Wireless Power Transmitter Metal Layer Shielding
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Solution Overview
Problem
Conventional contact charging methods for portable electronic devices are prone to contamination, short circuits, and energy dissipation due to external contact terminals, and existing wireless power transmission systems face challenges in signal reception sensitivity and magnetic field shielding.
Innovation Solution
A wireless power transmitting device with a configuration that includes overlapping coils, a metal layer attached to the circuit board to reduce magnetic flux leakage, and a magnetic sheet with a sintering layer to enhance magnetic permeability, which improves signal reception sensitivity and shielding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal layer is added to shield magnetic flux leakage, then magnetic field shielding is improved, but device complexity increases
Solution Approach 1:
The metal layer is integrated within the existing circuit board structure, nested between the coil assembly and the circuit board surface. This nesting approach allows the shielding function to be incorporated without adding external components, thereby improving magnetic field shielding while minimizing increases in device complexity
Solution Approach 2:
The patent employs a composite structure combining the metal layer with the circuit board and coil assembly. This composite material approach creates an integrated shielding solution that addresses magnetic flux leakage through the synergistic combination of different materials (metal, insulating material, circuit board) rather than adding a separate shielding component
2Productivity
If overlapping coils are used to improve power transmission, then wireless power transmission efficiency is improved, but magnetic field interference increases
Solution Approach 1:
The patent converts the potentially harmful magnetic field interference generated by overlapping coils into a beneficial effect by introducing a metal layer that redirects and contains the magnetic flux. The overlapping coil configuration that would normally create interference is instead harnessed to generate enhanced magnetic coupling, while the metal layer captures and directs the magnetic flux to improve overall transmission efficiency
Solution Approach 2:
The metal layer acts as an intermediary between the overlapping coils and the external environment, mediating the magnetic field interactions. It serves as a flux guide that channels the magnetic fields generated by the overlapping coils in a controlled manner, converting what would be interfering fields into constructive magnetic coupling that enhances power transmission efficiency
3Ease of operation
If contact terminals are used for charging, then charging connection is simple, but contact contamination and short circuits occur
Solution Approach 1:
The patent replaces the mechanical contact-based charging system with a wireless electromagnetic induction system. Instead of relying on physical contact terminals that are prone to contamination and short circuits, the invention uses electromagnetic fields to transfer power wirelessly, thereby maintaining ease of operation (simple placement) while dramatically improving reliability by eliminating contact-related failures
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 solution effectively enhances signal reception sensitivity and reduces noise levels in the wireless power receiving device, improving the shielding of magnetic fields and minimizing the impact of parasitic capacitors, resulting in improved charging efficiency and reduced heat generation.
Implementation Method 1
a coil configured to generate a wireless power signal
Implementation Method 2
a magnetic sheet with a sintering layer to enhance magnetic permeability
Implementation Method 3
a metal layer attached to the circuit board to reduce magnetic flux leakage
Data Source
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AI summary
Provided is a wireless power transmitting device (100) for a wireless power communication system. The wireless power transmitting device includes: a circuit board (170) including an insulating layer (173) and a ground (171) formed on the insulating layer; a core (150) of a magnetic substance disposed on the circuit board to have a concave portion; a wire-wound coil (111) accommodated in the concave portion to have one end for receiving a power through the circuit board and the other end connected to the ground; and a metal laver (192) disposed between the core and the insulating layer to be connected to the ground.