Nested NFC Coil Antennas for Flexible Wireless Charging
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Solution Overview
Problem
Existing NFC wireless charging systems using PCB and 3D antennas suffer from low power transfer efficiency and limited directivity, requiring precise alignment of charging devices.
Innovation Solution
Implementing a coil antenna design where the charging receiver's coil is inserted into the charging transmitter's coil, or vice versa, allowing for 360-degree power transmission and improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If PCB antennas are used for wireless charging, then the device structure is simple and manufacturing is easy, but power transfer efficiency is low and directivity is limited
Solution Approach 1:
The patent implements a nested coil antenna configuration where the receiving antenna coil is inserted into the transmitting antenna coil, or vice versa. This nesting arrangement maximizes magnetic flux linkage between the two coils, significantly improving power transfer efficiency compared to conventional PCB antennas while maintaining a compact form factor suitable for portable devices.
Solution Approach 2:
The patent employs three-dimensional curved or spherical antenna designs instead of flat PCB traces. The curved coil structures create more uniform magnetic field distribution and expand the effective coupling area between transmitting and receiving antennas, thereby enhancing power transfer efficiency without requiring precise alignment.
2Adaptability or versatility
If PCB antennas are used for wireless charging, then manufacturing is easy, but directivity is limited and precise alignment is required
Solution Approach 1:
The three-dimensional curved coil antenna design creates a spherical or omnidirectional radiation pattern that provides 360-degree power transmission capability. This eliminates the directional limitations of flat PCB antennas, allowing devices to be charged from any orientation or position without requiring precise alignment between transmitting and receiving antennas.
Solution Approach 2:
The patent transitions from two-dimensional PCB trace antennas to three-dimensional spatial coil structures. This dimensional enhancement adds vertical and radial coverage, enabling power transmission in multiple directions simultaneously and providing greater positioning flexibility for wireless charging applications.
3Productivity
If coil antenna design is implemented, then power transfer efficiency is improved and 360-degree coverage is achieved, but device complexity increases
Solution Approach 1:
The nested coil configuration integrates both transmitting and receiving antennas within a compact volume by placing one coil inside the other. This nesting approach achieves high power transfer efficiency and 360-degree coverage while minimizing the overall device size, effectively balancing performance improvement with space constraints in portable electronics.
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
Enhances power transfer efficiency beyond 30% and enables wireless charging with flexible device positioning, eliminating the need for precise alignment.
Implementation Method 1
The NFC transmitter provides an electrical signal to a transmitting antenna, which creates an electromagnetic field and induces an electrical signal on a receiving antenna
Data Source
AI summary
The present disclosure is directed to an NFC wireless charging system for electronic devices. The system includes a power transmitting device having a charging transmitter, and a power receiving device having a charging receiver. Each of the charging transmitter and the charging receiver implements a coil antenna design in which the coil antenna charging the power receiver is inserted into the coil antenna of the charging transmitter, or vice versa.