Ethernet Link Electrical Isolation for Aircraft Docking
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Solution Overview
Problem
Existing serial links, such as USB, in computer systems lack electrical isolation, leading to risks from electrostatic discharge, particularly in aircraft where composite materials reduce the effectiveness of Faraday cages, and also restrict communication distance and feedback, necessitating bulky components and separate power and communication functions.
Innovation Solution
A connection device using an Ethernet link with electrical isolation via a power supply module and isolating transformers to transmit both data and power, allowing for reliable and robust communication over long distances while ensuring electrical isolation between equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical isolation components (spark gap, lightning diode, varistor) are used to protect against electrostatic discharge, then protection capability is improved, but device size increases and signal attenuation problems occur
Solution Approach 1:
The patent introduces an Ethernet link as an intermediary medium between the master computer unit and peripheral device. This Ethernet link provides inherent electrical isolation through its differential signaling and physical layer design, eliminating the need for bulky non-linear protection components while maintaining protection against electrostatic discharge. The Ethernet interface acts as a mediator that transfers data and power without direct electrical connection.
Solution Approach 2:
The patent replaces the mechanical/electrical protection components (spark gaps, varistors, lightning diodes) with an Ethernet-based electrical isolation system. By substituting the traditional direct electrical connection with Ethernet's differential signaling and isolation architecture, the system achieves protection without the physical bulk and signal degradation issues of conventional protection devices.
2Weight of moving object
If composite materials are used for aircraft fuselage, then weight is reduced, but electromagnetic shielding capability deteriorates
Solution Approach 1:
The Ethernet link serves as an intermediary that provides electrical isolation between equipment, making the system independent of the aircraft fuselage's electromagnetic shielding properties. By using differential signaling and inherent isolation in the Ethernet interface, the system compensates for the reduced Faraday cage effect of composite materials without adding weight.
3Reliability
If hardware ground is used as reference for electromagnetic compatibility, then electromagnetic compatibility is improved, but coupling capacitance is limited in composite material environments
Solution Approach 1:
The patent replaces the hardware ground reference system with an Ethernet-based differential signaling system. This substitution eliminates dependence on hardware ground and coupling capacitance by using balanced differential pairs that are inherently immune to ground potential differences and electromagnetic interference, providing electromagnetic compatibility without requiring large coupling capacitance values.
4Ease of operation
If serial links (USB, PS2, ARINC 429, CAN bus) are used for connection, then ease of operation is maintained, but communication distance is restricted
Solution Approach 1:
The patent applies Ethernet technology, originally designed for networking, to the peripheral connection domain. Ethernet's multi-functionality and long-distance capabilities are leveraged to provide both data communication and power transmission (through PoE or isolated power modules) over extended distances, while maintaining ease of operation through standard Ethernet interfaces and cables.
5Reliability
If power supply and communication functions are kept separate, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges power supply and communication functions into a single Ethernet-based interface. By using the Ethernet link to carry both data signals and power (through isolated power modules or Power over Ethernet), the system achieves functional integration without compromising reliability, as the Ethernet protocol and physical layer provide inherent isolation and error handling capabilities.
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 Ethernet link provides reliable data transmission and power supply over long distances with electrical isolation, reducing the need for bulky components and separate power and communication functions, enhancing electromagnetic compatibility and simplifying maintenance.
Implementation Method 1
each of which is provided with an external connection port of a first type for connecting to the corresponding piece of equipment, and which are connected to each other via electrical isolation using a link of a second type
Data Source
AI summary
A connection device for connecting a piece of master electronic equipment to a piece of peripheral electronic equipment, each being provided with a respective external connection port of a first type, the device comprising a master connection unit and a peripheral connection unit, each of which is provided with an external connection port of the first type for connecting to the corresponding piece of equipment, and which are connected to each other via electrical isolation using a link of a second type, namely of the Ethernet type, having a transmit line and a receive line, each unit including a first type/Ethernet interface connected to said lines and a power supply module mounted in common mode between the transmit and receive lines in order to transmit or receive AC over the link. A docking station for peripheral equipment including such a device.