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Old 6th May 2009, 07:01 PM   #1
ipop07 is offline ipop07  Canada
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Default LTSpice Simulation template?!

I am looking for a template electric diagram that allows me to simulate the results of various transformers. I am new to the SPICE simulation software in general but am trying to be able to "test" some transformers. I already have the transformer symbol with all the appropriate settings and files for addition of other transformers but have no circuit to test it on.

Could one of you be kind enough to a youngster that is trying to learn some?

I would greatly appreciate it.

peace&love
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Old 6th May 2009, 07:05 PM   #2
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You will find some LTSpice models here:
http://www.duncanamps.com/technical/ltspice.html
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Old 7th May 2009, 12:00 AM   #3
iko is offline iko  Canada
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My suggestion is that you start with a simple power supply simulation.

Build a schematic first:
1) voltage source, sine, 0V DC offset, 120V amplitude, 60Hz
2) three inductors, L1 will be transformer primary, L2, and L3, secondary windings. Include a spice statement
k0 L1 L2 L3 0.9992
which basically connects the three inductors. To do that, click on the menu button ".op" (upper right hand side)
3) connect L1 with the voltage source, making sure one of the ends is grounded; connect L2 and L3 in series. The middle point is the center tap. See attachment for the actual values. The transformer will step up from 120V to about 300V.
4) ground the center tap of the secondary of your transfomer
5) connect two diodes at the two outer ends of L2 and L3, anode (triangle) towards the transformer, and the cathode (vertical line) together
...

For details, see the attached file. Load it in ltspice, and run it. Play with it, change values, etc.
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File Type: zip psu-example-1.zip (842 Bytes, 72 views)
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Old 11th May 2009, 02:51 PM   #4
ipop07 is offline ipop07  Canada
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thanks guys, im going to try the example ikoflexer posted, i will come back with questions im sure of it...
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Old 12th May 2009, 01:18 AM   #5
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Quote:
Originally posted by ikoflexer
1) voltage source, sine, 0V DC offset, 120V amplitude, 60Hz
LTspice treats sine waves as peak values so in order to get 120Vrms you need to enter in 168V as the AC voltage.

dave
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Old 13th May 2009, 06:17 PM   #6
ipop07 is offline ipop07  Canada
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i just realized how little I know....
This is what I need to accomplish, and I have no clue how, not even how to start:

I need to make a circuit in which I can test a transformer, but be able to change it and test another with little work (as in not rebuilding another circuit)..
i need to accomplish this for an output transformer and a power transformer.

maybe a better example would be: if you were to ask a transformer manufacturer for a spice model for their transformer what would you ask for? So now if I put myself in the manufacturer's shoes how do I come up with such a model...not sure how to ask other than this..

i need this for a project I am working on and I have no clue how to come up with it...

P.S: i have loaded these files into ltspice: http://www.intactaudio.com/forum/vie...67ecbb8c966883
and I am guessing this would be great since it has a drop down menu to use...but how do I use it in the most simple way...
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