Coil Unit Heat Sink Design for Wireless Power Transmission
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Solution Overview
Problem
Existing wireless power transmission systems face issues with heat generation in coil units, which can lead to component failure and inefficient power transmission due to lack of effective heat management.
Innovation Solution
A coil unit design incorporating a spirally wound conductive coil, a capacitor, a magnetic member, a first metal shield, and a second metal shield with a flat plate and flange part to form a heat sink structure, allowing for efficient heat radiation and reduced leakage magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil and capacitor are integrated to reduce size, then the device becomes more compact, but heat dissipation becomes insufficient leading to component failure
Solution Approach 1:
The shield member is divided into multiple functional regions: a capacitor housing part that accommodates the capacitor, and a heat radiating fin part that extends from the housing part to dissipate heat. This segmentation allows the compact integration of components while providing dedicated heat dissipation pathways through the fin structure.
Solution Approach 2:
Heat dissipation is enhanced by extending the shield member into a three-dimensional fin structure perpendicular to the coil plane. The fin part projects from the capacitor housing part, creating additional surface area in the vertical dimension for heat radiation, thereby solving the heat dissipation problem without increasing the horizontal footprint of the compact coil unit.
2Ease of manufacture
If a simple shield structure is used, then manufacturing is easier, but heat radiation efficiency is insufficient
Solution Approach 1:
The shield member incorporates a fin structure that dynamically increases the heat radiating surface area. The fin part extends from the capacitor housing part, creating a structured configuration that enhances heat dissipation capability while maintaining manufacturability through standard metal forming processes.
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 suppresses heat generation and leakage magnetic flux, enhancing power transmission efficiency and preventing component failure while maintaining a compact size.
Implementation Method 1
The flange part is disposed so as to be thermally connected to the first metal shield
Implementation Method 2
capable of efficiently radiating heat
Implementation Method 3
a magnetic member covering the coil in an axial direction of the coil
Implementation Method 4
A wireless power transmission technology that transmits power without using a power cable or cord
Implementation Method 5
The resonance phenomenon is generated by a resonance circuit formed by a coil connected with a capacitor
Data Source
AI summary
Disclosed herein is a coil unit that includes a coil formed by spirally winding a conductive wire, a capacitor electrically connected to the coil, a magnetic member covering the coil in an axial direction of the coil, a first metal shield covering the coil with the magnetic member interposed therebetween, and a second metal shield disposed between the magnetic member and the first metal shield so as to form a space for housing the capacitor. The second metal shield includes a flat plate part facing to the magnetic member, a side wall disposed around the capacitor, and a flange part formed by bending a leading end portion of the side wall extending toward the first metal shield. The flange part is disposed so as to be thermally connected to the first metal shield.