Non-contact Power Coil with Non-uniform Conductor Pattern
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Solution Overview
Problem
Non-contact power transmission efficiency between power transmitting and receiving coils decreases significantly with changes in their relative positions, particularly due to variations in distance and alignment, leading to inefficiencies in power transfer.
Innovation Solution
A non-contact power transmitting coil with a conductor pattern having non-equidistant intervals and varying line widths between adjacent pattern portions, allowing for a more uniform magnetic and electric field distribution, thereby maintaining high efficiency regardless of the power receiving coil's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional equidistant conductor pattern is used, then the manufacturing process is simple, but the power transmission efficiency decreases significantly with changes in relative positions between transmitting and receiving coils
Solution Approach 1:
The conductor pattern is designed with non-uniform characteristics: intervals between adjacent pattern portions vary along the winding direction, and line widths of adjacent pattern portions differ. This local variation in geometric parameters creates a magnetic field distribution that compensates for positional deviations, maintaining high power transmission efficiency across different receiving coil positions without requiring complex active control systems.
Solution Approach 2:
The conductor pattern deliberately introduces asymmetry by varying both the intervals and line widths of adjacent pattern portions. This asymmetric design breaks the uniformity of conventional equidistant patterns, creating a magnetic field profile that is more robust to positional changes. The asymmetric structure allows the field to maintain sufficient coupling strength across a broader range of positions, resolving the contradiction between efficiency and position sensitivity.
2Loss of energy
If the intervals between adjacent pattern portions are uniform, then the conductor pattern is easier to manufacture, but the magnetic field distribution becomes non-uniform leading to position-dependent efficiency
Solution Approach 1:
The conductor pattern implements local quality variations by setting different intervals between adjacent pattern portions and different line widths for each portion. This controlled non-uniformity is designed to create a more uniform effective magnetic field distribution across the transmitting surface, thereby maintaining consistent power transmission efficiency regardless of receiving coil position. The manufacturing complexity is managed by defining clear geometric progression rules for the intervals and line widths.
3Loss of energy
If the line widths of adjacent pattern portions are identical, then the manufacturing process is simplified, but the power transmission efficiency varies with the position of the receiving coil
Solution Approach 1:
The conductor pattern design assigns different line widths to adjacent pattern portions, creating local variations in current distribution and magnetic field strength. This local quality control compensates for positional deviations of the receiving coil, ensuring that power transmission efficiency remains consistently high across the entire transmitting surface. The design complexity is offset by the significant improvement in efficiency stability.
Solution Approach 2:
By introducing asymmetric line width variations across adjacent pattern portions, the design creates a magnetic field profile that is inherently more robust to position changes. This asymmetric geometry ensures that even when the receiving coil is offset from the center, sufficient magnetic coupling is maintained, thereby resolving the position-dependent efficiency problem.
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 ensures consistent power transmission efficiency across the entire power transmitting surface, providing a high degree of position freedom for the power receiving coil with efficiencies ranging from 84% to 90%, reducing the impact of positional deviations on power transfer.
Implementation Method 1
A non-contact type power supplying apparatus may supply power to the battery provided in the electronic apparatus in a non-contact manner using, for example, a magnetic induction effect or a magnetic resonance effect
Implementation Method 2
A non-contact type power supplying apparatus may supply power to the battery provided in the electronic apparatus in a non-contact manner using, for example, a magnetic induction effect or a magnetic resonance effect
Data Source
AI summary
A non-contact type power transmitting coil may include at least one conductor pattern disposed on at least one surface of a base having a predetermined area, having a plurality of turns, and transmitting received power externally in a non-contact manner. The intervals between at least some of adjacent pattern portions of the conductor pattern in a direction from a center portion of an inner diameter of the conductor pattern to an outermost pattern portion conductor pattern may be different from one another.