Isolation Barrier Transmission Circuit With Feedback Signal Matching
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Solution Overview
Problem
Existing digital signal transmission systems with isolation barriers face challenges in maintaining logical signal level matching between the primary and secondary sides, especially when external noise affects the common voltage, leading to potential abnormal operations and reliability issues in critical systems.
Innovation Solution
A transmission circuit is designed with an isolation barrier, a primary transmitter, a secondary receiver, a secondary transmitter, and a primary receiver. The primary transmitter repeatedly drives the primary-side input of the isolation barrier until the logical value of the input signal matches the logical value of the return signal, ensuring correct signal transmission through a return channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional signal transmission methods are used without a return channel verification mechanism, then the circuit complexity is reduced, but logical signal level matching cannot be ensured under noise interference
Solution Approach 1:
The patent implements a feedback mechanism where the secondary side transmits return signals back to the primary side through the isolation barrier. The primary transmitter compares the return signal with the original input signal to verify logical level matching. This feedback loop ensures reliability by detecting and correcting transmission errors caused by noise interference, while maintaining relatively simple circuit architecture.
2Reliability
If the primary transmitter repeatedly drives the isolation barrier to ensure signal matching, then signal transmission reliability is improved, but power consumption increases
Solution Approach 1:
The primary transmitter employs periodic driving actions only when signal matching is detected as failed. The system monitors return signals and triggers retransmission cycles selectively based on mismatch detection, rather than continuously driving the isolation barrier. This periodic action ensures reliable signal transmission while minimizing unnecessary power consumption during normal operating conditions.
3Measurement precision
If noise removal filters are applied to improve signal quality, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent replaces complex mechanical/filter-based noise removal systems with an electrical field coupling approach through the isolation barrier. The system uses electrical signal comparison and logical level verification to achieve noise immunity, substituting physical filtering mechanisms with electronic verification methods that are simpler and more efficient.
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 ensures reliable digital signal transmission by maintaining logical signal level matching with minimal retransmissions, reducing power consumption, and minimizing the occurrence of abnormal operations due to noise interference.
Implementation Method 1
an isolation barrier; a primary transmitter structured to drive a primary-side input of the isolation barrier
Data Source
AI summary
A primary transmitter drives a primary-side input of an isolation barrier in response to a transition of an input signal. A secondary receiver generates an output signal having a logical value that corresponds to a signal that occurs at a secondary-side output of the isolation barrier. A secondary transmitter drives a secondary-side input of the isolation barrier based on the output signal. A primary receiver generates a return signal having a logical value that corresponds to a signal that occurs at a primary-side output of the isolation barrier. The primary transmitter repeatedly drives the primary-side input of the isolation barrier until the logical value of the input signal matches that of the return signal.