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
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
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
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
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...
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...
classd4sure said:
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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