Protective Wiring Device Isolation and Heat Management
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Solution Overview
Problem
Current electrical wiring devices face challenges in reducing surface tracking and cross-talk between high voltage and low voltage components on printed circuit boards (PCBs) without increasing PCB surface area, while also managing heat rise and maintaining reliability.
Innovation Solution
The design incorporates a housing assembly with a separator portion and a latch block assembly that includes a solenoid assembly to decouple the latching element from the reset pin upon fault detection, reducing the number of conductive segments in the AC conductive path and isolating high voltage components from low voltage ones, thereby mitigating surface tracking and cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high voltage components are placed closer to low voltage components on a single PCB to increase component density, then device functionality and component integration are improved, but surface tracking and cross-talk between voltage circuits increase
Solution Approach 1:
A separator portion is introduced as an intermediary element between high voltage and low voltage circuit boards. This separator includes a reset pin guide portion that physically guides and electrically isolates the reset pin, preventing surface tracking while maintaining functional connectivity. The separator acts as a mediator that allows close proximity of voltage circuits without direct electrical contamination between them.
Solution Approach 2:
The device is divided into separate high voltage circuit board and low voltage circuit board segments, with each board handling specific voltage ranges. This segmentation prevents cross-talk and surface tracking by creating physical and electrical boundaries between different voltage domains, while still allowing integrated functionality through controlled interfaces.
2Loss of energy
If the number of conductive segments in the AC conductive path is reduced to minimize heat rise, then energy loss is improved, but device complexity increases
Solution Approach 1:
Multiple conductive segments are merged into integrated conductive paths within the circuit board designs. By combining series-connected resistive elements into unified traces and pathways, the total number of interconnections is reduced, minimizing cumulative heat generation while maintaining the same electrical functionality through optimized board-level routing.
3Reliability
If additional protective capabilities and functionality are added to meet consumer demands, then device reliability and safety are improved, but device size increases
Solution Approach 1:
The separator portion serves multiple functions simultaneously: it provides mechanical support for the reset pin, creates electrical isolation between voltage circuits, guides pin alignment during assembly, and prevents surface tracking. This multi-functionality allows comprehensive protective capabilities without proportionally increasing device volume, as a single structural element accomplishes multiple safety and functional objectives.
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 solution effectively prevents voltage surges from damaging small signal components, increases electronic component density on the PCB, and reduces heat rise, while maintaining device reliability and preventing unwanted electrical currents from causing failures or fires.
Implementation Method 1
a latch block assembly including a central latch block portion configured to accommodate the reset pin and a latching element, the central latch block portion including an open side configured to accommodate the reset pin guide portion
Data Source
AI summary
The present invention is directed to electrical wiring device that includes: a housing including a cover and a back body, the housing further including a plurality of line terminals and a plurality of feed-through load terminals, a plurality of receptacle load terminals substantially aligned with a plurality of receptacle openings; a fault protection circuit disposed inside the housing, having sensing components mounted to one side of a first PCB, the fault protection circuit being configured to provide a fault detection signal in response to detecting at least one type of predetermined fault condition; a circuit interrupter disposed inside the housing, the circuit interrupter being configured to couple the plurality respective terminals in response to a reset stimulus being applied to a reset button, the circuit interrupter being configured to decouple the respective plurality of terminals in a second state when the latching element and a reset pin are decoupled in response to the fault detection signal; and an indication circuit having an indicator to alert the user of device status.