Conductive Shield Overhangs for Wireless Power Coil Eddy Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The placement of electronic circuits near wireless power transfer coils leads to eddy currents induced by magnetic fields, causing power loss and limiting the quality factor (Q) of the coils.
Innovation Solution
Implementing an electrically conductive shield between the coil and the electronic circuit, with optional overhangs on the shield and/or magnetic core to guide magnetic fields away from the circuit, reducing eddy currents and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electronic circuits are placed near wireless power transfer coils, then device integration and compactness are improved, but power loss increases due to eddy currents induced by magnetic fields
Solution Approach 1:
A conductive shield is introduced as an intermediary component between the coil and electronic circuit. The shield intercepts magnetic field lines and guides them away from the electronic circuit through its overhang structure, reducing eddy current induction in the circuit while allowing close proximity placement for compact integration
2Volume of moving object
If electronic circuits are placed near wireless power transfer coils, then device compactness is improved, but quality factor (Q) of the coils deteriorates due to induced eddy currents
Solution Approach 1:
The conductive shield acts as a mediator that protects the coil's magnetic field from interacting with the electronic circuit. By positioning the shield between the coil and circuit, and extending its overhang toward the circuit, the shield captures and redirects magnetic flux, preventing eddy current formation that would otherwise degrade the coil's quality factor
3Loss of energy
If an electrically conductive shield is positioned between the coil and electronic circuit, then power loss is reduced by shielding from magnetic fields, but device complexity increases
Solution Approach 1:
The conductive shield is implemented as a thin planar structure with an overhang, resembling a flexible shell or film. This thin-film approach provides effective magnetic shielding and field guidance while minimizing the added volume, weight, and structural complexity of the device
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
Reduces power loss by up to 70% and maintains high-Q wireless power transfer performance by shielding electronic circuits from magnetic fields.
Implementation Method 1
an electrically conductive shield positioned between the coil and the electronic circuit
Implementation Method 2
A wireless power transfer system can transfer energy wirelessly through magnetic coupling
Implementation Method 3
a magnetic core magnetically coupled to the coil
Data Source
AI summary
Some aspects relate to an apparatus, comprising: a coil; an electronic circuit; and an electrically conductive shield positioned between the coil and the electronic circuit. Some aspects relate to an apparatus, comprising: a coil; an electronic circuit; and a magnetic core magnetically coupled to the coil, the magnetic core having an overhang protruding on a side of the magnetic core facing the electronic circuit.