CURRENT REGULATION CIRCUIT, POWER OVER ETHERNET SYSTEM, AND METHOD

摘要

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.

主权项

1. A current regulation circuit for a plurality of power over Ethernet (POE) ports in parallel to drive a network device, the current regulation circuit comprising a plurality of current regulation units corresponding to the plurality of POE ports, each of the current regulation units regulating output current signals of the corresponding POE port, each of the current regulation units comprising:
a sampling unit connected to the corresponding POE port, the sampling unit outputting sampling current signals according to the output current signals of the POE port; a mean conversion unit connected to the sampling unit, the mean conversion unit converting the sampling current signals output by the sampling unit into mean current signals; a current integration unit connected to the mean conversion unit, the current integration unit integrating and converting the mean current signals output by the plurality of current regulation units to output reference current signals; a comparison unit connected to the mean conversion unit and the current integration unit, the comparison unit comparing the mean current signals output by the mean conversion unit with the reference current signals output by the current integration unit and outputting comparison signals based on the comparison; and a voltage conversion unit connected to the sampling unit and the comparison unit, the voltage conversion unit regulating the output current signals of the POE port according to the comparison signals output by the comparison unit.