Relay Contact Voltage Monitoring for Power Supply Fault Detection
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Solution Overview
Problem
Existing technologies do not effectively detect abnormalities in relay contacts, which can lead to unstable current flow due to deformation or wear, affecting power supply reliability.
Innovation Solution
A power supply control device and method that acquires a first voltage value at the downstream end of a relay contact and determines abnormalities based on this value, using integrated difference values and count thresholds to detect and notify when an abnormality occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay contact is used for power supply control, then power supply switching is achieved, but abnormality detection capability is insufficient
Solution Approach 1:
The patent implements feedback by continuously monitoring the voltage at the downstream end of the relay contact and comparing it with a reference voltage. The processing unit calculates the difference between these voltages and determines abnormalities based on whether the difference exceeds a threshold, creating a closed-loop detection system that provides continuous feedback on relay contact status.
Solution Approach 2:
The patent introduces an intermediary measurement approach by using voltage as an intermediate parameter to indirectly detect relay contact abnormalities. Instead of directly monitoring the relay contact state, the system measures the voltage at the downstream end, which serves as an intermediary indicator of contact health, allowing abnormality detection without direct contact inspection.
2Reliability
If conductor or terminal deformation occurs, then current flow becomes unstable, but abnormality remains undetected
Solution Approach 1:
The system continuously monitors voltage and provides feedback on current flow stability. By comparing the downstream voltage with the reference voltage and calculating their difference, the system detects deviations that indicate conductor or terminal deformation, converting physical deformation into detectable electrical signal changes.
Solution Approach 2:
The patent utilizes parameter changes in voltage as an indicator of physical changes in the conductor or terminal. When deformation occurs, it alters the electrical characteristics (voltage) at the downstream end, and the system detects these parameter changes to infer the physical state of the components, transforming mechanical deformation into measurable electrical parameter variations.
Data Source
AI summary
A power supply control device controls power supply through a relay contact. A control unit (processing unit) in a microcomputer acquires a first voltage value of an NO terminal of the relay contact on a downstream side, if the relay contact is on. The control unit determines whether or not an abnormality occurs in the relay contact, based on the acquired first voltage value.