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#1 Aug 25, 2017
decade1300
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Transformer choosing & setting problem

Hi,

I am using a transformer in my power system design, and my purpose is to amplify the voltage by 25 times. It would be better if the transformer model takes energy loss into consideration. Which 2-port transformer part should I use?

The part I currently use is XFRM_NONLINEAR.Normal. I need to set L1_TURNS & L2_TURNS. I know that their ratio would decide the output voltage. Then how would these absolute values affect the result? For example what's the difference between 1:25 and 20:500? 

The last problem is that the output voltage is much lower than expectation. Usually it's amplified by 10-15 times instead of 25 times. I have carefully control the ratio of input and output impedance to make them match, but the result is still unsatisfying.

 

Thanks:)

Sun, 2017-08-27 08:39
alok
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XFRM_NONLINEAR model usages a magnetic core - Toroid 33/20/11 core using 2P90 material. This may or may not be suitable for your application. Saturation of core could be one of the reasons for less than expected secondary voltage. Since this model does not have any winding resistance, I am not able to think of any other reason. However, it is difficult to comment accurately without actually looking at the actual circuit. 

1:25 means 1 turn in primary on above core and 25 turns in secondary. 20:500 would be 20 and 500 turns. 20 turns mean larger magnetizing inductance and thus lower operating B, low magnetizing current. It is just like an actual transformer with more number of turns in the primary winding. 

 

Mon, 2017-08-28 17:49 (Reply to #2)
decade1300
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Thank you alok! I am using XFRM_LINEAR.Normal now.

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When selecting and setting up a transformer for voltage amplification in your power system design, here are some considerations:
Transformer Model: It's important to choose a transformer model that accurately represents the behavior and characteristics of the transformer you are using. The XFRM_NONLINEAR.Normal model you mentioned seems to be a nonlinear transformer model. If energy loss is a concern, you may want to consider using a different model that incorporates loss information, such as XFRM_LOSSY.
Turns Ratio: The turns ratio of the transformer determines the voltage amplification. In your case, you aim for a voltage amplification of 25 times. The turns ratio is defined as the ratio of the number of turns in the secondary winding (L2_TURNS) to the number of turns in the primary winding (L1_TURNS). The turns ratio can be expressed as a fraction or as absolute values. For example, a turns ratio of 1:25 or 20:500 both represent the same voltage amplification. The absolute values of L1_TURNS and L2_TURNS determine the actual number of turns in the windings, but as long as the turns ratio is correct, the voltage amplification will be achieved. rankdle

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You mentioned that you're currently using XFRM_NONLINEAR.Normal. This suggests you're considering nonlinear behavior in your transformer, which is crucial for accurate modeling, especially when dealing with energy loss. This model likely includes parameters for core 

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