Wireless Power Receiver Eddy Current Prevention
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Solution Overview
Problem
Existing wireless power transmission systems face efficiency losses and component heating due to eddy currents generated in metallic members by magnetic fields, leading to potential defects in receivers.
Innovation Solution
Incorporating an eddy current prevention mechanism with a plating layer, such as zinc, and a magnet between the reception coil and metallic shielding parts to prevent eddy currents and improve corrosion resistance, thereby enhancing power transmission efficiency and extending component lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metallic members or shielding parts are installed in the wireless power transmitter, then magnetic field shielding is improved, but eddy currents are generated causing power transmission efficiency to deteriorate
Solution Approach 1:
An insulating layer is introduced as an intermediary between the metallic member and the reception coil. This insulating layer prevents direct magnetic coupling that would generate eddy currents in the metallic member, while still allowing the metallic member to provide magnetic field shielding. The insulating layer acts as a mediator that decouples the harmful eddy current generation while preserving the beneficial shielding effect.
Solution Approach 2:
The structure combines multiple materials with different properties: an insulating material layer and a metallic shielding material layer. This composite structure allows the system to simultaneously achieve magnetic field shielding (from the metallic layer) and eddy current prevention (from the insulating layer), resolving the contradiction between shielding effectiveness and power transmission efficiency.
2Object-affected harmful factors
If metallic members are used for magnetic field shielding, then shielding effectiveness is improved, but the metallic members are heated causing component defects
Solution Approach 1:
The insulating layer serves as a thermal and magnetic intermediary that prevents the metallic member from directly interacting with the time-varying magnetic field. By blocking the magnetic flux path through the metallic member, the insulating layer prevents eddy current generation and the subsequent Joule heating that would raise the metallic member's temperature and cause component defects.
3Reliability
If a plating layer is formed using zinc, then corrosion resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The invention specifies forming a plating layer with particular parameters (zinc material selection, thickness range of 1-10 μm) on the insulating layer. By optimizing these parameters, the plating process becomes more controlled and manufacturable while achieving sufficient corrosion resistance. The parameter specification transforms a potentially complex plating operation into a standardized manufacturing step.
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 prevents eddy currents and heat generation in metallic components, improving power transmission efficiency and reducing the risk of defects in wireless power receivers.
Implementation Method 1
power from a transmission coil is transferred to a reception coil and then transferred to a load in a wireless power transmitter
Implementation Method 2
since a plurality of components or a metallic shielding part for shielding the magnetic field is installed in the wireless power transmitter according to the related art, the magnetic flux flowing through the reception coil is absorbed in metallic members
Data Source
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Figure 8~10
AI summary
A wireless power receiver for wirelessly receiving power from a wireless power transmitter according to the embodiment includes a reception coil part resonance-coupled with the wireless power transmitter to receive the power, and an eddy current prevention part disposed at one side of the reception coil part to prevent an eddy current from being generated from the wireless power receiver caused by a magnetic field generated from the reception coil part.