Transformer-Based Communication Between Devices With Different Ground References
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Solution Overview
Problem
Communicating between devices without a common electrical ground is challenging due to the need for expensive optoelectronics or high-frequency modulation schemes, which consume power and increase complexity, and there is also a lack of external AC power at network interface devices (NIDs) for residential gateways.
Innovation Solution
A transformer block with input and output ports is used to communicate data signals and a synchronous clock signal between devices with different voltage ground references, employing a modulator and demodulator block with Boolean logic gates to establish a bi-directional communication link with minimal data distortion, and a power supply unit provides isolated DC power using telephone lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive optoelectronics or high frequency modulation schemes are used to communicate between devices without a common electrical ground, then communication reliability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent introduces an intermediary encoding scheme that transforms data signals into a format suitable for galvanically isolated transmission. Instead of using complex optoelectronics or high-frequency modulation, the invention uses an intermediate encoding layer that represents data states (logic 0 and logic 1) through voltage transitions relative to a floating reference, enabling reliable communication without a common ground while maintaining simplicity and low power consumption
2Reliability
If expensive optoelectronics or high frequency modulation schemes are used to communicate between devices without a common electrical ground, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent introduces an intermediary encoding scheme that transforms data signals into a format suitable for galvanically isolated transmission. Instead of using complex optoelectronics or high-frequency modulation, the invention uses an intermediate encoding layer that represents data states (logic 0 and logic 1) through voltage transitions relative to a floating reference, enabling reliable communication without a common ground while maintaining simplicity and low power consumption
3Ease of manufacture
If the residential gateway is located at the NID outside the house, then installation simplicity is improved, but power availability deteriorates due to no external AC power source
Solution Approach 1:
The patent applies the self-service principle by enabling the NID to generate its own power supply. The system uses the existing communication lines (telephone lines) to provide both data communication and power delivery. The NID incorporates a power supply unit that draws power from these lines, eliminating the need for external AC power sources and allowing the gateway to be located at the NID for simplified installation
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 solution enables cost-effective, low-power communication with minimal data distortion across multiple channels of high-speed data between devices without a common electrical ground, simplifying installation and integration by providing power to NIDs and merging installation practices between xPON and xDSL systems.
Implementation Method 1
a transformer block having output and input ports to communicate a plurality of data signals and a synchronous clock signal between a first device with a first voltage ground reference and a second device with a second voltage ground reference
Implementation Method 2
a modulator block having one or more Boolean logic gates that receive each data signal in combination with the synchronous clock signal. One or more output ports of the modulator block send a plurality of modulated data signals corresponding to the plurality of data signals
Data Source
AI summary
Various methods, apparatuses, and systems are described in which devices having no common electrical ground communicate. In at least certain embodiments, an apparatus includes a transformer block to communicate a plurality of data signals and a synchronous clock signal between a first device with a first ground reference and a second device with a second ground reference over a data communication link. The first device sends the plurality of data signals to a modulator block having one or more Boolean logic gates that receive each data signal in combination with the synchronous clock signal. The modulator block sends a plurality of modulated data signals corresponding to the plurality of data signals to the transformer block. The transformer block sends the plurality of modulated data signals and the synchronous clock signal to the second device to provide the data communication link between devices having different ground references.