Bidirectional PoE Network Interface for Reversible Power Flow
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Solution Overview
Problem
Existing Power over Ethernet (PoE) technologies are limited to unidirectional power flow, making them unsuitable for devices that need to alternate between being a power source and a load, such as energy storage devices, and require costly dual interface setups with safety risks.
Innovation Solution
A bidirectional network interface apparatus that allows reversible electrical power transmission over wired telecommunications networks, featuring a rectifier, power distribution bus, and controllers to manage power flow, enabling devices to switch between power source and load modes safely and efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single PoE-compliant network interface is used, then the device structure is simple and cost-effective, but the interface cannot switch between power source and load modes
Solution Approach 1:
The network interface is designed with dynamic switching capability that allows it to change its operational mode between power source and power load during runtime. The controller selectively activates different circuit paths (forward path for power delivery, reverse path for power reception) based on operational requirements, enabling a single interface to adapt to different power flow directions without requiring multiple fixed interfaces
Solution Approach 2:
The network interface is designed as a multi-functional component that can perform both power delivery and power reception functions through a single physical interface. By incorporating bidirectional power transmission capability with selective activation of forward and reverse power paths, the interface serves multiple purposes (power sourcing and power receiving) that traditionally required separate dedicated interfaces
2Adaptability or versatility
If two PoE-compliant network interfaces are installed to enable bidirectional power flow, then power source and load functions are available, but the cost increases and safety issues arise from improper connection
Solution Approach 1:
The patent merges the functionality of two separate PoE interfaces (one for power delivery, one for power reception) into a single unified network interface. The controller intelligently manages the combination by selectively activating the forward power path or reverse power path based on operational mode, eliminating the need for two physically separate interfaces while maintaining both power source and load capabilities
Solution Approach 2:
The controller acts as an intermediary management component that coordinates the bidirectional power transmission through the single network interface. It selectively activates appropriate circuit paths (forward path with first switch, reverse path with second switch) based on operational requirements, ensuring safe and proper power flow direction without requiring manual configuration or dual interfaces
3Reliability
If bidirectional power transmission is implemented with selective path activation, then safe power flow control is achieved, but additional control circuitry and switches are required
Solution Approach 1:
The control circuitry is designed with dynamic switching capability that selectively activates only the necessary circuit paths based on operational mode. The controller dynamically opens or closes specific switches (first switch for forward power path, second switch for reverse power path) to enable the required power flow direction while keeping other paths inactive, minimizing the active complexity at any given time
Solution Approach 2:
The controller is configured to preliminarily determine the required power flow direction before activating the corresponding circuit path. By预先 selecting and preparing the appropriate switch state (first switch for PSE mode, second switch for PD mode), the system ensures safe power flow control is established before power transmission begins, preventing improper connections or unsafe operating conditions
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
Enables safe and efficient bidirectional power transfer in networking devices, allowing them to act as both power sources and loads, reducing costs and safety hazards associated with dual interface setups, and supporting advanced network topologies like closed ring topologies.
Implementation Method 1
a rectifier connected to the connection portion and comprising a plurality of rectifier elements, such as diodes
Data Source
AI summary
A network interface apparatus includes: a connection portion adapted to connect the interface apparatus to a wired telecommunications network; a rectifier connected to the connection portion; a power distribution bus connected to the rectifier; a first power controller; a second power controller; a first switch coupled to the first power controller and configured to selectively prevent electrical currents from flowing between the connection portion and the power distribution bus, and a second switch and a third switch each respectively coupled to the second power controller and configured to selectively prevent electrical currents from flowing from the power distribution bus to the connection portion, wherein the second switch is connected in parallel with a rectifier element of the rectifier and the third switch is connected in parallel with a second rectifier element of the rectifier.