Wireless Charging PCB Layout With Integrated NFC and Coils
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Solution Overview
Problem
Existing wireless charging technologies face inefficiencies due to misalignment issues during charging, particularly in automotive applications, and the integration of NFC technology increases the distance between charging coils, reducing efficiency.
Innovation Solution
A wireless charging printed circuit board design that integrates an NFC antenna and charging coils on the same layer, utilizing multiple layers with electric field shielding, primary and auxiliary coils, and a ferrite sheet to enhance efficiency and heat dissipation, while maintaining a compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NFC board is integrated into wireless charger, then NFC functionality is added, but thickness increases and distance between coils increases reducing charging efficiency
Solution Approach 1:
The patent combines the NFC antenna and charging coil patterns on the same PCB layer, eliminating the need for a separate NFC board. This merging approach maintains NFC functionality while reducing overall thickness and minimizing the distance between transmit and receive coils, thereby preserving charging efficiency.
Solution Approach 2:
The patent transitions from a vertical stacking approach (separate NFC board layered over the charging coil) to a planar integration approach where both NFC antenna and charging coil coexist on the same layer. This dimensional reorganization reduces thickness in the vertical dimension while maintaining functional separation through spatial arrangement on the same plane.
2Ease of manufacture
If traditional multi-layer PCB design is used, then component separation is achieved, but distance between charging coils increases reducing efficiency
Solution Approach 1:
The patent merges the NFC antenna pattern and charging coil pattern fabrication processes on the same PCB layer. Both patterns are created using the same copper deposition and etching processes, achieving component separation through pattern design while maintaining manufacturing simplicity and minimizing coil distance for optimal charging efficiency.
3Area of stationary object
If charging coil area is increased to improve alignment tolerance, then chargeable area increases, but electromagnetic interference and heat generation increase
Solution Approach 1:
The patent segments the charging system into multiple independent charging zones by incorporating multiple charging coil patterns on the same layer. Each coil can be independently controlled, allowing the system to activate only the necessary portions, thereby reducing overall electromagnetic interference and heat generation while maintaining a large total chargeable area through spatial distribution.
Solution Approach 2:
The patent applies different characteristics to different regions of the PCB by positioning NFC antenna patterns in peripheral regions and charging coil patterns in central regions. This local quality approach allows optimal performance in each zone while minimizing interference between functions, enabling large chargeable area without proportionally increasing harmful effects.
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 increases the chargeable area and improves charging efficiency by minimizing coil distance and electromagnetic interference, ensuring effective heat dissipation and safety during high-wattage charging.
Implementation Method 1
Wireless charging refers to a process in which a device that is charged based on an electromagnetic wave induction principle. The principle is similar to that of a transformer. There is a coil at a transmit terminal and a coil at a receive terminal. The coil at the transmit terminal is connected to a wired power supply and generates an electromagnetic signal. The coil at the receive terminal induces the electromagnetic signal from the transmit terminal and converts the electromagnetic signal into a required direct current
Implementation Method 2
an electric field shielding mechanism implemented on a first layer among the plurality of layers
Data Source
AI summary
The present disclosure provides a multi-function charging printed circuit board by forming a short-range antenna and multiple charging coils on multiple layers, wherein the short-range antenna and at least one charging coil is integrated on a single layer. One or more temperature-detecting units are disposed on the charging side of the charging printed circuit board for effectively dissipating heat and avoiding over-temperature accidents. A ferrite sheet is attached to the bottom side of the wireless charging printed circuit board for improving the efficiency of wireless charging.