Hot Docking EMI Shield Connection Structure
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Solution Overview
Problem
The challenge is to mitigate electromagnetic interference (EMI) and electrostatic discharge (ESD) issues when hot docking a notebook PC with a docking station, as existing connecting structures fail to maintain equal electric potential between EMI shields, leading to noise introduction and potential malfunctions due to impedance fluctuations and aerial discharge.
Innovation Solution
The proposed solution involves an EMI connecting portion and an ESD contact portion, where the ESD contact portion initially connects to the EMI shield through a high-impedance element during hot docking, then transitions to a low-impedance connection, ensuring stable EMI shielding and preventing noise introduction by managing electrostatic discharge effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If signal earth lines are connected to EMI shields to provide electromagnetic shielding, then electromagnetic interference protection is improved, but electric potential equality between connected devices cannot be maintained leading to noise introduction
Solution Approach 1:
The patent divides the EMI shield connection into two separate functional parts: an EMI connecting portion for electromagnetic shielding and an ESD contact portion for electrostatic discharge and potential equalization. This segmentation allows each part to perform its specific function optimally without interfering with the other, resolving the contradiction between EMI protection and potential stability.
Solution Approach 2:
The patent introduces a high-impedance element as an intermediary in the ESD contact portion. This high-impedance element acts as a mediator that allows electrostatic discharge while preventing noise introduction, enabling the system to maintain both EMI shielding effectiveness and electric potential stability during hot docking operations.
2Stability of the object's composition
If EMI shields are connected through signal earth lines during hot docking, then electromagnetic shielding is maintained, but impedance fluctuations cause aerial discharge and malfunctions
Solution Approach 1:
The patent implements preliminary action by having the ESD contact portion make contact before the EMI connecting portion during hot docking. This preliminary contact establishes a high-impedance path for electrostatic discharge before the low-impedance EMI connection is made, preventing aerial discharge and impedance fluctuations that would otherwise occur.
Solution Approach 2:
The high-impedance element in the ESD contact portion serves as an intermediary that manages the transition during hot docking. It provides a controlled path for electrostatic discharge while isolating the EMI shield from sudden potential changes, thereby preventing aerial discharge and maintaining connection stability.
3Weight of moving object
If thin EMI shields are used to reduce weight, then portability is improved, but resistance to noise decreases making devices more susceptible to interference
Solution Approach 1:
The high-impedance element in the ESD contact portion acts as an intermediary that compensates for the reduced noise resistance of thin EMI shields. By providing a controlled discharge path for electrostatic charges, it prevents noise introduction that would otherwise more easily affect lighter, thinner shields.
Solution Approach 2:
The patent changes the impedance parameter of the connection path by using a high-impedance element in the ESD contact portion. This parameter change allows the system to maintain noise resistance despite using thinner, lighter EMI shields, as the high impedance prevents noise coupling while still allowing electrostatic discharge.
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 reduces impedance fluctuations, prevents noise introduction into signal lines, and ensures stable operation by effectively managing electrostatic discharge, thereby preventing malfunctions during hot docking.
Implementation Method 1
an ESD contact portion that electrically connects to a second EMI shield through a high-impedance element and that electrically connects the EMI connecting portion to the second EMI shield through the high-impedance element as the ESD contact portion initially contacts the EMI connecting portion during hot docking
Data Source
AI summary
For connecting devices, an electromagnetic interference (EMI) connecting portion includes a conductor connected to a first EMI shield. An electrostatic discharge (ESD) contact portion electrically connects to a second EMI shield through a high-impedance element. The ESD contact portion electrically connects the EMI connecting portion to the second EMI shield through the high-impedance element as the ESD contact portion initially contacts the EMI connecting portion during hot docking. The ESD contact portion subsequently moves in response to the initial contact to contact a low-impedance element electrically connected to the second EMI shield and connect the EMI connecting portion to the second EMI shield through the low-impedance element.