Shielding Layer and Conductive Elastomer for Common-Mode Noise Suppression
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Solution Overview
Problem
Existing solutions for suppressing common-mode noise in electromagnetic compatibility (EMC) are costly and inefficient, often requiring complex EMI filter structures or sacrificing thermal performance, which can reduce the reliability and lifespan of power devices.
Innovation Solution
An electronic device with a shielding layer and conductive elastomer is interposed between the current outflow terminal of a switching device and the grounding conductor, using thermal conductive insulation layers for efficient noise suppression without compromising reliability or efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a complex EMI filter structure is designed to suppress common-mode noise, then EMI performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the critical noise path (from switching device current outflow terminal to grounding conductor) and shields only this specific path using a simple metal shielding layer, rather than implementing a complex multi-level EMI filter structure that would be required to cover all common-mode current loops
Solution Approach 2:
The patent introduces a simple metal shielding layer as an intermediary element between the switching device and grounding conductor to block the noise path, replacing the need for complex EMI filter structures with a simple passive shielding barrier
2Object-affected harmful factors
If source noise is optimized by reducing switching loss, then common-mode noise is suppressed, but thermal performance of power component deteriorates
Solution Approach 1:
The patent introduces a shielding layer as an intermediary that blocks the noise propagation path without affecting the thermal path, allowing heat to conduct normally from the power device while preventing electromagnetic noise from reaching the grounding conductor
Solution Approach 2:
The patent segments the problem into two independent paths: thermal conduction path (power device to heatsink) and electromagnetic noise path (current outflow terminal to grounding conductor), and treats them separately to avoid trade-offs between thermal performance and noise suppression
3Temperature
If thermal conductive insulation layers are added between switching device and grounding conductor, then thermal performance is improved, but EMI performance may deteriorate
Solution Approach 1:
The patent segments the thermal and electromagnetic paths by positioning the shielding layer on the current outflow terminal surface, allowing thermal conduction insulation layers to be placed in the bulk between device and heatsink while the shielding layer maintains electromagnetic isolation at the critical noise source location
Solution Approach 2:
The shielding layer acts as an electromagnetic intermediary that blocks noise without interfering with thermal conduction, while thermal conductive insulation layers serve as thermal intermediaries that manage heat flow without affecting the electromagnetic shielding effectiveness
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 improves EMI performance without increasing costs or reducing reliability, enabling mass production and efficient noise suppression in frequency conversion control systems.
Implementation Method 1
The conductive elastomer is configured to connect the current outflow terminal and the shielding layer
Implementation Method 2
The shielding layer is interposed between a current outflow terminal of a switching device and a grounding conductor
Implementation Method 3
a first thermal conductive insulation layer and a second thermal conductive insulation layer may be further arranged between the current outflow terminal and the grounding conductor
Data Source
AI summary
An electronic device and a variable frequency control system using the electronic device. The electronic device may comprise: a shielding layer, which is inserted between a current outflow terminal of a switching device and a grounding conductor; and a conductive elastomer, which is used for connecting the current outflow terminal to the shielding layer.