Foamed PVDF Jacket for High-Temperature PoE Cables
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Solution Overview
Problem
Conventional Power over Ethernet (PoE) cables with PVC jackets are limited by a maximum temperature rating of 105°C, restricting the transmission of higher power signals and bandwidth, and materials like PVDF negatively impact electrical performance due to their dielectric constant and dissipation factors.
Innovation Solution
The use of foamed polyvinylidene fluoride (PVDF) jackets and fluorinated ethylene propylene (FEP) insulation in twisted pair communication cables, which allows for higher temperature ratings up to 150°C and mitigates the adverse effects on electrical performance, enabling the transmission of higher amperage and power signals while meeting electrical and fire safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If PVDF material is used for cable jacket to increase temperature rating, then temperature resistance is improved, but electrical performance deteriorates due to dielectric constant and dissipation factors
Solution Approach 1:
The patent applies porous materials by using foamed PVDF instead of solid PVDF for the cable jacket. The foam structure introduces air pockets throughout the material, which reduces the overall dielectric constant and dissipation factor while preserving the high temperature resistance of PVDF. This resolves the contradiction by creating a material that has both high temperature rating and acceptable electrical performance for data transmission.
Solution Approach 2:
The patent uses composite materials by combining PVDF foam with a solid skin layer. The composite structure leverages the high temperature resistance of PVDF while the skin layer provides a smooth outer surface for better electrical performance and durability. This composite approach allows the cable to meet both temperature rating requirements and electrical performance standards.
2Power
If higher current and power signals are transmitted, then power transmission capability is improved, but cable degradation accelerates at sustained higher temperatures
Solution Approach 1:
The patent applies parameter changes by modifying the physical state of PVDF from solid to foamed structure. This changes the thermal and electrical parameters of the material, allowing it to withstand higher operating temperatures without degradation. The foamed structure reduces heat buildup during high power transmission, enabling sustained higher current and power signals without accelerating cable degradation.
3Ease of manufacture
If PVC material is used for cable jacket, then manufacturing ease is improved, but temperature rating is limited to 105°C
Solution Approach 1:
The patent applies parameter changes by transitioning from PVC to foamed PVDF material. This material substitution changes the temperature parameter from 105°C maximum to 150°C maximum, enabling higher power transmission capabilities. The foaming process maintains ease of manufacture similar to conventional PVC extrusion while achieving superior temperature resistance.
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 enables the transmission of higher amperage and power signals with improved temperature ratings and long-term durability without degradation, while satisfying Category 6 and Category 6A electrical performance standards and plenum fire safety requirements.
Implementation Method 1
The dielectric constant and dissipation factors of PVDF and similar materials adversely affect the electrical performance of the twisted pair conductors
Implementation Method 2
The insulation formed around each of the conductors of the twisted pair(s) may include fluorinated ethylene propylene (FEP)
Data Source
AI summary
A communication cable suitable for Power over Ethernet (“PoE”) applications may include one or more twisted pairs of individually insulated conductors that are insulated with a material that includes fluorinated ethylene propylene. Additionally, a jacket that includes foamed polyvinylidene fluoride may be formed around the one or more twisted pairs. The PoE cable may have a higher maximum temperature rating and be capable of transmitting higher amperage signals than conventional PoE cables while satisfying applicable electrical performance criteria.