Insulating Ribs for Isolation Boundary Withstand Voltage
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Solution Overview
Problem
Electronic communication network devices face challenges in maintaining an effective isolation boundary between primary and secondary power circuits, particularly in withstanding surge voltages and preventing arcing, which can be exacerbated by space constraints and the accumulation of contaminants, while also seeking to reduce manufacturing costs and complexity.
Innovation Solution
The integration of insulating ribs made from materials with better insulating properties than air, protruding through slots in the circuit board, enhances the withstand voltage capability of the isolation boundary, providing a more robust arc resistance without increasing manufacturing costs or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a slot is placed in the circuit board to prevent arcing, then arcing resistance is improved, but the manufacturing complexity increases
Solution Approach 1:
An insulating rib is introduced as an intermediary component that protrudes through the slot in the circuit board. This rib provides additional insulation between primary and secondary circuits, enhancing arcing resistance without requiring the slot to be enlarged or made more complex. The rib acts as a mediator that fills the isolation gap and prevents arc formation.
2Reliability
If the slot is extended to increase arc path length, then breakdown voltage is improved, but the device area increases
Solution Approach 1:
Instead of extending the slot length in the planar direction (2D), the insulating rib protrudes through the slot in the vertical dimension (3D). This creates an additional insulation barrier without increasing the footprint area of the circuit board. The rib extends the arc path in the vertical direction while maintaining a compact horizontal footprint.
3Ease of manufacture
If air gap is used for isolation, then manufacturing simplicity is maintained, but dielectric strength is insufficient
Solution Approach 1:
The isolation structure combines air gap and insulating rib materials to create a composite insulation system. The air gap provides basic isolation and ease of manufacturing, while the insulating rib material (with higher dielectric strength than air) enhances the overall dielectric performance. This composite approach maintains manufacturing simplicity while significantly improving dielectric strength.
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 significantly increases the breakdown voltage and reduces the likelihood of arcing by creating a continuous and robust insulation boundary, leveraging the higher dielectric strength of the ribs to ensure reliable performance in electric devices.
Implementation Method 1
insulating ribs made from materials with better insulating properties than air... leveraging the higher dielectric strength of the ribs to ensure reliable performance
Data Source
AI summary
Insulating ribs are formed into one or more portions of a housing that encloses circuitry of an electrical device. Components mounted on a board are separated according to whether they are related to a primary side of a power transformer or a secondary side. Primary related components are typically mounted on the primary side of an isolation slot formed into a circuit board and components related to the secondary are mounted on the other side. The insulating ribs are strategically placed to protrude through the slots when circuit board is mounted to the housing portion. Thus, when the housing portion is joined to another housing portion, which also may include insulating ribs strategically placed, the ribs increase the breakdown voltage of the boundary.