PoE Power Sourcing Equipment Chip Impedance Detection
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Solution Overview
Problem
Conventional Power over Ethernet (PoE) devices that use four cable pairs to supply power cannot determine if the peer end is connected to a powered device (PD), preventing power delivery.
Innovation Solution
A power sourcing equipment chip with channel controllers and detectors that send detection voltages along multiple cable pairs to determine impedance and capacitance, allowing power to be supplied only to valid PDs connected via specific impedance ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If four cable pairs are used to supply power to meet higher power requirements, then power delivery capability is improved, but the ability to detect and determine peer end status deteriorates
Solution Approach 1:
The patent divides the four cable pairs into two separate groups (first group: cable pairs 1-2, second group: cable pairs 3-6) and assigns separate detection mechanisms to each group. The first channel detector is configured to detect status along the first group of cable pairs, while the second channel detector detects status along the second group. This segmentation allows independent detection of each cable pair group's peer end status, resolving the detection difficulty when using all four cable pairs for power delivery.
2Productivity
If conventional PSE detection methods are used with four cable pairs, then power supply capacity is improved, but detection accuracy and reliability worsen due to inability to determine peer end status
Solution Approach 1:
The patent segments the detection function into two independent channel detectors, each responsible for one group of cable pairs. The first channel detector monitors the first group (cable pairs 1-2) and the second channel detector monitors the second group (cable pairs 3-6). This segmentation enables accurate determination of peer end status for each cable pair group independently, ensuring reliable detection even when all four cable pairs are utilized for power delivery.
Solution Approach 2:
The patent implements feedback mechanisms where each channel detector continuously monitors its assigned cable pair group and provides status information to the power sourcing equipment controller. Based on this feedback, the controller can dynamically adjust power distribution, determine which cable pairs have valid peer ends connected, and make informed decisions about power delivery. This feedback loop ensures both high power supply capacity and accurate detection reliability.
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 power delivery to PDs connected via four cable pairs by accurately determining the status of the peer end, ensuring safe and efficient power supply.
Implementation Method 1
The channel controller determines a first impedance according to the first detection voltage and a current that is detected by the first channel detector
Implementation Method 2
when the resistance falls within a range from 19 kilohms to 26.5 kilohms (kΩ) and the capacitance is less than 0.150 microfarad (μF)
Implementation Method 3
Power over Ethernet (PoE) is a technology using a twisted pair to both transmit Ethernet data and supply electric power
Data Source
AI summary
A power sourcing equipment (PSE) chip, and a Power over Ethernet (PoE) device and method are provided, which can determine a status that a peer end is connected to a powered device (PD) when four cable pairs are used to supply power. The PSE chip includes a channel controller, a first channel detector, and a second channel detector. The channel controller sends detection voltages along a first and a second groups of cable pairs in an Ethernet twisted pair; determines a first impedance and a second impedance according to the detection voltages and corresponding currents that are detected; and determines that a first group or a second group of cable pairs is connected to a valid PD according to the impedances and a preset range.