Wireless Power Coil Shielding for Metal Debris Heat Suppression
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Solution Overview
Problem
In wireless power transmission systems, metal foreign substances between power transmission and reception coils can generate heat, posing safety risks, especially during high-output non-contact charging of electric vehicles, as conventional removal methods are inadequate for all types of foreign substances and may not completely prevent heat generation.
Innovation Solution
A power transmission device with a magnetically shielded space created by a power transmission-side cancel coil outside the power transmission coil, a moving member, and a moving mechanism that relocates metal foreign substances from the power transmission coil area into the magnetically shielded space to prevent heat generation during high-output power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-output non-contact power transmission is performed, then power transmission efficiency is improved, but metal foreign substances generate heat causing safety risks
Solution Approach 1:
The patent extracts metal foreign substances from the harmful high magnetic flux density area by using a wiper to move them from the power transmission coil area to a peripheral area with lower flux density. This separates the foreign substances from the source of harmful heating while maintaining high-output power transmission capability
Solution Approach 2:
The patent introduces a wiper as an intermediary mechanism that physically transports metal foreign substances away from the power transmission coil. This mediator enables the removal of harmful substances without interrupting the high-output power transmission process
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
Effectively suppresses heat generation from metal foreign substances in the peripheral area of the power transmission device, enabling safe and continuous high-output non-contact power transmission by relocating foreign substances outside the magnetically shielded area.
Implementation Method 1
a magnetically shielded space created by a power transmission-side cancel coil arranged outside the power transmission coil
Implementation Method 2
a power transmission coil
Data Source
AI summary
A power transmission device includes a power transmission coil, a magnetically shielded space created by a power transmission-side cancel coil arranged outside the power transmission coil, a moving member configured to move a metal foreign substance, and a moving mechanism configured to move a part or all of an upper surface of the moving member from an area outside the magnetically shielded space into the magnetically shielded space.