GFCI Reset Locking Mechanism for Reverse Connection Protection
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Solution Overview
Problem
Existing ground fault circuit interrupters (GFCIs) lack a reliable reverse connection-proof function, which can lead to unsafe operation and inability to reset if connections are accidentally reversed.
Innovation Solution
A GFCI design that includes a tripping mechanism, a resetting key, a test key, movable contacts, static contacts, a first locking mechanism, and a control circuit board, which ensures that the device cannot be reset if connections are incorrectly reversed and operates normally only when correctly installed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reverse connection-proof function is added to the GFCI, then safety and reliability are improved, but device complexity increases due to additional locking mechanisms and control circuits
Solution Approach 1:
The first locking member is pre-configured to block the resetting key in case of reverse connection before the device can be reset. The locking mechanism is designed in advance to detect connection polarity and prevent resetting until correct connection is made, thereby ensuring safety without requiring complex real-time monitoring systems.
Solution Approach 2:
The first locking member acts as an intermediary between the connection status and the resetting function. It mediates by physically blocking the resetting key when reverse connection is detected, and only allowing resetting when the connection is correct, thus simplifying the control logic while maintaining reliability.
2Reliability
If the resetting key is blocked by the first locking member in reverse connection, then unsafe operation is prevented, but ease of operation deteriorates as users cannot reset the device
Solution Approach 1:
The first locking member applies preliminary anti-action by blocking the resetting key before any unsafe operation can occur in reverse connection scenarios. This prevents users from attempting to reset an incorrectly connected device, eliminating the risk of unsafe operation while clearly indicating to users that connection correction is required first.
Solution Approach 2:
The device provides self-service by automatically detecting connection polarity and controlling the locking state of the resetting key without user intervention. The system itself determines when resetting should be allowed based on connection status, eliminating the need for complex user judgments or external monitoring.
3Ease of operation
If the horizontal sliding member pushes the main frame to make contacts connect, then the resetting function is achieved, but the mechanical complexity increases due to the sliding mechanism and spring system
Solution Approach 1:
The resetting function is extracted and isolated to a dedicated horizontal sliding member mechanism. This separate mechanism handles only the resetting action through simple horizontal movement driven by the resetting key, while the locking function remains with the rotating piece and first locking member, thereby simplifying the overall system architecture.
Solution Approach 2:
The complex multi-axis mechanical linkage is substituted with a simple linear sliding mechanism. The horizontal sliding member moves only in one direction (horizontally) to achieve contact connection, replacing what could have been a complex multi-dimensional mechanical system with a straightforward linear actuation driven by spring force.
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 proposed GFCI design provides a stable and reliable reverse connection-proof function, preventing unsafe operation and ensuring correct reset functionality, thereby enhancing safety and usability.
Implementation Method 1
when the coil conducts instantaneous current, the iron core generates magnetism and attracts the rotating piece to rotate
Implementation Method 2
the permanent magnet attracts the iron core
Implementation Method 3
compresses a second spring encircling the iron core and causes the permanent magnet to attract the iron core
Data Source
AI summary
The present invention discloses a ground fault circuit interrupter including a lower cover, an upper cover, a base seat, a tripping mechanism, a resetting key, a test key, a pair of movable contacts, a pair of first static contacts fixed on the base seat, a pair of second static contacts fixed on the supporting frame, a first locking mechanism and a control circuit board; the base seat includes a supporting frame, the tripping mechanism includes an elastically-movable main frame, a spring, a coil fixing frame connected to the main frame, a coil encircling said coil fixing frame, an iron core arranged inside said coil fixing frame and said coil, a horizontal sliding member fixedly connected with one end of the iron core, a permanent magnet arranged on the other end of the main frame; the movable contacts are elastically installed on the main frame.