Relay Unit Noise-Resistant Contact Testing
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Solution Overview
Problem
Existing relay units face challenges in accurately detecting abnormalities in normally closed contacts due to noise interference during monitoring, leading to incorrect detection of ON defects.
Innovation Solution
A relay unit design that includes a switching circuit with multiple contact configurations and a controller, which sends distinct test signals to normally closed contacts and assesses their states using different predetermined criteria to differentiate between normal and abnormal conditions, even in the presence of noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single test signal is used to monitor normally closed contacts, then the monitoring process is simple, but noise interference causes incorrect detection of contact abnormalities
Solution Approach 1:
The patent divides the monitoring process into multiple independent test signal channels, each with distinct characteristics (frequency, amplitude, or waveform). Instead of using a single test signal for all normally closed contacts, the system segments the monitoring into separate test sequences, allowing individual analysis of each contact's response while filtering out noise through pattern recognition across multiple channels.
2Reliability
If multiple test signals with different criteria are used to improve detection accuracy, then contact state assessment reliability improves, but the system complexity increases
Solution Approach 1:
The patent changes the parameters of test signals (frequency, amplitude, pulse width, or waveform shape) and corresponding evaluation criteria to differentiate between normal and abnormal contact states. By varying these parameters across multiple test sequences, the system creates unique response patterns for different contact conditions, enabling reliable detection while managing complexity through systematic parameter variation rather than arbitrary complexity.
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 design enhances the reliability of testing normally closed contacts by accurately identifying abnormalities and noise interference, ensuring correct assessment of contact states.
Implementation Method 1
a relay coil, wherein the relay coil is configured to generate a magnetic field in order to change the state of the first and second mechanical switch and their respective contacts
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The reliability of testing a normally closed contact in a relay unit may involve the following. Sending a first test signal to the first normally closed contact and detecting a return state of the first test signal sent, sending a second test signal different from the first test signal to the second normally closed contact and detecting a return state of the second test signal sent; and assessing an abnormality when at least one of the detection result for the return state of the first test signal does not satisfy a first predetermined criteria, and the detection result of the return state of the second test signal does not satisfy a second predetermined criteria different from the first predetermined criteria.