Isolated Signal Transfer Circuit With Logic Mismatch Feedback
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Solution Overview
Problem
Conventional signal-transferring devices experience input/output logic mismatches due to noise, leading to unintended inversion of output signal logic levels, and existing solutions do not effectively address the issue of mismatch detection and correction.
Innovation Solution
A signal-transferring device with first and second circuits operating on different ground references, utilizing transformers for signal transfer while providing insulation, and including a mask processing unit to disregard noise pulses and an operational state assessment unit to monitor and correct logic level mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional barrier unit (transformer) is used to transfer signals between primary and secondary sides, then insulation between sides is provided, but input/output logic mismatch occurs due to noise causing unintended inversion of output signal logic levels
Solution Approach 1:
The patent implements feedback by having the second circuit notify the first circuit about the logic level of the output signal, and the first circuit compares this feedback with the current input signal logic level to detect mismatches. When a mismatch is detected, the first circuit sends a correction notification to the second circuit to restore the correct logic level, thereby resolving the contradiction between maintaining insulation and preventing noise-induced errors.
Solution Approach 2:
The patent applies preliminary action by continuously monitoring the output signal logic level through feedback before actual mismatch problems affect system operation. The system proactively detects potential logic inversion issues by comparing feedback with expected values and initiates correction before the mismatch propagates through the system.
2Reliability
If periodic refresh pulses are outputted from the input-side transmission unit to restore original logic level, then logic level restoration is achieved, but the solution is unilateral and does not provide effective mismatch detection
Solution Approach 1:
The patent inverts the conventional approach by having the output side (second circuit) actively notify the input side (first circuit) about the actual output logic level through feedback. Instead of the input side unilaterally sending refresh pulses without knowing the actual output state, the system now bases correction actions on actual feedback information from the output side, making the correction mechanism bidirectional and more effective.
3Productivity
If the first circuit notifies the second circuit about input signal logic level only when switching occurs, then communication efficiency is maintained, but logic level mismatch cannot be detected and corrected
Solution Approach 1:
The patent resolves this contradiction by introducing feedback from the second circuit to the first circuit regarding the output signal logic level. The first circuit uses this feedback to detect mismatches by comparing it with the current input signal state, enabling reliable mismatch detection while maintaining efficient communication by only initiating correction notifications when actual mismatches are detected through feedback comparison.
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 device quickly resolves input/output logic mismatches by detecting and correcting unintended logic level changes, ensuring reliable signal transfer between the primary and secondary sides.
Implementation Method 1
a barrier unit (transformer) transfers the signals A and B to a secondary side while providing insulation between the primary side and the secondary side
Data Source
AI summary
A signal-transferring device having a first circuit and a second circuit that operate on different ground references, and a third circuit for transferring signals while providing insulation between the first circuit and the second circuit. The second circuit switches a logic level of an output signal in accordance with the logic level of an input signal notified by the first circuit, and notifies the first circuit about the logic level of the output signal. The first circuit notifies the second circuit about the logic level of the input signal not only when the logic level of the input signal has been switched, but also when the logic level of the output signal notified by the second circuit does not match the logic level of the input signal.