Coil Unit Capacitor Terminal Placement for Magnetic Symmetry
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Solution Overview
Problem
In wireless power transmission devices, positional deviations between primary and secondary coils cause dispersion of magnetic flux, leading to inefficiencies and heat generation due to improper magnetic symmetry and capacitor placement.
Innovation Solution
A coil unit design featuring a spiral-shaped conductor, a capacitor module with strategically positioned terminals, and a magnetic body between the coil and capacitor module to minimize magnetic flux dispersion and heat generation, maintaining magnetic symmetry and improving power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the capacitor module is disposed on the winding center portion of the coil to improve power transmission efficiency, then power transmission efficiency is improved, but the capacitor module generates heat and magnetic flux dispersion occurs in the coil circumferential direction
Solution Approach 1:
The patent repositions the capacitor module from the winding center portion to the circumferential direction of the coil, changing the spatial dimension of capacitor placement. This dimensional shift allows the capacitor to be positioned at locations where magnetic flux density is lower, reducing heat generation while maintaining power transmission efficiency through optimized electrical connection paths.
Solution Approach 2:
The patent applies different connection configurations for different terminals of the capacitor module. One terminal is connected inside the winding portion while the other is connected outside, creating asymmetric local connection qualities. This allows optimal electrical connection in different regions while avoiding concentration of magnetic flux and heat generation at a single location.
2Productivity
If the capacitor module is disposed on the winding center portion of the coil to improve power transmission efficiency, then power transmission efficiency is improved, but dispersion occurs in the magnetic flux generated by the coil in the coil circumferential direction
Solution Approach 1:
The patent moves the capacitor module from the radial center dimension to the circumferential dimension of the coil. This positional change in a different spatial dimension allows the capacitor to be electrically connected to the coil while physically located in regions where it does not disrupt the radial symmetry of magnetic flux distribution, thereby reducing circumferential dispersion.
Solution Approach 2:
The patent employs asymmetric positioning of capacitor terminals relative to the coil winding, with one terminal connected inside the winding portion and the other outside. This asymmetric configuration balances the electrical connection requirements while maintaining magnetic flux symmetry in the circumferential direction, preventing dispersion.
3Reliability
If the capacitor module is disposed on the winding center portion of the coil, then the resonance circuit is formed, but magnetic symmetry of the coil is not considered and dispersion occurs in the magnetic flux
Solution Approach 1:
The patent creates different local connection qualities for the two capacitor terminals: one terminal connects inside the winding portion while the other connects outside. This localized differentiation allows the resonance circuit to function reliably while distributing the electrical connection impacts across different regions, preserving overall magnetic symmetry.
Solution Approach 2:
The patent resolves the conflict between resonance circuit formation and magnetic symmetry by changing the spatial dimension of capacitor placement from radial (center) to circumferential (side). This dimensional transition allows the capacitor to be electrically integrated into the resonance circuit while physically positioned to minimize disruption to magnetic flux symmetry.
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 solution effectively reduces magnetic flux dispersion and heat generation, enhancing power transmission efficiency and stability even with positional deviations, ensuring stable wireless power transmission.
Implementation Method 1
a wireless power transmission technology for transmitting electric power in a wireless manner using an electromagnetic induction mechanism between a primary (power transmission) coil and a secondary (power receiving) coil that face each other
Implementation Method 2
in order to perform power transmission efficiently, configuring a resonance circuit by connecting a capacitor to the primary coil and the secondary coil is known
Implementation Method 3
a magnetic body provided between the coil and the capacitor module
Data Source
AI summary
The coil unit includes a planar coil, a magnetic body and a capacitor module, the capacitor module has a substrate, capacitor elements mounted on the substrate, and a first connecting terminal and a second connecting terminal provided outside an element region on which capacitor elements are mounted, the first connecting terminal is provided inside a winding section as viewed in a plan view, the second connecting terminal is provided outside the winding section as viewed in a plan view, a direction in which the first connecting terminal and the second connecting terminal are connected is perpendicular to a direction in which the conductor extends in the winding section of the planar coil, the coil unit in which the element region is provided in a range overlapping the winding section of the coil as viewed in a plan view is selected.