Planar Segmented Power Transmission Coil for Stable Wireless Charging
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Solution Overview
Problem
Existing contactless power feed technologies face challenges in efficiently transmitting power without increasing thickness and complexity, particularly due to the need for additional space and complex coil configurations, leading to higher costs.
Innovation Solution
The contactless power feed apparatus employs a transmission coil divided into multiple coaxially arranged partial coils with increasing turns outwardly, and a reception coil with a similar configuration, to stabilize magnetic flux and suppress variations in power transmission efficiency while minimizing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the primary coil is wound from the magnetic body toward the cover to achieve magnetic field resonance, then power transmission capability is improved, but the thickness of the coil increases requiring additional space
Solution Approach 1:
The coil is divided into multiple independent coil units, each with its own winding structure. This segmentation allows each unit to be optimized for minimal thickness while collectively providing the required power transmission capability through combined magnetic field generation.
Solution Approach 2:
The coil winding structure transitions from a traditional thick layered configuration to a planar patterned design on a substrate. By changing the dimensional approach from vertical stacking to horizontal planar arrangement, the thickness is significantly reduced while maintaining effective area for power transmission.
2Loss of energy
If the primary coil is configured with specific winding structure to achieve magnetic field resonance, then power transmission efficiency is improved, but the configuration becomes complicated increasing cost
Solution Approach 1:
The complex mechanical winding process is replaced with a planar patterned wiring structure fabricated on a substrate using standard PCB or thin-film techniques. This substitution eliminates complicated manual or automated winding operations while achieving the same electromagnetic functionality through standardized manufacturing processes.
Solution Approach 2:
The coil design parameters are optimized by adjusting the pattern geometry, trace width, spacing, and layer configuration on the substrate rather than changing winding techniques. These parameter adjustments allow fine-tuning of inductance and magnetic field characteristics without increasing structural complexity.
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 stabilizes magnetic flux and suppresses variations in power transmission efficiency, reducing thickness and complexity, thereby enhancing efficiency and cost-effectiveness.
Implementation Method 1
power is transmitted from a primary side (power transmission side or power supply side) to a secondary side (power reception side) by magnetic field resonance between a coil on the primary side and a coil on the secondary side
Implementation Method 2
a transmission coil that transmits AC power to the power reception device contactlessly
Data Source
AI summary
A winding of a transmission coil included in a power transmission device of a contactless power feed apparatus and serving to transmit AC power to a power reception device contactlessly is formed of a wiring pattern provided on a substrate. The transmission coil is divided into partial coils arranged coaxially. Each of the partial coils is formed such that, among the partial coils, a number of turns of a winding included in a partial coil is larger as the partial coil is located more outwardly.