POWER OVER ETHERNET PORT PROTECTION CIRCUIT AND ETHERNET POWER SUPPLY EQUIPMENT

摘要

Disclosed are a power over Ethernet port protection circuit and Ethernet power supply equipment, the port protection circuit comprising: a first common mode protection device, a second common mode protection device and m number of rectifier bridges, where m equals the number of ports, the rectifier bridges are in one-to-one correspondence with the ports; the first input end and the second input end of each rectifier bridge are respectively connected to the first direct current output end and the second direct current output end of a power over Ethernet (PoE) control chip; the first output end or the second output end of each rectifier bridge is connected to the idle signal line of the corresponding port, the idle signal line is an uncharged signal line; one end of the first common mode protection device is connected to the first output end of each rectifier bridge, and the other end is grounded; and one end of the second common mode protection device is connected to the second output end of each rectifier bridge, and the other end is grounded. The present invention can effectively solve the problem of common mode overvoltage converting into differential mode overvoltage due to inconsistent actions of the protection devices in the prior art, and has better safety.