Multisim and Ultiboard

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transformer with dual secondaries using two coupling coefficients in an arbitrary spice block.

Hello:I'm trying to model a transformer with dual secondaries using two coupling coefficients in an arbitrary spice block.  It seems the simulator doesn't like two couplidng coeffients such as K1 lL101 lL102 .99 and K2 lL101 lL103 .99., one right after the other.  How can I model a dual secondary transformer with coupling coefficints?

Please see the attached sample circuit.

Thanks,

ronquan

 

.

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If you are trying to couple all three windings you can use either a three 2-inductor coupling coefficient statement or one 3-inductor coupling coefficient statement. For example:

 

k1 L1 L2 0.99

k2 L2 L3 0.99

k3 L1 L3 0.99

 

or

 

K1 L1 L2 L3 0.99

 

by the way, if your Multisim tier allows it, you can use the INDUCTOR_COUPLING component and do this all on the schematic instead of using the arbitrary spice block.

 

Thanks

 

 

 

Max
National Instruments
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Hello Max,

 

Im using Multisim 11.0 and I cant find the INDUCTOR_COUPLING component (yes, after hours of searching the component part).

 

Any idea where I can get it?

 

Thanks

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It is under the Basic group, BASIC_VIRTUAL family. It looks like you found it based on the circuit you posted in another thread

Max
National Instruments
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Yes, I upgraded my version to 12.0.1 and it has that block I'm looking for. I'm building a flyback smps based on a schematic you posted earlier in the other thread. This is a little off topic, but can't seem to achieve desired output with it. I'm not very good with Multisim. Would you mind having a look, Max?

 

Thank you very much.

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