Shielded Wire Grounding for High-Voltage Noise Suppression
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Solution Overview
Problem
High-voltage and low-voltage communication systems experience noise interference due to significant potential variation differences, leading to compromised communication performance, especially when high-voltage wiring is connected to a high-voltage system and low-voltage wiring is connected to a low-voltage system, causing noise to be superimposed on high-voltage communication.
Innovation Solution
A shielded wire configuration where the first shielding layer is grounded to the high-voltage system, reducing potential variation differences and suppressing noise, and optionally a second shielding layer grounded to the low-voltage system to secure communication performance for both high-voltage and low-voltage systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shielding layer of high-voltage wiring is grounded to the ground potential (low-voltage system), then low-voltage communication performance is secured, but noise is superposed on high-voltage communication due to large potential variation differences
Solution Approach 1:
The patent divides the shielding layer into two separate shielding layers: a first shielding layer grounded to the high-voltage system and a second shielding layer grounded to the low-voltage system. This segmentation allows each shielding layer to independently handle noise for its respective voltage system, resolving the contradiction between securing low-voltage communication and preventing noise on high-voltage communication.
Solution Approach 2:
The patent applies different grounding potentials to different parts of the shielding structure. The first shielding layer is grounded to the high-voltage system potential, while the second shielding layer is grounded to the low-voltage system ground potential. This local differentiation of grounding quality allows each layer to optimize for its specific voltage environment, eliminating noise superposition while maintaining communication performance.
2Stability of the object's composition
If the shielding layer is grounded to the ground potential, then low-voltage communication is stable, but potential variation difference generates noise on high-voltage wiring
Solution Approach 1:
The patent segments the single shielding layer into two distinct shielding layers with different grounding references. The first shielding layer maintains stability for high-voltage communication by grounding to the high-voltage system, while the second shielding layer maintains stability for low-voltage communication by grounding to the ground potential. This eliminates the harmful potential variation difference that would otherwise affect high-voltage wiring.
Solution Approach 2:
The first shielding layer acts as an intermediary between the high-voltage wire and the high-voltage system ground, while the second shielding layer acts as an intermediary between the first shielding layer and the low-voltage system ground. These intermediary layers provide isolated reference potentials for each voltage system, preventing direct coupling of potential variations that would generate noise.
3Device complexity
If a single shielding layer is used with ground connection, then structure is simple, but communication performance of both high-voltage and low-voltage systems cannot be simultaneously secured
Solution Approach 1:
The patent divides the shielding function into two separate shielding layers, each optimized for a specific voltage system. While this increases structural complexity compared to a single shielding layer, it simultaneously enables both high-voltage and low-voltage communication systems to achieve reliable performance by providing appropriate grounding references for each.
Solution Approach 2:
The patent employs a nested structure where the first shielding layer is positioned inside the second shielding layer. The wire section is surrounded by the first shielding layer, which is in turn surrounded by the second shielding layer. This nested configuration provides dual protection while maintaining a compact structure, balancing complexity with performance requirements.
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
This configuration effectively suppresses noise interference, ensuring stable communication performance for high-voltage and low-voltage systems by minimizing potential variation differences and preventing noise superposition on high-voltage wiring.
Implementation Method 1
The first shielding layer is grounded to the high-voltage system or a portion with the same potential as the high-voltage system
Implementation Method 2
due to coupling of stray capacitances, filters, or the like, the potential variation difference between a communication reference wire of the high-voltage wiring and the low-voltage wiring (or the ground potential) is possibly superposed as noise
Implementation Method 3
The second shielding layer is grounded to a low-voltage system or a portion with the same potential as the low-voltage system
Data Source
AI summary
A shielded wire is connected to a high-voltage system and conducting high-voltage communication. The shielded wire includes a wire section and a first shielding layer. The first shielding layer covers the wire section. The first shielding layer is grounded to the high-voltage system or an object with the same potential as the high-voltage system.