Leakage Current Detection Device Self-Testing Circuit
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Solution Overview
Problem
Leakage current protection devices in electrical appliances can malfunction due to environmental factors or installation issues, posing safety risks to users, as they may not function properly even after initial testing.
Innovation Solution
A leakage current detection device with a self-testing function, incorporating a switching module, leakage current detection module, and self-testing modules that generate simulated pulse signals to periodically test the device's functionality, providing user alerts for malfunction detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leakage current protection device is provided with only basic detection function, then the device structure remains simple, but the device may malfunction during use without user awareness
Solution Approach 1:
The patent implements a self-testing function that periodically generates simulated leakage current signals to test the detection module before actual use. This preliminary action ensures the device is functioning properly, preventing undetected malfunctions that would otherwise compromise reliability without significantly increasing device complexity.
Solution Approach 2:
The device performs self-diagnosis by automatically generating test signals and monitoring its own detection capabilities. The leakage current detection module tests itself by responding to simulated leakage signals, eliminating the need for external testing equipment or user intervention, thereby improving reliability while maintaining simple operation.
2Reliability
If a self-testing function is added to the leakage current protection device, then the device reliability is improved, but the device complexity increases
Solution Approach 1:
The self-testing function is merged with the existing leakage current detection module. The same detection module that monitors actual leakage currents also detects simulated test signals. This integration avoids adding separate testing hardware, improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The leakage current detection module serves dual purposes: it detects both actual leakage currents during normal operation and simulated test signals during self-testing. This multi-functionality allows the device to perform self-diagnostics without requiring dedicated testing components, thereby improving reliability with minimal complexity increase.
3Reliability
If the device operates continuously without self-testing, then the operation is smooth and uninterrupted, but undetected malfunctions may pose safety risks
Solution Approach 1:
The device performs self-testing at periodic intervals rather than continuously. The control module activates the simulated leakage current source at predetermined time intervals, allowing the device to operate smoothly between tests while still ensuring safety through regular self-diagnosis. This periodic approach balances safety assurance with minimal interruption to normal operation.
Data Source
AI summary
A leakage current detection device includes a switching module coupled between power input and output terminals, for controlling the electrical connection between the input and output terminals; a leakage current detection module, including a switch driving component, configured to control the switching module based on working periods of the switch driving component and based on whether a leakage current signal is detected; and a first self testing module, coupled to the leakage current detection module, for periodically generating a self testing pulse signal as a simulated leakage current signal. The first self testing module includes: a periodic timing circuit and a self testing pulse signal generating circuit coupled to each other, where the periodic timing circuit controls the period of the self testing pulse signal. The device provides enhanced safety protection.