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In Reply to: RE: UTC output transformers LS-63 posted by dave slagle on April 15, 2015 at 20:18:12
OK... here is the transient behavior for the loadlines above...
as expected, the lightest load shows the most gain and interestingly enough, it also has the lowest distortion. Now for the FFT...
I'm not sure why we have a color shift between the 5K and 16K in the FFT but here are the data points..
Direct Newton iteration for .op point succeeded.
Fourier components of V(out_16k)
DC component:0.000594292
Harmonic Normalized
Number Component
1 1.000e+00
2 1.100e-02
3 1.283e-03
4 1.987e-04
5 3.711e-05
6 6.282e-06
7 2.107e-06
8 3.145e-07
9 6.095e-07
Total Harmonic Distortion: 1.107250%
Fourier components of V(out_5k)
DC component:0.000168459
Harmonic Normalized
Number Component
1 1.000e+00
2 4.851e-02
3 1.028e-02
4 3.092e-03
5 1.113e-03
6 4.449e-04
7 1.920e-04
8 8.767e-05
9 4.107e-05
Total Harmonic Distortion: 4.970236%
Fourier components of V(out_1meg)
DC component:0.0011142
Harmonic Normalized
Number Component
1 1.000e+00
2 3.483e-03
3 2.584e-04
4 2.581e-05
5 4.752e-06
6 5.223e-07
7 7.718e-07
8 6.762e-07
9 5.302e-07
Total Harmonic Distortion: 0.349257%
Date: Wed Apr 15 23:30:12 2015
Total elapsed time: 13.688 seconds.
Follow Ups:
to keep things in perspective here is the FFT lowering the input on the 16K and 1 meg versions to normalize the fundamental.
finally, dropping the frequency down to 25hz nets the following distortions...
Circuit: * C:\Documents and Settings\Administrator\Desktop\LTspice\distortion 211.asc
Direct Newton iteration for .op point succeeded.
Fourier components of V(out_16k)
DC component:0.00186278
Harmonic Normalized
Number Component
1 1.000e+00
2 3.012e-02
3 4.780e-03
4 1.021e-03
5 2.522e-04
6 6.747e-05
7 1.962e-05
8 5.763e-06
9 1.720e-06
Total Harmonic Distortion: 3.051666%
Fourier components of V(out_5k)
DC component:0.00130548
Harmonic Normalized
Number Component
1 1.000e+00
2 7.082e-02
3 1.922e-02
4 7.692e-03
5 3.789e-03
6 2.130e-03
7 1.315e-03
8 8.702e-04
9 6.071e-04
Total Harmonic Distortion: 7.392847%
Fourier components of V(out_1meg)
DC component:0.00186514
Harmonic Normalized
Number Component
1 1.000e+00
2 2.851e-02
3 4.465e-03
4 9.272e-04
5 2.188e-04
6 5.791e-05
7 1.497e-05
8 4.934e-06
9 1.482e-06
Total Harmonic Distortion: 2.887076%
Date: Wed Apr 15 23:59:57 2015
Total elapsed time: 3.969 seconds.
tnom = 27
temp = 27
method = modified trap
totiter = 109323
traniter = 109319
tranpoints = 25692
accept = 19265
rejected = 6427
trancuriters = 0
matrix size = 33
fillins = 6
solver = Normal
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