PCB Noise Reduction Device Using Wave Absorber and Grounded Blocking Sheet
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Solution Overview
Problem
Portable electronic devices often interfere with each other due to electromagnetic waves, causing issues like screen flickering or shutdown when placed close together, as conventional noise reduction methods are inadequate in blocking these waves effectively.
Innovation Solution
A noise reduction device comprising a wave absorber, a blocking sheet, and an electrically conductive member is integrated into a printed circuit assembly. The wave absorber, made of materials with high magnetic permeability, covers the processor and oscillator, while the blocking sheet and conductive member enhance noise-blocking by connecting to ground, preventing electromagnetic interference and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional insulators are used for noise reduction, then the device structure is simple, but the electromagnetic wave blocking performance is insufficient
Solution Approach 1:
The patent uses a composite structure combining wave absorber (ferrite material), blocking sheet (conductive material), and insulator, which together provide superior electromagnetic wave blocking performance compared to conventional single-material insulators
Solution Approach 2:
The blocking sheet acts as an intermediary between the wave absorber and the oscillator, providing additional shielding while the wave absorber handles the primary electromagnetic wave absorption, creating a multi-layer defense system
2Reliability
If a complex noise reduction structure is implemented, then the electromagnetic wave blocking performance is improved, but the device complexity increases
Solution Approach 1:
The noise reduction device is divided into distinct functional segments: wave absorber for electromagnetic wave absorption, blocking sheet for additional shielding, and insulator for electrical isolation, allowing each component to be optimized independently while maintaining overall simplicity
Solution Approach 2:
The wave absorber serves multiple functions: it absorbs electromagnetic waves, provides mechanical support, and acts as an electrical insulator, reducing the need for additional components and simplifying the overall structure
3Volume of moving object
If the noise reduction device is made compact, then it can be fitted into narrow spaces, but the effectiveness of electromagnetic wave blocking may be reduced
Solution Approach 1:
The blocking sheet is implemented as a thin conductive film that provides effective electromagnetic shielding while occupying minimal space, allowing the device to maintain compact dimensions without sacrificing noise-blocking performance
Solution Approach 2:
The noise reduction components are arranged in a nested configuration where the blocking sheet is positioned within the wave absorber structure, and the insulator is integrated into the assembly, maximizing space utilization in compact form factor
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 suppresses electromagnetic wave interference, allowing the device to be fitted into narrow spaces without mechanical interference, while ensuring the processor and oscillator are protected from electromagnetic waves and short circuits, providing superior noise-blocking performance compared to conventional insulators.
Implementation Method 1
The wave absorber, made of materials with high magnetic permeability, covers the processor and oscillator
Implementation Method 2
One end of the electrically conductive member is connected to the blocking sheet, and another end of the electrically conductive member is configured to be connected to ground
Data Source
AI summary
A printed circuit assembly includes a printed circuit board, a processor, an oscillator and a noise reduction device. The printed circuit board has a ground connecting portion. The processor is disposed on the printed circuit board. The oscillator is disposed on the printed circuit board. The noise reduction device includes a wave absorber, a blocking sheet and an electrically conductive member. The wave absorber includes a processor covering part and an oscillator covering part. The oscillator covering part protrudes from one side of the processor covering part. The processor covering part and the oscillator covering part respectively cover the processor and the oscillator. The blocking sheet is stacked on the oscillator covering part to cover the oscillator. One end of the electrically conductive member is connected to the blocking sheet, and another end of the printed circuit board is connected to the ground connecting portion.