Transformer-Coupled Serial Interface for Ground-Isolated Line Code Conversion
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Solution Overview
Problem
Existing serial communication interfaces face challenges in interoperability between modern and legacy devices due to ground potential differences, leading to communication issues and the need for costly and labor-intensive replacements.
Innovation Solution
A bi-directional full-duplex transformer-coupled interface that decodes and encodes signals between devices operating at different line codes, using components like transformers, equalizers, clock data recovery units, and framing logic to facilitate communication between legacy and modern devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a common communication protocol is used for all devices on a serial interface, then interoperability is achieved, but legacy devices cannot communicate with modern devices due to ground potential differences and different line codes
Solution Approach 1:
The patent introduces a legacy interface adapter as an intermediary device between legacy and modern devices. The adapter includes a legacy interface circuit that communicates with legacy devices using their native line code and ground reference, and a modern interface circuit that communicates with modern devices using current line code and differential signaling. This intermediary translates signals and adapts protocol differences, enabling interoperability while isolating ground potential differences.
Solution Approach 2:
The patent segments the communication interface into separate legacy and modern interface circuits within the adapter. The legacy interface circuit handles legacy device communication with its specific line code and ground reference, while the modern interface circuit handles modern device communication with differential signaling. This segmentation allows each circuit to be optimized for its specific protocol while working together through the adapter.
2Reliability
If legacy devices are replaced with modern devices, then communication reliability improves, but costs and labor increase significantly
Solution Approach 1:
The legacy interface adapter serves as a mediator that allows modern devices to communicate with legacy devices without requiring replacement of the legacy devices themselves. The adapter handles protocol conversion and ground potential differences, enabling the system to maintain legacy devices while achieving reliable communication through the adapter's translation capabilities.
Solution Approach 2:
The patent changes the interface parameters at the adapter level rather than requiring changes to the legacy devices. The adapter transforms signal characteristics, line codes, and ground references to be compatible between legacy and modern devices, allowing the system to maintain legacy hardware while achieving modern communication reliability through parameter transformation.
3Adaptability or versatility
If transformer coupling is used to isolate ground potential differences, then communication between devices with different ground references becomes possible, but signal degradation occurs requiring equalization
Solution Approach 1:
The transformer in the legacy interface circuit acts as an intermediary that provides galvanic isolation between devices with different ground potentials. The transformer couples the signals magnetically, blocking direct DC ground path differences while allowing AC signal transmission. This enables communication across ground potential differences while the equalizer compensates for signal degradation.
Solution Approach 2:
The equalizer in the legacy interface circuit adjusts signal parameters to compensate for transformation losses and frequency-dependent attenuation. By applying equalization, the system restores signal integrity after transformer coupling, enabling reliable communication despite the signal degradation that occurs through the transformer isolation barrier.
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
Enables seamless communication between devices with different line codes, reducing the need for device replacements, minimizing labor and costs, and isolating communication signals from ground interference and electrostatic discharge.
Implementation Method 1
The communication interface may include a receive transformer in the receive path and a transmit transformer in the transmit path
Data Source
AI summary
A bi-directional full-duplex interface or serial communication interface operable to connected to a first device and a second device to decode or encode a signal between the first device and the second device in the first line code or the second line code. The bi-directional full-duplex interface includes a receive path that converts a first data signal output from the first device at a first communication rate to a second line code for the second device where the first communicate rate is slower than the second line code. The bi-directional full-duplex interface also includes a transmit path that converts a second data signal output from the second device at the second communication rate to the first line code for the first device.