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Power Transformer Spice Model
Power Transformer Spice Model
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Old 19th July 2006, 06:13 PM   #1
classd4sure is offline classd4sure  Canada
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Default Power Transformer Spice Model

Hi,

Just wondering if anyone can help me out with a fairly accurate Pspice model of a toroidal power transformer.

It would be nice to able to model core saturation based on the level of DC present, and perhaps some of the parasitics as well.

Thanks,
Chris
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Old 19th July 2006, 10:59 PM   #2
jackinnj is offline jackinnj  United States
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Power Transformer Spice Model
the most straightforward transformer models just contain the inductances of primary and secondary and their coupling ratio together with the DC winding resistance -- you should add the leakage inductance of the secondary, and the capacitance between primary and secondary into your analysis.


here's a PhD thesis dealing with the topic:
http://www.eece.ksu.edu/vlsi/spiralmod/thesis.pdf

You can find Dr. Leach's article on his website -- just google it:
W. Marshall Leach, Jr., "SPICE models for vacuum-tube amplifiers," J. Audio Eng. Soc. Vol 43, No. 3, March 1995, p. 117


this is a little stray from what you are looking for -- but interesting nonetheless-- a way of getting a BH curve using LabView -- http://www.edn.com/contents/images/6294161.pdf

here's a non-linear transformer model from EWB:
[/i]
.SUBCKT nlt_pq_4_10 2 1 4 3
R0 2 5 66
L0 5 6 146m
A0 (6 1) (7 0) nlt_pq_4_10_lcpl_0
A1 (7 8) nlt_pq_4_10_mcore
A2 (9 3) (8 0) nlt_pq_4_10_lcpl_1
L1 9 10 1.11m
R1 10 4 500m
.MODEL nlt_pq_4_10_lcpl_0 lcouple(num_turns=1.622K)
.MODEL nlt_pq_4_10_mcore core(
+ H_array=[0 13.89 51.58 222.22]
+ B_array=[0 1 1.5 1.7]
+ area=130u length=76.15m
+ input_domain=10m fraction=TRUE mode=1)
.MODEL nlt_pq_4_10_lcpl_1 lcouple(num_turns=141)
.ENDS
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Old 20th July 2006, 03:32 PM   #3
classd4sure is offline classd4sure  Canada
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Ewwwwwwwb? I remember that NIGHTMARE!!!!

Thanks for the tips I'll look them up. I figure it would be handy to have as realistic a transformer model as possible. Alot of the variables will have to be guess work as I can't measure what I do have...
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Old 20th July 2006, 03:50 PM   #4
jackinnj is offline jackinnj  United States
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Power Transformer Spice Model
Quote:
Originally posted by classd4sure
Ewwwwwwwb? I remember that NIGHTMARE!!!!

Thanks for the tips I'll look them up. I figure it would be handy to have as realistic a transformer model as possible. Alot of the variables will have to be guess work as I can't measure what I do have...
EWB, please, it's a Canadian nightmare -- but under the wings of National Instruments it has gotten better. I think that NATI has a better way.
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