Leakage Interruption Circuit for Low-Power AC/DC Fault Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional leakage current detection and interruption devices have high power consumption and limited detection capabilities, making it difficult to meet environmental conservation requirements and user needs.
Innovation Solution
A leakage current detection and interruption device incorporating a current limiting element and multiple detection capabilities, including a switch module, leakage detection module, power module, and driving module, with optional self-test functionality, to reduce power consumption and enhance detection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional leakage current detection and interruption devices are used, then leakage current detection function is provided, but power consumption is high
Solution Approach 1:
The patent implements periodic self-test functionality where the leakage detection module and driving module are tested at intervals rather than continuously. The control module activates the self-test module periodically to generate test signals, allowing the system to maintain detection reliability while reducing power consumption compared to continuous operation.
Solution Approach 2:
The patent extracts and separates the self-test function as an independent module that can be activated independently from normal operation. By taking out the self-test functionality and making it optional/periodic rather than continuous, the system reduces overall power consumption while maintaining the essential leakage detection capability when needed.
2Adaptability or versatility
If conventional leakage current detection and interruption devices are used, then leakage current detection is provided, but detection capabilities are limited to single function
Solution Approach 1:
The patent integrates multiple detection functions into a single unified device. The leakage detection module can detect both leakage current and implement self-diagnosis through the self-test module, allowing the same hardware structure to perform multiple detection tasks (leakage detection and functional integrity detection) without requiring separate devices.
Solution Approach 2:
The patent combines the leakage detection function and self-test function into one integrated device structure. The control module coordinates both functions, and the driving module serves both normal operation and self-test activation, merging multiple functions into a single device to improve versatility without proportionally increasing complexity.
3Reliability
If periodic self-test function is added, then fault detection capability is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service through the self-test module that automatically tests the leakage detection module and driving module without requiring external intervention. The system performs self-diagnosis by generating test signals internally and evaluating its own functional status, improving reliability while avoiding the complexity of external test equipment or manual testing procedures.
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
The device achieves ultra-low power consumption (≤0.1 W) while effectively detecting both AC and pulsating DC leakage currents, and provides a self-test function to timely identify faults, meeting environmental conservation requirements.
Implementation Method 1
the driving module including at least one first electromagnetic coil and at least one first switching semiconductor device
Data Source
AI summary
A leakage detection and interruption device includes a switch module to control power connection between input and output terminals of a power line; a leakage detection module to generates a leakage fault signal when the leakage current on the power line exceeds a threshold; a power module, including a first current limiting element, coupled in series between the power line and the leakage detection module, to supply power to the leakage detection module; the driving module includes a electromagnetic coil and a switching semiconductor device, to drive the switching module to disconnect the power connection in response to a leakage fault signal. The first end of the first current limiting element is coupled to the power line, and the second end is coupled to the first end of the switching semiconductor device through at least one first diode and/or second current limiting element.