Diagnostic Circuit Topology for Sensor and Channel State Detection
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Solution Overview
Problem
Current diagnostic systems for industrial sensors face challenges in distinguishing between sensor states and defects in the communication channel, leading to erroneous determinations due to issues like short circuits or breaks in the circuit.
Innovation Solution
A diagnostic system comprising a detection circuit, an input circuit, and a diagnostic circuit that generates voltage signals indicative of sensor and communication channel states, using a digital-to-analog converter to compare signals and identify states through a comparator, allowing for differentiation between sensor and channel defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple sensor-communication channel system is used, then the device complexity is low, but the ability to distinguish between sensor states and communication channel defects is poor
Solution Approach 1:
The diagnostic system segments the monitoring function into multiple independent circuits: a detection circuit that monitors the communication channel, an input circuit that processes sensor signals, and a diagnostic circuit that analyzes the combined signals. This segmentation allows each circuit to specialize in specific diagnostic tasks, improving the ability to distinguish between sensor states and channel defects while keeping individual circuit complexities manageable
Solution Approach 2:
The patent introduces intermediary circuits (detection circuit with impedance elements, input circuit with voltage signal generation) that act as mediators between the sensor and the diagnostic analysis. These intermediary circuits process and condition signals in a way that enables clear differentiation between sensor output states and communication channel conditions, enhancing measurement precision without requiring direct complex interaction between sensor and diagnostic components
2Reliability
If traditional diagnostic systems are used, then the system is simple, but errors occur in determining sensor states due to communication channel defects
Solution Approach 1:
The detection circuit performs preliminary monitoring of the communication channel conditions before the sensor signal is fully processed. By detecting channel states (such as short circuits or breaks) in advance and generating appropriate indicator signals, the system prevents erroneous sensor state determinations caused by channel defects, thereby improving reliability
Solution Approach 2:
The diagnostic system implements feedback mechanisms where the detection circuit continuously monitors the communication channel and provides feedback signals to the diagnostic circuit. This feedback loop enables real-time adjustment and correction of sensor state determinations based on actual channel conditions, significantly improving the accuracy and reliability of the diagnostic system
3Measurement precision
If multiple diagnostic circuits are added to improve detection accuracy, then the measurement precision improves, but the device complexity and cost increase
Solution Approach 1:
The diagnostic circuit is designed with multi-functionality, capable of analyzing multiple types of signals from both the sensor and communication channel through a single integrated circuit. This universal design achieves high measurement precision for various diagnostic scenarios without requiring separate dedicated circuits for each function, thereby controlling manufacturing cost and complexity
Data Source
AI summary
A diagnostic system includes a detection circuit comprising a first impedance, a second impedance, a first input pin, a second input pin, a first output pin and a second output pin. The detection circuit is configured to receive an input signal via the first and the second input pins. The first impedance is configured to electrically couple the first input pin and the first output pin, and the second impedance is configured to electrically couple the first input pin with the second input pin and second output pin. The diagnostic system also includes a communication channel. The diagnostic system further includes an input circuit comprising a third input pin, a fourth input pin and a third output pin. The input circuit is configured to provide, via the third output pin, a voltage signal.