Leakage Current Detection Device with Temporal Self-Test Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Leakage current detection devices with both leakage current detection and self-test functions often experience interference between self-test signals and actual leakage current signals, leading to inaccurate detection and safety concerns.
Innovation Solution
A leakage current detection device structure that includes a self-test unit for activating a simulated leakage current signal, a leakage current detection unit for distinguishing between simulated and actual signals, a self-test feedback turnoff unit to deactivate the simulated signal before a predetermined time, and a power line disconnect unit to ensure the power source is disconnected after the simulated signal is deactivated, preventing interference and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leakage current detection device incorporates both leakage current detection function and self-test function, then the device can perform periodic self-testing to ensure reliability, but the self-test signals interfere with actual leakage current signals leading to inaccurate detection
Solution Approach 1:
The self-test function is implemented through periodic action by generating self-test signals only during designated self-test time periods, separating them temporally from actual leakage current detection periods. This temporal separation allows both functions to operate without interference, maintaining both reliability through regular self-testing and measurement precision during detection phases.
Solution Approach 2:
The operational time is segmented into distinct self-test time periods and detection time periods. During self-test time periods, self-test signals are generated while actual leakage current detection is suspended. During detection time periods, actual leakage current is detected while self-test signals are inactive. This segmentation eliminates signal interference while preserving both functions.
2Reliability
If self-test signals are continuously present for reliability testing, then periodic self-test function is achieved, but the simulated leakage current interferes with actual leakage current detection causing false positives or negatives
Solution Approach 1:
Self-test signals are generated periodically at specific time intervals rather than continuously. The control circuit activates self-test signals only during designated self-test time periods, ensuring that when actual leakage current detection occurs, no self-test signals are present to cause interference, thus maintaining both reliability testing and detection accuracy.
Solution Approach 2:
The system performs preliminary self-test actions during designated self-test time periods before returning to normal detection mode. This preliminary action allows the system to verify its own functionality without affecting subsequent actual leakage current detection, as the self-test signals are deactivated before detection begins.
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 solution effectively separates self-test and leakage current detection functions in the time domain, improving the accuracy of actual leakage current detection and ensuring enhanced safety by preventing interference between simulated and actual signals.
Implementation Method 1
a leakage current detection unit for detecting the simulated leakage current signal and an actual leakage current signal
Implementation Method 2
the self-test feedback turnoff unit deactivates the simulated leakage current signal before a predetermined time point
Data Source
AI summary
A leakage current detection device includes a self-test unit for activating a simulated leakage current signal; a leakage current detection unit for detecting the simulated leakage current signal and the actual leakage current signal, where when at least one of them is present, the leakage current detection unit activates a trigger signal, and when both of them are absent, the leakage current detection unit deactivates the trigger signal; a self-test feedback turnoff unit for detecting the trigger signal, where when the trigger signal is detected, the self-test feedback turnoff unit deactivates the simulated leakage current signal before a predetermined time point; and a power line disconnect unit for detecting the trigger signal after the predetermined time point, and when the trigger signal is detected, it disconnects the power between the power source and the load.