Intelligent Leakage Current Detection Device for Open Circuit Safety
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Solution Overview
Problem
Current leakage current detection and interruption devices (LCDI) fail to function effectively when the leakage current detection line is open-circuited, leading to potential fire hazards due to undetected leakage currents.
Innovation Solution
An intelligent leakage current detection and interruption device is designed with a power cord configuration that includes a switch module, leakage current detection lines, and a detection monitoring module, which forms a detection current path to detect leakage currents and open circuit conditions, using semiconductor switches and resistors to control power interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the leakage current detection line is used to detect leakage current, then leakage current protection function is achieved, but the device cannot detect open circuit conditions in the detection line itself
Solution Approach 1:
The patent introduces a feedback mechanism where the detection monitoring module continuously monitors the integrity of the leakage current detection line by detecting current flow through the detection line. When an open circuit condition is detected (no current flow), the system generates an alarm signal to indicate the fault condition, enabling the system to detect its own operational status.
Solution Approach 2:
The patent introduces an intermediary detection monitoring module that acts as a mediator between the leakage current detection line and the control system. This module includes a detection resistor connected in series with the leakage current detection line, allowing the system to monitor the electrical state of the detection line without interfering with its primary leakage current detection function.
2Loss of information
If the detection current path includes the leakage current detection line, then open circuit conditions can be detected, but false alarms may occur due to normal current variations
Solution Approach 1:
The patent applies partial action by using a detection monitoring module that only monitors a portion of the electrical characteristics (current flow through the detection line) rather than attempting to analyze all electrical parameters. This selective monitoring approach reduces complexity and minimizes the risk of false alarms while still effectively detecting open circuit conditions.
3Reliability
If additional monitoring components are added to detect open circuit conditions, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the detection monitoring module with the existing leakage current detection system by integrating the detection resistor and monitoring circuitry into the current detection path. This combination allows the system to perform both leakage current detection and open circuit condition monitoring using a unified structural framework, thereby reducing overall system complexity.
Solution Approach 2:
The detection monitoring module is designed to serve multiple functions: it monitors the integrity of the leakage current detection line, detects open circuit conditions, and provides feedback to the control system. This multi-functionality reduces the need for separate dedicated components for each function, thereby simplifying the overall device architecture.
Data Source
AI summary
A power cord for a leakage current detection and interruption device including two insulated power supply lines, two leakage current detection lines for detecting a leakage current on the power supply lines, and two conductor wires. The two leakage current detection lines and the two conductor wires are electrically insulated from each other along the length of the power cord but are electrically connected in series to form a detection current path of a leakage current detection module. The leakage current detection and interruption device further includes a detection monitoring module, coupled in series to the detection current path, for detecting an open circuit condition in the detection current path. The device further includes a switch module and a drive module, which can cut off power supply in response to a detected leakage current or open circuit condition in the detection current path.