Differential Signal Link Fault Detection via Low-Rate Amplitude Sensing
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Solution Overview
Problem
Existing signal transmission systems using power over data lines (PoDL) struggle to detect failures in filter circuits, particularly short-circuit failures, which can disrupt signal quality and power supply, leading to undetected issues.
Innovation Solution
A signal transmission device and system that includes a communication unit capable of differential transmission and a signal processing unit, which measures the amplitude of communication signals at reduced transmission rates to detect short-circuit failures in filter circuits, allowing for reliable failure detection and subsequent information provision for repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter circuit is used as a PoDL filter to separate signal and power, then signal quality is maintained and common mode noise is suppressed, but failure detection capability is lost
Solution Approach 1:
The system performs preliminary actions by transmitting test signals at reduced transmission rates before normal operation to proactively detect potential filter circuit failures. This allows failure detection without interrupting normal signal transmission, resolving the contradiction between maintaining signal quality and enabling failure detection.
Solution Approach 2:
The patent introduces an intermediary measurement mechanism that uses reduced transmission rate signals as a diagnostic tool. These lower-rate signals act as intermediaries to probe the health of the filter circuit without interfering with the primary high-rate communication signal, enabling failure detection while preserving signal quality.
2Productivity
If communication signals are transmitted at high signal transmission rates, then communication efficiency is improved, but failure detection accuracy is reduced
Solution Approach 1:
The patent segments the signal transmission into two distinct modes: normal high-rate communication for productivity and low-rate test signal transmission for measurement. This segmentation allows both high communication efficiency and accurate amplitude measurement to coexist by separating their operational requirements in time and frequency domains.
Solution Approach 2:
The system implements periodic action by alternately transmitting normal communication signals at high rates and test signals at reduced rates. This periodic switching between operational modes enables continuous monitoring and accurate measurement without permanently sacrificing communication efficiency, as the test transmissions occur at predetermined intervals.
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 the detection of filter circuit failures, ensuring reliable signal transmission and power supply by adjusting signal transmission rates to accurately measure amplitude changes, facilitating prompt repair and maintenance.
Implementation Method 1
a filter circuit electrically connected between the differential wiring and the power supply unit
Data Source
AI summary
A signal transmission device includes a communication unit that performs communication using differential transmission with an electronic device via a differential wiring, and a signal processing unit that performs signal processing related to the communication, in which the communication unit is capable of receiving, via the differential wiring, communication signals transmitted from the electronic device at each of a plurality of signal transmission rates including at least a first signal transmission rate and a second signal transmission rate lower than the first signal transmission rate, the communication unit measures an amplitude of the communication signals received from the electronic device at the second signal transmission rate, and the signal processing unit detects a short-circuit failure of a filter circuit on the basis of the amplitude measured by the communication unit.