Asymmetric Coil Pattern Width for Wireless Power Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing coil components for wireless power transmission systems face challenges in reducing AC resistance and impedance differences due to magnetic field influences, leading to increased losses and heat generation.
Innovation Solution
A coil component design featuring spiral-shaped planar conductors with varying pattern widths and configurations, including radially divided turns and overlapping coil patterns, to optimize inductance and impedance balance, reducing losses and AC resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the coil pattern width is made symmetrical on both inner and outer peripheral sides, then the manufacturing process is simplified, but the AC resistance cannot be reduced sufficiently due to unequal magnetic field intensity distribution
Solution Approach 1:
The patent applies asymmetry by making the coil pattern width different on the inner and outer peripheral sides. Specifically, the pattern width on the inner peripheral side is made smaller than that on the outer peripheral side, which corresponds to the region with stronger magnetic field intensity. This asymmetric design allows for better reduction of AC resistance by adapting the pattern width to the local magnetic field conditions, while still maintaining manufacturing feasibility through a systematic design approach.
2Power
If multiple coil patterns are connected in parallel to increase transmitted power, then the power transmission capability is improved, but impedance differences among coil patterns cause inhomogeneous current density distribution and increased losses
Solution Approach 1:
The patent applies local quality by making each coil pattern have different pattern widths at different radial positions (inner vs. outer peripheral sides). This local variation in pattern width compensates for the impedance differences caused by varying distances from the magnetic sheet, thereby achieving more homogeneous current density distribution among parallel-connected coil patterns and reducing energy losses.
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 design effectively reduces AC resistance and impedance differences, minimizing heat generation and enhancing efficiency in wireless power transmission systems.
Implementation Method 1
by interlinking magnetic flux generated by the transmitting coil with the receiving coil, power is transmitted by wireless
Implementation Method 2
The coil pattern positioned on each of the inner and outer peripheral sides is strongly affected by a magnetic field, so that by reducing the pattern width at this portion
Data Source
AI summary
Disclosed herein is a coil component that includes a coil pattern spirally wound in a plurality of turns. The coil pattern has an innermost turn positioned at an innermost periphery, an outermost turn positioned at an outermost periphery, a middle turn whose turn number counted from the innermost or outermost turn is intermediate among all the turns, and a center position of a line length. The coil pattern is designed such that a pattern width at the center position is larger than pattern widths of the innermost and outermost turns, and that a total or average value of pattern widths of turns positioned between the outermost turn and the middle turn is larger than a total or average value of pattern widths of turns positioned between the innermost turn and the middle turn.