pattern wound in a planar spiral shape. At least one turn constituting the first coil pattern is divided into a plurality of lines by a spiral slit, and a space width between the plurality of lines differs depending on a planar position.