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how to maesure secondary inductor value of Transformer in cst

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myjae

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i wonder if how to maesure L value of Secondary inductor.
i thought edge of Primary & secondary inductor make port.

each of Primary edge is port 1, port 2
each of secondary edge is port 3, port 4

there is 4 port then

L=l imaginary 1,1 l / 2*pi*f i thought can calculate L value.


this is right?
12.jpg
 

Measure pri L, then mult x turns^2 for sec L, assuming 1 turn pri.
 

i want measure secondary L.
 

In most cases, a transformer will be described as two port rather than 4 port. Analyzing the winding terminals as two port makes sense for RF transformers with differential connection, e.g. a balun. But it's not useful for determining simple parameters like inductance.

As for your calculation, which kind of port parameters do you refer to with "1,1"? Z, S, whatsoever? Also which inductance value are you measuring? Lh, Ls?
 

I don't think there is a way to measure inductance in CST. You can simulate frequency of the coils and calculate the inductance of the coil using the formula you have given.

the coils shouldn't be 4 ports but only 2 ports. you can connect one edge port between two terminals in the primary coil and one edge port between the two terminals of the secondary coil.

please update me about the results.
 

The easiest way is to connect an inductance meter to the sec - this will give you the L of the sec in seconds...
 

Easy peasy said:
The easiest way is to connect an inductance meter to the sec - this will give you the L of the sec in seconds...
Click to expand...

In the title of this thread, CST is mentioned which is a simulation tool.

I agree that reducing the model to a 2-port is the easiest way to evaluate inductance, with Y/Z parameters. For secondary inductance with primary coil open, evaluate Z22.
 

cc.jpg

i appreciate opinion of your.
i make 2 port.
first, primary port is 1 port and open port ,also secondary port is 1 port and open port.

secondary inductor is calculate result of Z22
L= image Z2,2 / 2 * pi * f right??
 

No, your ports are wrong. How can current flow there, with 4 ports where all port grounds are floating?

Use lumped port between the ends of each coil.
 
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    myjae

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pls follow the instruction i have given. you have 4 ports which is wrong. the port is waveguide port whereas u need edge port as i mentioned earlier.
 
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    myjae

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um... i serch to various opinion.
how to make edge port in CST?
there are Wave,discret,plane,lumped port.
 
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myjae said:
how to make edge port in CST?
Click to expand...

Not sure what pragash means, but let me repeat: Use lumped port between the ends of each coil, so that current can actually flow through the coils.
 
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    myjae

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myjae said:
um... i serch to various opinion.
how to make edge port in CST?
there are Wave,discret,plane,lumped port.
Click to expand...

its Discrete edge port or discrete port.
 
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    myjae

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