Wireless Charging Shielding Member for Electromagnetic Field Protection
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Solution Overview
Problem
Conventional non-contact wireless power charging systems face issues such as fire hazards due to connector contact problems, reduced charging efficiency, and damage from electromagnetic fields, which can lead to malfunction and decreased battery life.
Innovation Solution
A wireless power charging system with shielding and eddy current reducing members in the primary and secondary cores to protect both the charging system and battery pack from electromagnetic fields, using a combination of polyurethane and sendust for shielding and a net-shaped polyester with zinc-nickel composition to reduce eddy currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-contact wireless power charging system is used, then connector contact problems and fire hazards are eliminated, but electromagnetic field damage and charging efficiency loss occur
Solution Approach 1:
A shielding member made of ferromagnetic material is introduced as an intermediary between the primary and secondary coils to block and guide magnetic flux, preventing electromagnetic field damage to electronic components while maintaining wireless power transfer functionality
Solution Approach 2:
The patent converts the harmful electromagnetic field into a beneficial controlled magnetic flux path by using the shielding member to direct magnetic lines of force through designated pathways, transforming potential damage into efficient power transfer while protecting surrounding components
2Productivity
If metal is placed inside the effective radius of the generated magnetic field, then wireless charging function is enabled, but electricity loss in primary coil increases due to magnetic field changes
Solution Approach 1:
The shielding member is strategically positioned only in specific areas where magnetic flux concentration occurs, creating local magnetic pathways that reduce overall energy loss while maintaining charging functionality in the effective radius area
3Reliability
If shielding member is added to protect from electromagnetic field, then component protection is improved, but device complexity increases
Solution Approach 1:
The shielding member is implemented as a thin ferromagnetic sheet or coating that can be integrated into the existing coil structure, providing electromagnetic protection without significantly increasing device complexity or volume
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 solution provides stable and efficient charging capacity, maintaining battery temperature and extending the battery pack's life through 500 charge/discharge cycles without overheating or significant capacity loss, while preventing connector-related issues and electromagnetic damage.
Implementation Method 1
The battery is charged with the induced electricity from the induced electromotive force of the secondary coil by the generated magnetic field from the primary coil
Implementation Method 2
protect both the charging system and a battery pack from the electromagnetic field... installing a shielding member and an eddy current reducing member respectively in both a primary core of a wireless power transmission apparatus and a secondary core of a wireless power receiving apparatus
Data Source
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AI summary
A non-contact power charging system includes a wireless power transmission apparatus 10 for transmitting a power signal from a primary core 14 via a resonant converter 13 by the control of a transmission control unit 12; and a wireless power receiving apparatus 20 for receiving the power signal transmitted from the primary core 14 of the wireless power transmission apparatus 10 via a secondary core 24 and charging a battery cell by the control of a receiving control unit. The wireless power receiving apparatus 20 includes a receiving shield panel and an eddy current reducing member in the side of the secondary core 24 to shield an electromagnetic field generated from the secondary core 24, to thereby protect the charging system and the battery pack from the electromagnetic field.