Ethernet transmission circuit

Abstract

The invention discloses an Ethernet transmission circuit. The Ethernet transmission circuit comprises an Ethernet interface, a first isolation transformer, a second isolation transformer and a protocol conversion chip; the output end of the Ethernet interface is connected to the input end of the first isolation transformer; the output end of the first isolation transformer is connected to the input end of the second isolation transformer; the output end of the second isolation transformer is connected to the protocol conversion chip; the first isolation transformer is connected to an EMC enhanced circuit with a power supply unit; and an EMC enhanced protection circuit is connected between the first isolation transformer and the second isolation transformer. A differential signal received by the Ethernet interface is enhanced and protected through the EMC enhanced circuit connected onto the first isolation transformer and the EMC enhanced protection circuit between the first isolation transformer and the second isolation transformer, and fed into the protocol conversion chip; therefore, in the event that EMC compatible requirements are satisfied, the error rate for Ethernet communication and transmission is further reduced; the data transmission throughput capacity is increased; and the network delay is reduced.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an Ethernet transmission circuit. Background technique [0002] In the field of Ethernet communication and transmission, it is currently the most important communication mode to realize the power supply, data and command communication between the control device and the upper computer with the help of Ethernet. However, in the current Ethernet communication circuit, the transmission signal will be affected by the DC power supply in the twisted pair and the interference of the external electromagnetic environment, which will greatly increase the possibility that the transmission circuit will be damaged by EMC (ElectroMagnetic Compatibility, electromagnetic compatibility) electrostatic pulse, and If the current common EMC protection measures are adopted, such as anti-static tubes and filter capacitor networks, the equivalent capacitance to the ground of the transmission circui...

AI Technical Summary

Problems solved by technology

However, in the current Ethernet communication circuit, the transmission signal will be affected by the DC power supply in the twisted pair and the interference of the external electromagnetic environment, which will greatly increase the possibility that the transmission circuit will be damaged by EMC (ElectroMagneticCompatibility, electromagnetic compatibility) electrostatic pulse, and If the current common EMC protection measures are adopted, such as anti-static tubes and filter capacitor networks, the equivalent capacitance to the ground of the transmission circuit will increase, which will further lead to an increase in the bit error rate of Ethernet communication and transmission, and a decrease in the throughput of data transmission , the transmission delay phenomenon of Ethernet will further increase

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