Isolation Modulation Circuit for Bidirectional Data Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems face challenges in performing bidirectional data transmission over isolation mediums due to the complications caused by galvanic isolation, which can hinder the efficient processing of data signals and pose safety hazards.
Innovation Solution
A system utilizing programmable delay circuits and modulation techniques to shift differential signals to higher frequency bands, allowing transmission through isolation devices with reduced attenuation, while maintaining compatibility with various protocols and transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If galvanic isolation is implemented to prevent DC signal flow and ensure safety, then safety and circuit protection are improved, but bidirectional data transmission capability deteriorates
Solution Approach 1:
The patent applies parameter changes by modulating signals at specific frequencies (e.g., 1 kHz, 10 kHz, 100 kHz) to enable data transmission through the isolation barrier. The system transforms baseband signals into higher frequency modulated signals that can pass through the isolation medium, and uses programmable delay circuits to compensate for transmission delays, thereby achieving bidirectional communication while maintaining galvanic isolation for safety.
2Reliability
If isolation medium is introduced to provide galvanic isolation, then circuit protection is improved, but signal transmission efficiency deteriorates
Solution Approach 1:
The patent uses an intermediary approach by introducing a modulation circuit and demodulation circuit as mediators between the isolated devices. The modulation circuit converts signals to a frequency suitable for transmission through the isolation medium, and the demodulation circuit recovers the original signal on the other side. This intermediary processing enables efficient signal transmission while maintaining the protective isolation barrier.
Solution Approach 2:
The system changes signal parameters by modulating the frequency of transmitted signals to match the passband characteristics of the isolation medium. Programmable delay circuits adjust timing parameters to compensate for transmission delays, ensuring efficient and accurate signal recovery on the receiving end.
3Adaptability or versatility
If modulation signals are used to enable transmission through isolation medium, then bidirectional communication is improved, but system complexity increases
Solution Approach 1:
The patent implements universality by designing a single isolation medium that can support multiple communication protocols and signal types through frequency modulation. The same modulation circuitry can handle different data rates and communication modes by adjusting modulation parameters, eliminating the need for multiple specialized isolation devices for different communication requirements.
Solution Approach 2:
The system employs dynamic adjustments through programmable delay circuits and configurable modulation parameters. The delay circuits can be programmed to compensate for varying transmission distances and conditions, while the modulation parameters can be dynamically adjusted to optimize performance for different communication scenarios, reducing the need for complex hardware redesign.
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 efficient bidirectional data transmission over isolation mediums by reducing transformer size and cost, while ensuring safety and compatibility with diverse signaling protocols and modes.
Implementation Method 1
A modulation circuit is coupled to the first terminal and configured to modulate an input signal with a carrier signal to produce a modulated signal
Implementation Method 2
it may be desirable to interpose an isolation device between the two devices to provide galvanic isolation. Galvanic isolation can prevent a flow of direct current (DC) signal or low frequency signal between the two devices
Implementation Method 3
A delay circuit is coupled to the modulation circuit and configured to delay the modulated signal
Data Source
AI summary
An apparatus includes a controller and a circuit. The controller has control outputs and including a programmable delay circuit. The circuit is coupled between first terminals and second terminals, the modulator circuit having control inputs coupled to the control outputs, the circuit configurable to: receive modulation signals at the control inputs; modulate first signals at the first terminals with the modulation signals; provide the modulated first signals at the second terminals. modulate second signals at the second terminals with the modulation signals; and provide the modulated second signals at the first terminals.