Power Over Data Transmission Device With Shared Protection Components
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Solution Overview
Problem
Existing power over Ethernet technologies face challenges in balancing DC current on twisted pairs, leading to significant power loss and component bulkiness, which is critical in weight-sensitive applications like aeronautics where safety and weight reduction are paramount.
Innovation Solution
A power transmission device that incorporates a protection device with shared components, including transistors, to balance and trip the electrical current on conductors, utilizing a control circuit to manage transistor conduction and minimize power loss, thereby ensuring safe and efficient electricity transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-value resistances are used to balance DC current in the twisted pair, then current balancing is achieved, but significant power loss occurs in the resistances
Solution Approach 1:
The patent changes the electrical parameters by using controlled current sources instead of fixed high-value resistances. The current sources are regulated to provide precise current balancing while minimizing power dissipation, directly addressing the contradiction between achieving balance and reducing energy loss
Solution Approach 2:
The patent replaces the passive resistive balancing mechanism with an active electronic control system using controlled current sources. This substitution allows for precise current regulation without the inherent power loss of high-value resistors, resolving the energy efficiency issue while maintaining balancing reliability
2Reliability
If sophisticated balancing methods with many components are used, then current asymmetry is compensated, but the balance circuit becomes heavier and more complex
Solution Approach 1:
The patent merges the balancing function with the protection device by integrating controlled current sources into the existing protection circuitry. This consolidation achieves current asymmetry compensation without adding separate complex balancing circuits, reducing overall device complexity while maintaining compensation effectiveness
Solution Approach 2:
The protection device is designed to perform multiple functions simultaneously: protection, current balancing, and asymmetry compensation. By making the protection device universal, the patent avoids adding dedicated complex balancing components, thereby reducing device complexity while achieving reliable current asymmetry compensation
3Reliability
If separate protection and balancing circuits are used, then safety requirements are met, but weight and component bulk increase
Solution Approach 1:
The patent combines separate protection and balancing circuits into a single integrated protection device. This merger maintains all necessary safety functions while eliminating redundant components, directly reducing weight and component bulk without compromising safety requirements
Solution Approach 2:
The integrated protection device performs multiple safety-related functions simultaneously: overcurrent protection, current balancing, and asymmetry compensation. By consolidating these functions into one multi-functional device, the patent reduces overall component weight while meeting all safety requirements
Data Source
AI summary
The invention relates to a power transmission device capable of transmitting electricity supplied by an electricity source to at least one powered device connected to said transmission device by means of a communication network, via at least one data transmission cable including at least one pair of conductors, the electrical current being conveyed on the at least one pair of conductors. The power transmission device according to the invention includes, for each connected powered device, a protection device capable of tripping to protect the electricity source in case of electrical malfunction of the powered device as well as balancing of the electricity conveyed on the at least one pair of conductors, said protection device including at least one shared component contributing both to performing said trip and said balancing.