Shielded Wireless Power Transmission Device for Electric Field Leakage
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Solution Overview
Problem
Existing wireless electric power transfer systems based on electric field coupling suffer from electric field leakage around power transmitting electrodes, which poses safety concerns and reduces transmission efficiency due to increased capacitance between the electrodes.
Innovation Solution
A shield structure is employed with a conductive second shield divided into multiple portions and a third shield covering gaps between these portions, reducing capacitance and minimizing electric field leakage while maintaining transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a pair of power transmitting electrodes is used for wireless electric power transfer by electric field coupling, then electric power can be transferred wirelessly, but electric field leakage occurs around the electrodes which reduces safety and transmission efficiency
Solution Approach 1:
A conductive shield is introduced as an intermediary element between the power transmitting electrodes. The shield is connected to ground potential and acts as a mediator to redirect electric field lines, preventing them from leaking into the surrounding environment while maintaining the capacitive coupling between electrodes for power transmission.
Solution Approach 2:
The invention converts the harmful electric field leakage into a beneficial configuration by using the conductive shield to redirect the electric field lines. The shield captures the leaked field lines and redirects them to contribute to the capacitive coupling, thereby converting what was previously harmful leakage into useful power transmission flux.
2Object-affected harmful factors
If a conductive shield is added between power transmitting electrodes to reduce electric field leakage, then safety is improved, but capacitance between the electrodes increases which reduces transmission efficiency
Solution Approach 1:
The conductive shield is designed with non-uniform properties - it is connected to ground at specific locations rather than being uniformly grounded throughout. This local grounding approach creates regions of different electric field distribution, allowing the shield to block leakage in critical areas while maintaining capacitive coupling in power transmission areas.
Solution Approach 2:
The conductive shield is divided into multiple segments or sections, each with different grounding connections. This segmentation allows different portions of the shield to serve different functions - some portions block electric field leakage while others maintain capacitive coupling, thereby resolving the contradiction between safety and transmission efficiency.
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 proposed configuration effectively reduces electric field leakage and improves safety while maintaining transmission efficiency by minimizing capacitance between power transmitting electrodes.
Implementation Method 1
wireless electric power transfer technology for transferring electric power to a mobile product... based on electric field coupling... a pair of power transmitting electrodes and a pair of power receiving electrodes that face each other are used. By providing AC power to the pair of power transmitting electrode, electric power is transferred from the pair of power transmitting electrodes to the pair of power receiving electrodes wirelessly.
Implementation Method 2
the proposed configuration effectively reduces electric field leakage and improves safety while maintaining transmission efficiency by minimizing capacitance between power transmitting electrodes
Data Source
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AI summary
An electric power transmission device includes a first power transmitting electrode, a second power transmitting electrode, a conductive first shield disposed between the first power transmitting electrode and the second power transmitting electrode, a conductive second shield that covers at least one of a first gap between the first power transmitting electrode and the first shield or a second gap between the second power transmitting electrode and the first shield, and a conductive third shield that covers at least one of a plurality of gaps between a plurality of divided portions of the second shield.