Signal Transmission Across Isolation Barrier Using Modulation
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Solution Overview
Problem
Conventional isolation barriers in electronic circuitry face challenges in effectively transmitting information signals while maintaining electrical isolation, particularly in ensuring reliable signal integrity and feedback loops across isolation boundaries.
Innovation Solution
A method involving signal preconditioning using modulation functions, transmission through an isolation barrier, and subsequent demodulation to recover feedback signals, employing components like capacitors, analog-to-digital converters, and digital-to-analog converters to enable bidirectional communication across isolation barriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transformer is used to provide isolation, then electrical isolation and surge protection are achieved, but the device complexity and size increase
Solution Approach 1:
The patent replaces the mechanical transformer-based isolation system with an electronic modulation/demodulation system. The isolator uses a modulator to convert the input signal to a modulated signal that can be transmitted through the isolation barrier, and a demodulator to recover the original signal on the output side. This substitution eliminates the need for bulky transformers while maintaining electrical isolation and improving response speed.
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 approach ensures reliable and efficient transmission of information signals across isolation barriers, maintaining electrical isolation while allowing for feedback loops, thereby enhancing the control and regulation of electronic systems.
Implementation Method 1
an isolator circuit that uses capacitors to couple a feedback signal across an isolation barrier
Data Source
AI summary
A method for transmitting an information signal across an isolation barrier comprises receiving an input signal, preconditioning the input signal according to a modulation function, passing the preconditioned signal through the isolation barrier, and recovering the passed signal according to a demodulation function corresponding to the modulation function, the recovered signal being operative as a feedback signal.