POE Current Regulation Circuit Equalizing Port Impedance
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Solution Overview
Problem
Current power over Ethernet (POE) systems face limitations in supplying maximum power to network devices due to varying cable impedances, which results in unequal current signals across POE ports, preventing them from delivering the required power efficiently.
Innovation Solution
A current regulation circuit with multiple current regulation units and an O-ring diode is introduced, which samples, integrates, and compares current signals from POE ports with different impedances to ensure equal current output, using feedback and isolation mechanisms to regulate and synchronize the power delivery according to IEEE standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple POE ports supply power in parallel to network devices requiring large power, then the power supply capacity is improved, but the current signals become unequal due to different cable impedances
Solution Approach 1:
The patent implements feedback control by sampling current signals from each POE port through sampling units, comparing them via comparison units, and adjusting the output of power supply units based on the comparison results. This closed-loop feedback mechanism ensures that current signals from multiple POE ports remain equal despite different cable impedances, resolving the contradiction between improved power supply capacity and maintained current signal equality.
Solution Approach 2:
The patent dynamically adjusts the output parameters of power supply units based on real-time current signal measurements. By changing the output current parameters of individual POE ports according to their specific cable impedance characteristics, the system maintains equal current distribution across all ports while providing enhanced total power capacity.
2Device complexity
If POE ports output current signals directly without regulation, then the device complexity is reduced, but the power delivery efficiency deteriorates due to impedance mismatches
Solution Approach 1:
The patent segments the POE port into functionally independent units: power supply units, sampling units, comparison units, and adjustment units. Each segment performs a specific function in the current regulation process. This modular segmentation enables efficient power delivery through regulated current signals while keeping each individual unit relatively simple, thus resolving the contradiction between device complexity and power delivery efficiency.
Solution Approach 2:
The patent introduces intermediary components including sampling units that measure current signals, comparison units that evaluate differences, and adjustment units that modify output. These intermediaries mediate between the power supply and the network device, ensuring optimal power delivery efficiency by compensating for impedance mismatches without requiring complete redesign of the entire system.
Data Source
AI summary
A current regulation circuit includes a number of current regulation units. Each of the current regulation units includes a sampling unit, a mean conversion unit, a current integration unit, a comparison unit, and a voltage conversion unit. The sampling unit outputs sampling current signals according to output current signals of a POE port. The mean conversion unit converts the sampling current signals into mean current signals. The current integration unit integrates and converts the mean current signals output by the number of current regulation units into output reference current signals. The comparison unit compares the mean current signals with the reference current signals, and outputs comparison signals based on the comparison. The voltage conversion unit regulates the output current signals according to the comparison signals output by the comparison unit. A POE system and method are also provided.