Earbud Wireless Charging Coil With Magnetic Shielding
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Solution Overview
Problem
Existing wireless earbud charging systems rely on physical interconnect pads that are exposed to the elements, leading to potential damage and corrosion, and do not allow for truly wireless operation, as they require direct electrical contact for charging.
Innovation Solution
A wireless charging system and method utilizing an enclosure with passive magnetic shielding and a coil that receives wireless energy through an electromagnetic field, allowing for inductive charging within a sealed package, eliminating the need for physical contact and providing protection against moisture and dust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical interconnect pads are used for charging, then direct electrical contact is achieved, but the earbuds are exposed to damage by elements and corrosion
Solution Approach 1:
The patent replaces the mechanical contact system (physical interconnect pads) with an electromagnetic field-based wireless charging system. The enclosure contains a coil that generates an electromagnetic field to inductively charge the earbuds, eliminating the need for exposed physical contact points and thereby protecting against elements and corrosion while maintaining charging functionality.
2Reliability
If the enclosure is completely sealed, then protection against elements is improved, but electromagnetic field penetration for charging is blocked
Solution Approach 1:
The patent applies local quality by creating a localized electromagnetic field within the sealed enclosure. The coil is positioned to generate the field in a specific region where the earbuds are placed, allowing energy transfer through the sealed structure without requiring physical openings. This maintains the sealed protection while enabling targeted wireless charging.
3Object-generated harmful factors
If a magnetic shield is added to reduce electromagnetic leakage, then electromagnetic field containment is improved, but wireless energy reception is reduced
Solution Approach 1:
The patent implements a nested structure where the magnetic shield is positioned within the enclosure to contain the electromagnetic field generated by the coil. The shield is strategically placed to block field leakage outward while leaving the internal charging region accessible to the electromagnetic field, thus containing harmful radiation while preserving charging functionality.
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
Enables safe, efficient, and moisture-resistant wireless charging of wireless earbuds by using an enclosure that can operate in both transmit and receive modes, reducing electromagnetic leakage and providing ingress protection, thus enhancing the durability and usability of the earbuds.
Implementation Method 1
receiving, by the coil, wireless energy in response to a placement of the body within an electromagnetic field
Implementation Method 2
The body includes a passive magnetic shielding and a coil
Data Source
AI summary
A system and method for wireless charging a wireless earbud. The wireless earbud having a body that includes a passive magnetic shield and a coil. The coil is wound around a portion of the body comprising the passive magnetic shielding. The wireless earbud receiving wireless energy in response to the placement of the body within an electromagnetic field, which results in the charging of a battery of the wireless earbud.