Resonance Power Transfer Coil with Interlayer Insulation
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Solution Overview
Problem
Conventional resonance-type power transfer coils with a two-layered spiral conductor configuration face challenges in downsizing due to increased parasitic capacitance, which affects impedance characteristics and power transmission efficiency, especially at MHz operating frequencies.
Innovation Solution
A resonance-type power transfer coil with a conductor wound into a multiple-layered helical shape and an insulating member provided between layers to reduce parasitic capacitance, allowing for downsizing while maintaining efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of turns in the coil is increased to increase inductance, then inductance increases, but parasitic capacitance between conductor portions increases and resonance characteristic deteriorates
Solution Approach 1:
The conductor is divided into multiple layers with insulating members inserted between them, segmenting the continuous conductor structure. This segmentation reduces the parasitic capacitance between adjacent conductor portions by introducing insulating barriers, while still maintaining the required number of turns for sufficient inductance.
Solution Approach 2:
Insulating members are introduced as intermediary elements between adjacent layers of the conductor. These insulating members act as mediators that reduce the direct capacitive coupling between conductor portions, thereby reducing parasitic capacitance while allowing the coil to maintain its inductance through multiple turns.
2Length of stationary object
If the conductor is wound into a two-layered spiral shape with alternating layers, then coil thickness is reduced, but area in width direction becomes large
Solution Approach 1:
The patent transitions from a planar two-layered spiral configuration to a three-dimensional multiple-layered helical structure. By stacking multiple layers in the vertical dimension and using insulating members to separate them, the design achieves compact thickness while containing the width area through optimized layer arrangement and insulation.
3Stability of the object's composition
If the first layer and second layer of conductor are alternately arranged in parallel, then distance between layers is maintained constant, but parasitic capacitance effect in center portion differs from outer peripheral portion affecting impedance characteristic
Solution Approach 1:
The patent applies different structural characteristics to different regions of the coil. By using multiple layers with insulating members, the local parasitic capacitance is reduced and more uniformly distributed across the coil structure, addressing the non-uniform impedance characteristic that arose from the alternating parallel layer arrangement.
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 configuration achieves downsizing and reduces parasitic capacitance between layers, improving impedance characteristics and power transmission efficiency, even at MHz frequencies.
Implementation Method 1
parasitic capacitance (stray capacitance) between portions of the conductor increases
Implementation Method 2
an insulating member provided between layers of the conductor
Implementation Method 3
resonance-type power transfer system operating at an operating frequency in a MHz band
Implementation Method 4
resonance-type power transfer coil
Data Source
AI summary
A conductor (31) wound into a multiple-layered helical shape, and an insulating member (32) provided between layers of the conductor are provided.