Leakage Current Detection Line Integrity Verification
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Solution Overview
Problem
Conventional leakage current detection and interruption (LCDI) devices for power cords cannot determine if the leakage current detection line between the plug head and the load end is functioning properly, leading to potential hidden safety threats and fire hazards due to open circuits.
Innovation Solution
A power cord with a leakage current detection and interruption device that includes a switch unit and a leakage current protection unit with a first and second leakage current detection line in series, a switch drive module to control the switch unit based on a leakage current signal, and a testing unit with a test switch to verify the integrity of the leakage current detection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the leakage current detection line has an open circuit, then the device cannot detect leakage currents, but the conventional test circuitry cannot identify this condition
Solution Approach 1:
The test circuitry is designed to provide feedback about the integrity status of the leakage current detection line. By testing continuity through the segmented detection line and providing clear indication of open circuit conditions, the system gives users feedback about whether the protective function is intact, eliminating the information loss about detection line status.
2Device complexity
If the LCDI device lacks the ability to test detection line integrity, then the device structure remains simple, but hidden safety threats cannot be detected
Solution Approach 1:
The test circuitry is designed to enable preliminary testing of the leakage current detection line integrity before actual use or periodically during operation. By performing this preliminary action of testing, the system ensures that the protective function is intact before it is needed, preventing hidden safety threats from going undetected.
Data Source
AI summary
A leakage current detection and interruption (LCDI) device for a power cord includes a switch unit configured to control an electrical connection between an input end and an output end, and a leakage current protection unit, which includes a switch drive module and a leakage current detection module. The leakage current detection module includes first and second leakage current detection lines coupled in series. The switch drive module is configured to control the switch unit based on a leakage current signal generated by the leakage current detection module to disconnect the electrical connection. The LCDI device can detect whether the first and second leakage current detection lines are intact, thereby ensuring the reliability of the device.