Coil Module Shielding Wall for Wireless Charging and NFC Interference
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Solution Overview
Problem
Portable terminals face challenges in integrating both wireless charging and Near Field Communication (NFC) functions efficiently due to interference between the secondary coil for wireless charging and the NFC antenna, which increases thickness and complicates the fixation of spirally wound coils.
Innovation Solution
A coil module with a shielding member having concentric grooves for spirally wound first and second coils on the same plane, where the shielding member prevents interference between the coils and includes a protrusion for magnetic alignment during charging, allowing both wireless charging and NFC functions without increasing the terminal's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding body is used to prevent interference between the NFC antenna element and the secondary coil, then interference is reduced, but the thickness of the portable terminal increases
Solution Approach 1:
The patent places the first coil and second coil on the same plane within a shared groove of the shielding member, with the shielding wall positioned between them. This nested arrangement allows both coils to coexist in a compact space without requiring additional thickness for separate shielding bodies for each coil, while still maintaining interference prevention through the shielding wall.
2Device complexity
If the secondary coil is utilized as the NFC antenna element, then device complexity is reduced, but wireless charging efficiency and NFC recognition distance cannot be achieved simultaneously
Solution Approach 1:
The patent divides the antenna system into two separate coils: a first coil configured for wireless charging and a second coil configured for NFC communication. Both coils are mounted on the same plane within grooves of a single shielding member, maintaining compact form factor while achieving reliable performance for both functions through proper segmentation and positioning.
3Ease of manufacture
If shielding bodies are formed by rolling to be in a planar form, then manufacturing is simplified, but it is difficult to fix spirally wound coils or antenna elements
Solution Approach 1:
The patent incorporates grooves directly into the shielding member structure at specific locations where coils need to be mounted. These grooves provide localized fixation features that accommodate spirally wound coils, combining the manufacturing simplicity of rolled shielding members with the coil fixation capability without requiring additional complex components.
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
Achieves approximately 71% power efficiency for wireless charging and a recognition distance of 25 mm for NFC, minimizing thickness and enabling simultaneous implementation of both functions without interference.
Implementation Method 1
a shielding member, a shielding wall formed on the shielding member... the shielding wall disposed between the first and second coil
Implementation Method 2
a first coil attached to a surface of the shielding member that faces the inner surface of the external part, and a second coil attached to the surface of the shielding member
Data Source
AI summary
A portable terminal is provided. The portable terminal includes a shielding member attached to an inner surface of an external part, a shielding wall formed on the shielding member, a first coil attached to a surface of the shielding member that faces the inner surface of the external part, and a second coil attached to the surface of the shielding member, with the second coil surrounds the first coil on a same plane and the shielding wall being disposed between the first and second coil.