Receptacle GFCI Reverse Wiring Protection and Contact Reliability
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Solution Overview
Problem
Current receptacle type ground fault circuit interrupters (GFCIs) face issues with unreliable contact due to high machining precision requirements and are prone to reverse wire connections, leading to ineffective leakage protection and potential safety hazards.
Innovation Solution
A GFCI design incorporating a reset key with a locking mechanism, a sliding reset bracket, and an electromagnetic tripping mechanism, along with a reverse wiring protection device using a reed switch and actuator bracket, ensures reliable contact and prevents power output in case of reverse wiring by disconnecting conductive pads from output stationary contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the movable contacts are provided at the free end of conductors with fixed other ends, then the GFCI structure is simple, but the contact reliability is poor due to high machining precision requirements
Solution Approach 1:
The patent transforms the static fixed-contact structure into a dynamic spring-loaded structure where the movable contact can elastically deform to ensure reliable contact. The spring component allows the contact to adapt to positioning tolerances and maintain consistent contact pressure, resolving the reliability issue while keeping the overall structure simple.
Solution Approach 2:
The patent changes the mechanical parameters of the contact system by introducing elasticity through spring components. This allows the contact system to compensate for dimensional variations and machining tolerances, ensuring reliable electrical connection without requiring extremely high machining precision.
2Ease of manufacture
If the power input connection assembly and load connection assembly are made similar, then the manufacturing process is simplified, but reverse wire connection occurs leading to safety hazards
Solution Approach 1:
The patent introduces asymmetric identification features (such as different colored markings or structural differences) on the otherwise similar connection assemblies. This allows the assemblies to remain manufacturable with similar processes while providing visual or structural cues to prevent reverse wire connection during installation.
Solution Approach 2:
The patent incorporates a detection mechanism that provides feedback when reverse wiring is detected. The system can identify the incorrect connection configuration and prevent operation or alert the installer, thereby eliminating the safety hazard while maintaining manufacturing simplicity.
3Ease of operation
If the GFCI allows reset operation in reverse wire condition, then the ease of operation is improved, but the safety protection function is compromised
Solution Approach 1:
The patent implements a preliminary detection mechanism that checks wiring correctness before allowing the reset operation to take effect. The system detects reverse wiring conditions in advance and blocks the reset function, preventing the harmful effect from occurring while maintaining normal operation when wiring is correct.
Solution Approach 2:
The patent introduces an intermediary control mechanism (such as a control circuit or switching element) that mediates between the reset button and the actual circuit restoration. This intermediary checks wiring conditions and only permits reset when proper wiring is detected, ensuring safety while preserving ease of operation under normal conditions.
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 solution provides reliable contact and effective reverse wiring protection, preventing electric shocks and property damage by ensuring no power output in reverse wiring conditions, thus enhancing safety and product stability.
Implementation Method 1
electromagnetic tripping mechanism that acts as controlled by the said leakage signal detection circuit
Implementation Method 2
reverse wiring protection device using a reed switch and actuator bracket
Data Source
AI summary
A ground fault circuit interrupter comprises a reset key, a reset locking mechanism, a reset mechanism, a reset bracket, a bracket reset mechanism, a bracket homing mechanism, a reset linkage mechanism, and a reset linkage clutching mechanism. A conductive assembly is configured to selectively connect or disconnect electrical continuity between the power input side and the load side. The conductive assembly comprises pairs of short-circuit conductive strips with conductive movable contacts, power input connection assemblies with input conductive stationary contacts, wiring output assemblies, receptacle output assemblies with output stationary contacts, and a first short-circuit conductor and a second short-circuit conductor. A reverse wiring protection device comprises an electromagnetic generating device having a power supply sub-circuit and an electromagnetic actuator bracket configured to selectively close first normally open switch and second normally open switch and further configured to open first normally closed switch and second normally closed switch.