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What kind of relationship exists between the LAN interface and the pulse transformer


The pulse transformer is added to the LAN module as one of the important components

The trend of 5G high-speed network has also led to the need for higher transmission speeds (1Gbps to 10Gbps) for wired communications. IT equipment such as computers using Ethernet as the mainstream LAN terminal has become one of the standard items, and there is a need for pulse transformers compatible with these systems. The quantity has increased greatly, so the pulse transformer is an important component in the LAN module. Its role is not only to transmit the signal, but also to insulate the current input and output. The LAN connector is RJ45. There are common mode choke coil, pulse transformer, and transceiver chip inside the LAN adapter. At this time, the RJ45 connector, common mode choke coil and pulse transformer are equipped as a miniature module, called LAN connector , Pulse transformer mainly exists to transmit pulse waveform signals. It is very different from general power transformers. The main force is not transmitting power, so the size design can be miniaturized and built into the connector.


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Principle and characteristics of pulse transformer

Pulse transformers are mainly used in electronic equipment, switching power supplies, wireless communications and pulse circuits. Its working principle uses the magnetic saturation characteristics of the iron core to convert the input sine wave voltage into a narrow pulse-shaped output voltage transformer. It can operate at low frequency or high frequency In order to ensure the quality of the output pulse, design engineers must reduce the problem of excessive eddy current caused by too high magnetic induction change rate. In the selection of core materials, high-permeability materials such as manganese-zinc ferrite or permalloy will be used. In order to reduce the size of the core and reduce the number of winding turns, because the power of the pulse transformer is small, the primary winding is mostly one group in the design structure, and the secondary winding is two or more (can output multiple voltages). The primary coil and the secondary coil are folded into multiple groups of units and placed alternately.