Offset Signal Monitoring in Noise Reduction Circuits for EMI Fault Diagnosis
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Solution Overview
Problem
Existing noise reduction devices do not operate properly in some cases, leading to potential defects due to noise components generated in the load of a predetermined circuit, which can cause malfunctions in other devices via ground potential.
Innovation Solution
A noise reduction device is designed with a noise reduction circuit that generates an offset signal with reverse polarity of a noise component and a failure diagnosis circuit that detects the level of the offset signal, determining if it deviates from an appropriate range to diagnose potential failures in the noise reduction circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a noise reduction circuit generates an offset signal to cancel noise components, then noise reduction effectiveness is improved, but the risk of circuit failure and undetected malfunctions increases
Solution Approach 1:
The patent implements a feedback mechanism where the failure diagnosis circuit continuously monitors the offset signal generated by the noise reduction circuit. The diagnosis result is fed back to determine whether to continue or stop the noise reduction operation, creating a closed-loop system that adapts to circuit health status and prevents failure propagation.
Solution Approach 2:
The noise reduction device performs self-diagnosis through the failure diagnosis circuit that automatically monitors its own offset signal without requiring external intervention. The system autonomously detects abnormalities and makes decisions about continuing or stopping operation, enabling self-service failure detection and protection.
2Object-affected harmful factors
If the noise reduction device operates continuously to suppress noise, then noise reduction performance is maintained, but undetected failures may cause defects in other devices
Solution Approach 1:
The failure diagnosis circuit performs preliminary detection of offset signal abnormalities before they can cause harmful effects. By detecting issues in advance and stopping the noise reduction operation proactively, the system prevents potential defect propagation to other devices through ground potential, rather than waiting for actual failures to occur.
3Reliability
If the failure diagnosis circuit monitors the offset signal level, then circuit reliability is improved, but device complexity increases
Solution Approach 1:
The failure diagnosis circuit serves multiple functions: it monitors the offset signal level, determines whether the signal is within appropriate ranges, diagnoses potential failures, and controls the operation state of the noise reduction circuit. This multi-functional approach consolidates several potential separate circuits into one, reducing overall device complexity while maintaining high reliability.
Data Source
AI summary
A noise reduction device according to one embodiment includes a noise reduction circuit and a failure diagnosis circuit. The noise reduction circuit generates an offset signal with reverse polarity of a noise component generated in a load. The failure diagnosis circuit detects a level of the offset signal. The failure diagnosis circuit determines whether or not a detected level of the offset signal deviates from an appropriate range. The failure diagnosis circuit diagnoses, on the basis of a determination result, whether or not a failure has occurred in the noise reduction circuit.