Planar Coil Assembly for Thin Handheld Wireless Power
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Solution Overview
Problem
There is a demand for handheld terminals with a thin form factor that require a coil assembly with high wireless power transmission efficiency while minimizing size, as multiple coils are often mounted in these devices for functions like wireless charging, RFID, NFC, and MST.
Innovation Solution
A coil assembly design featuring a connection substrate with a coil pad and an accommodating portion for the coil portion, which includes spiral wiring with an end portion bonded to the coil pad and partially disposed in the accommodating portion, along with an insertion groove for the connection wiring, reducing overall thickness and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional coil structure is used, then wireless power transmission efficiency is maintained, but the coil assembly thickness increases
Solution Approach 1:
The coil structure transitions from a conventional three-dimensional wound configuration to a planar two-dimensional spiral configuration. This dimensional change allows the coil to achieve its functional area in a flat plane, dramatically reducing the thickness dimension while maintaining the necessary wire length and turns for effective electromagnetic coupling and power transmission
Solution Approach 2:
The manual wire winding process is replaced with a printed circuit board (PCB) fabrication process. The coil pattern is directly formed on the PCB substrate through standard PCB manufacturing techniques, eliminating the need for mechanical winding, gluing, and securing operations. This substitution achieves the same electrical function with significantly reduced thickness and improved manufacturing precision
2Adaptability or versatility
If multiple coils are mounted in a handheld terminal, then various functions (wireless charging, RFID, NFC, MST) are enabled, but the device thickness increases
Solution Approach 1:
The planar coil structure serves as a universal platform that can perform multiple functions. By configuring the spiral pattern and electrical connections appropriately, the same basic coil structure can enable wireless power reception, RFID communication, NFC operations, and MST functions, eliminating the need for separate specialized coil assemblies for each function
Solution Approach 2:
Multiple coil structures are integrated onto a single PCB substrate. The planar configuration allows coils to be arranged in the same plane or at different levels of the PCB, enabling multiple functional coils to coexist in a compact space without requiring vertical stacking or separate mounting areas, thus reducing overall device thickness
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 design achieves a significant reduction in coil assembly thickness, enabling efficient wireless power transmission and performance in various functions like RFID, NFC, and MST, while maintaining a thin form factor suitable for handheld terminals.
Implementation Method 1
The coil portion may be configured to perform any one of transmission and reception of electric power for wireless charging, a radio frequency identification (RFID) function, a near field communication (NFC) function, and a magnetic security transmission (MST) function.
Data Source
AI summary
A coil assembly includes: a connection substrate including a coil pad and an accommodating portion disposed in a position adjacent to the coil pad; and a coil portion including a spiral wiring and an end portion bonded to the coil pad, wherein at least a portion of the coil portion is disposed in the accommodating portion.