Low Inductance Pad Winding Using Matched Spiral Coils
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Solution Overview
Problem
Conventional high-power wireless power transfer systems require high voltages, leading to increased costs and voltage hazards, necessitating a method to reduce voltage requirements while maintaining efficient power transfer.
Innovation Solution
The use of a dual-coil configuration with each coil wound in a spiral pattern around a center point, connected in parallel, and accompanied by a ferrite structure to enhance magnetic coupling, reduces inductance and voltage requirements, allowing for lower voltage operation without compromising power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional high-power wireless power transfer systems are used, then power delivery capability is improved, but voltage requirements increase leading to higher costs and safety hazards
Solution Approach 1:
The patent divides a single high-inductance coil into multiple smaller coils (typically three coils arranged in a triangular pattern), each with lower individual inductance. These segmented coils are connected in parallel to achieve the desired power delivery capability while maintaining lower voltage requirements, thereby resolving the contradiction between power capability and voltage safety.
Solution Approach 2:
The patent combines multiple low-inductance coils in parallel configuration to achieve high-power wireless power transfer. By merging the current-carrying capacity of multiple coils while maintaining low individual inductance values, the system delivers high power without requiring high voltages, thus resolving the contradiction between power delivery and voltage hazards.
2Power
If high voltage is used for high-power wireless power transfer, then power delivery is improved, but system complexity and cost increase
Solution Approach 1:
The patent segments the power delivery function across multiple low-voltage coils instead of using a single high-voltage coil. This segmentation allows the use of lower voltage-rated components throughout the system, reducing overall system complexity and cost while maintaining high power delivery capability through parallel current summation.
Solution Approach 2:
The patent changes the electrical parameters of the system by using multiple coils with lower individual inductance and voltage ratings. By adjusting the number of coils, their individual inductance values, and their parallel configuration, the system achieves high power delivery with lower voltage parameters, thereby reducing component requirements and system complexity.
3Device complexity
If single coil configuration is used, then device simplicity is maintained, but inductance and voltage requirements become excessively high
Solution Approach 1:
The patent applies segmentation by dividing a single coil into multiple smaller coils arranged in a specific geometric pattern (typically triangular). This segmentation reduces the inductance of each individual coil while the parallel connection maintains overall current capacity, thereby reducing voltage requirements without significantly increasing device complexity.
Solution Approach 2:
The patent transitions from a single-dimensional coil configuration to a multi-dimensional spatial arrangement of multiple coils (e.g., triangular pattern in a plane). This dimensional change allows the system to achieve the desired electrical characteristics through spatial distribution rather than increasing the size or turns of a single coil, thus reducing inductance and voltage requirements with minimal complexity increase.
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 reduces the voltage needed for wireless power transfer, minimizing costs and safety risks while maintaining efficient power transfer, and eliminates the need for transformers by allowing designers to use lower voltage-rated components.
Implementation Method 1
accompanied by a ferrite structure to enhance magnetic coupling
Implementation Method 2
inductive wireless power transfer
Data Source
AI summary
An apparatus for wireless power charging includes a first charging coil with a first conductor arranged in a winding pattern with a first winding around a center point and each successive winding of the first charging coil is further away from the center point than the first winding and any previous windings. A second charging coil includes a second conductor wound with respect to the first charging coil where each coil of the second charging coil is arranged between each winding of the first charging coil. The first charging coil and second charging coil are connected in parallel. A ferrite structure is positioned adjacent to the first charging coil and the second charging coil.