Powered Device Single Interface PSE Type Recognition
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Solution Overview
Problem
Powered devices (PDs) require a single interface to differentiate between Ethernet Power Sourcing Equipment (PSE) and Direct Current (DC) PSE for power management, as their power circuits function differently, necessitating distinct interfaces for efficient power supply and detection.
Innovation Solution
The PD incorporates a recognition unit with a rectifier, control, and converter circuitry to identify the type of PSE by detecting voltage signals and impedance, allowing it to select appropriate operating voltages and supply power accordingly, using a full bridge rectifier and DC/DC converter to manage power from either Ethernet or DC PSE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate interfaces are used for Ethernet PSE and DC PSE power circuits, then power management reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the Ethernet PSE power circuit interface and DC PSE power circuit interface into a single unified interface. The recognition unit detects voltage characteristics to identify PSE type, and the control unit routes power appropriately through this single interface, eliminating the need for separate physical interfaces while maintaining reliable power management for both PSE types.
Solution Approach 2:
The single interface is designed with universal functionality to handle both Ethernet PSE and DC PSE power circuits. The recognition unit universally detects voltage characteristics regardless of PSE type, and the control unit universally manages power routing based on detected characteristics, making the interface adaptable to multiple power sources without requiring separate dedicated interfaces.
2Device complexity
If a single interface is used for both Ethernet PSE and DC PSE power circuits, then device complexity is reduced, but power detection precision deteriorates
Solution Approach 1:
The recognition unit acts as an intermediary between the single interface and the power management system. It detects voltage characteristics through the interface and translates them into reliable PSE type identification. The control unit then uses this information to appropriately route power, ensuring accurate detection despite the unified interface design.
3Speed
If voltage detection is performed without rectification, then response speed is improved, but measurement precision deteriorates
Solution Approach 1:
The rectifier unit performs preliminary rectification of detected voltage signals before they are processed by the control unit. This preliminary action converts AC voltage components to DC, ensuring accurate voltage level detection and PSE type identification. The rectification happens in advance of the decision-making process, enabling both speed and precision in power management.
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 efficient power management by identifying and adapting to either Ethernet or DC PSE, ensuring reliable power supply to PDs without the need for multiple interfaces, facilitating quick power disconnection and reconnection while minimizing startup errors.
Implementation Method 1
a rectifier unit (100), a recognition unit (102), a control unit (104)
Implementation Method 2
a converter unit (106), and a powered circuit (108)
Data Source
AI summary
A powered device is electronically connected to power sourcing equipment (PSE), to receive voltage signals from the PSE. The powered device comprises a rectifier unit, a recognition unit, a control unit, a converter and a powered circuit. The recognition unit identifies that the PSE is an Ethernet PSE or a DC PSE. The control unit controls whether the control unit output a negative voltage signal output by the rectifier unit, according to a positive voltage signal output by the rectifier unit and a identified result output by the recognition unit. The converter converts the negative voltage signal and the positive voltage signal to a working voltage of the powered circuit, to drive the powered circuit. To feed power by a single interface and identify that the PSE is the Ethernet PSE or the DC PSE, according to a simple circuit architecture.