Current Transformer Test Wire Layout for One-Step PCB Assembly
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Solution Overview
Problem
The assembly of current transformers for Ground Fault Circuit Interrupt (GFCI) devices is complex due to the manual insertion and soldering of test wires, which requires careful manual placement and can lead to disconnection or improper positioning, complicating the manufacturing and installation process.
Innovation Solution
A current transformer design featuring a housing with a toroidal core and pin housings on the front face, where a test wire passes through a central opening and is electrically connected to conductive pins, allowing for simplified assembly and connection to a printed circuit board (PCB) in a single step, reducing the risk of misplacement and disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual insertion and soldering of test wire is used, then the current transformer can be assembled, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The test wire is integrated with the housing structure by passing it through a channel formed in the housing itself, merging the wire routing function into the housing. This eliminates the need for separate manual insertion and positioning steps, allowing the test wire to be automatically positioned during assembly while reducing manufacturing time.
2Reliability
If manual insertion and soldering of test wire is used, then the current transformer can be assembled, but the process requires careful manual placement and inspection
Solution Approach 1:
The housing channel structure provides self-guiding features that automatically position the test wire correctly during assembly. The channel's geometry ensures proper wire routing without requiring external fixtures or careful manual placement, allowing the assembly process to self-correct and eliminate the need for complex inspection steps.
3Reliability
If test wire is manually inserted through opening, then electrical connection can be established, but the test wire may become disconnected or improperly positioned
Solution Approach 1:
The test wire is nested within a channel formed in the housing structure, with the wire passing through a defined path that guides and secures it in position. This nested configuration protects the wire from displacement and ensures reliable electrical connection to the circuit board without requiring complex external retention mechanisms.
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
This design simplifies the assembly process by enabling reliable and efficient connection of the current transformer to the PCB, reducing manufacturing time and ensuring accurate positioning, thereby enhancing the operational reliability of GFCI devices.
Implementation Method 1
A secondary wiring is disposed about the transformer core and is configured to generate a current in response to an imbalance of magnetic flux in the transformer core
Data Source
AI summary
A current transformer includes a housing including generally cylindrical outer and inner walls defining an internal chamber, a front face enclosing one end of the internal chamber, a base, and a central opening defined by the inner wall. A generally toroidal current transformer core is disposed within the internal chamber. A secondary wiring is disposed about the transformer core and is configured to generate a current in response to magnetic flux in the transformer core. A pin housing is disposed on the front face of the housing adjacent the base. The pin housing has electrically conductive pins. A test wire passes through the central opening. The secondary wiring is electrically connected to a first pair of the pins and the test wire is electrically connected to a second pair of the pins.