Power Cord Leakage Circuit for Shield Crack Detection
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Solution Overview
Problem
Existing power cords lack effective protection against wire core exposure due to sheath breakage, leading to potential short-circuits and fire hazards.
Innovation Solution
A power cord leakage detection and protection circuit with shielded wires, a shielded wire detection circuit, and a control circuit that activates a tripping coil to disconnect the power when a crack is detected, combined with an indicator lamp for operational state and overvoltage protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no detection mechanism is added to monitor shielded wire integrity, then the device complexity is reduced, but the ability to detect and respond to shielded wire cracks is lost
Solution Approach 1:
The patent uses an intermediary approach by introducing detection wires that are connected to the shielding layer but electrically isolated from the main power conductors. These detection wires act as mediators that sense the integrity of the shielding layer without interfering with the power transmission function, allowing crack detection while maintaining the basic power cord structure.
Solution Approach 2:
The patent replaces what would otherwise require a complex mechanical inspection system with an electrical detection system. Instead of mechanically checking for cracks or breaks in the shielding layer, the detection circuit uses electrical continuity measurements to sense shielding layer integrity, simplifying the overall system while enabling effective monitoring.
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
Prevents fire hazards by automatically disconnecting power when shielded wires crack, ensuring safety and protection against short-circuits.
Implementation Method 1
a tripping coil, wherein a controlled switch controlled by the tripping coil is respectively provided on the live wire and the neutral wire
Implementation Method 2
a pin 2 of the rectifier bridge DB1 is respectively connected to one end of a capacitor C2, one end of the resistor R9 and a pin 1 of a photoelectric coupler U1; a pin 4 of the rectifier bridge DB1 is respectively connected to the other end of the capacitor C2, the other end of the resistor R9 and a pin 2 of the photoelectric coupler U1
Data Source
AI summary
The invention discloses a power cord leakage detection and protection circuit, comprising a live wire, a neutral wire and a tripping coil, wherein a controlled switch controlled by the tripping coil is respectively provided on the live wire and the neutral wire; a shielded wire is respectively provided outside the live wire and the neutral wire; tail ends of the two shielded wires are connected; a shielded wire detection circuit respectively connected to head ends of the two shielded wires is provided between the live wire and the neutral wire for detecting whether the shielded wire is cracked; and the shielded wire detection circuit is connected with a control circuit for controlling the tripping coil to disconnect the controlled switch when the shielded wire is detected to be cracked, preventing the wire core from being exposed after the shielded wire is broken and the short-circuiting between the live wire and the neutral wire to cause a fire accident.