Power Plug Leakage Protection via Tripping Device and Movable Springs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current power plugs lack a leakage protection structure, leading to potential short-circuiting failures between live, neutral, and ground wires, causing damage to household appliances, and their complex designs are not suitable for mass production.
Innovation Solution
A power plug with a simple structure and leakage protection function, featuring a casing with reset and test buttons, movable springs, a tripping device, and a leakage protection circuit comprising a trip coil, zero-sequence transformers, a control chip, and a silicon controlled rectifier, which detects leakage failures and disconnects the power supply when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leakage protection structure is added to the power plug, then the protective performance is improved, but the internal structure becomes more complicated
Solution Approach 1:
The patent combines the leakage protection function with the existing power plug structure by integrating the tripping device, movable springs, and contact points directly into the plug's internal architecture. The tripping device is positioned to work with the existing casing and pin structure, merging protective functions with the original design rather than adding separate independent components.
Solution Approach 2:
The power plug is designed to perform multiple functions: it provides electrical connection through the pins, offers leakage protection via the tripping device, and includes user control through reset and test buttons. The same structural elements serve both connection and protection purposes, making the device multi-functional and reducing overall complexity.
2Reliability
If a leakage protection circuit with multiple components is implemented, then the leakage detection capability is improved, but the ease of manufacture is reduced
Solution Approach 1:
The leakage protection circuit is segmented into distinct functional modules: the zero-sequence transformer for detection, the control chip for processing, the silicon controlled rectifier for switching, and the tripping device for mechanical action. Each module can be manufactured and tested independently, then assembled into the final product, facilitating mass production while maintaining detection capability.
Solution Approach 2:
The patent uses a control chip as an intermediary between the detection circuit (zero-sequence transformer) and the execution device (tripping mechanism). This intermediary processes the detection signal and controls the switching action, simplifying the overall control logic and making the system easier to manufacture and assemble.
3Ease of manufacture
If the power plug structure is simplified for mass production, then the ease of manufacture is improved, but the protective performance may be compromised
Solution Approach 1:
The essential protective function is extracted from complex circuitry and implemented through a streamlined tripping mechanism that directly responds to leakage conditions. The movable springs and contact points provide a simple mechanical means to disconnect power when leakage is detected, maintaining protective performance while simplifying the overall structure for mass production.
Solution Approach 2:
The patent replaces complex electronic protection circuits with a mechanically simple tripping device that uses movable springs and contact points to achieve disconnection. This mechanical approach simplifies manufacturing while maintaining reliable protective function, as the mechanical components are easier to produce at scale than complex electronic assemblies.
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
Effectively protects household appliances by cutting off power supply during leakage failures or phase breaks, while being easily mass-produced due to its simplified design.
Implementation Method 1
a pair of zero-sequence transformers 62, a control chip U1, and a silicon controlled rectifier SCR; the metal ring of the zero-sequence transformer 62 is disposed on the power supply cable of the connection load
Implementation Method 2
the cathode of the silicon controlled rectifier SCR is connected with one end of the trip coil 61
Data Source
AI summary
The present invention discloses a power plug providing leakage protection comprising a casing, reset button and test button provided to the surface of the top of the casing; wherein movable springs respectively connected to power supply live wire and neutral wire pins are fixedly provided to the bottom part of a circuit board, movable contact points have separate electrical connections with free ends of the movable springs, stationary contact points corresponding to the movable contact points are provided to the circuit board and connected to a loading power supply cable; and a tripping device capable of contacting or disconnecting the movable and stationary contact points is provided inside the casing. The present invention is safe; has strong protective performance, simple structure, and reasonable design, and is safe, suited for mass production, and able to detect a power cable leakage failure and promptly sever the loaded connection with the power supply.