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Do network transformers have directions?

Views : 74
Author : CETUS INTL
Update time : 2023-08-29 14:06:51
Do you also have this question: Does the network transformer have a direction? But sure, so what about the direction of the network transformer? This article will reveal the answer.

First, the direction of the network transformer mainly refers to which direction the common mode inductance of the network transformer is in.
For the current-driven PHY, the 2-wire common mode inductor can only be placed on the cable (RJ45) side.
For a voltage-driven PHY, the 2-wire common mode inductor can be placed on the PHY side or the cable side.
For example: the line structure of the common mode inductance of the network transformer on the RJ45 side

The circuit structure of the common mode inductance of the network transformer on the PHY side
For the current-driven PHY, the 3-wire common mode inductor should be placed on the PHY side.
For a voltage-driven PHY, the 3-wire common mode inductor should be placed on the PHY side.

Network transformer with 2-wire common mode + autotransformer, which is equivalent to the direction on the RJ45 side
For current or voltage driven PHY, if it is in the form of 2-wire common mode inductor + autotransformer, the autotransformer should be placed on the RJ45 side.

Do network transformers have directions?

How to connect the taps of the network transformer:
The center tap of the network transformer connected to the current-driven PHY is connected to VCC, which is the power supply voltage of the PHY.
The center tap of the network transformer connected to the voltage-driven PHY is connected to the ground capacitor.

The above is the answer to whether the network transformer has direction! I hope it will help you who are wondering whether the network transformer has a direction.