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Old 11th April 2013, 12:09 AM   #1
alecu7 is offline alecu7  Canada
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Default PSU II Question

I'm a little puzzled about some of the results from PSU program.
For I1 I have 100mA stepped to 170mA (after 3 seconds). In the same way I have I2 4mA stepped into 8mA after 4 seconds.
When I ran the results after 20 seconds I see I1 = 100mA and I2 = 8mA. I don't think I1 should be 100mA but 170mA (especially after 20 seconds). To me the final currents should be 170mA and 8mA.
The current through the choke is 178mA (which is correct).

Am I doing something wrong here?

Second picture shows the transient time at the beginning of the simulation.

Thank you,
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File Type: jpg Psu 1.jpg (184.0 KB, 179 views)
File Type: jpg Psu 2.jpg (200.6 KB, 169 views)
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Old 11th April 2013, 11:03 PM   #2
alecu7 is offline alecu7  Canada
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I'm wondering if anybody got an explanation for this issue!
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Old 12th April 2013, 01:42 AM   #3
jjman is offline jjman  United States
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I ran your numbers and see the same thing. The voltage drops on c2 and I1 as it should at 20 seconds. Moving the step forward or back does not resolve it. Looks to be a bug. I have ver 2.0.2.
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Old 12th April 2013, 02:30 AM   #4
alecu7 is offline alecu7  Canada
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Thank you for confirming it. I have run hundred of simulations and I always get the same result. At least I'm not crazy.
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Old 12th April 2013, 07:59 PM   #5
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Default PSUDII and Current taps

I tried out this simulation and got the same results as everyone else ( no surprise there)
I fooled around a bit with adding more current taps and changing the timing etc and it looks like the only current tap that gets the correct current to plot is the one used as the final load. Any other position it behaves as L1 does in the original post. The simulations seem to be correct ie they draw the second requested current, just reporting the first one the plot.

I don't see a place to provide feed back on the DuncanAmps web page, or anything in the PSUDII help file, otherwise I would report this as a bug.
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Old 13th April 2013, 12:13 PM   #6
alecu7 is offline alecu7  Canada
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I'm also using version 2.0.2 built 41.
I have emailed Duncan about the issues we are having and we just have to wait for an answer now.

Thank you all for confirming the bug. It is nevertheless one of my favorite programs that I'm using.

alecu7
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Old 13th April 2013, 03:17 PM   #7
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Hi all, it sounds like something in PSUD2 that should have been implemented and wasn't.

Don't have time to look at it this weekend because of family commitments but I will have a look on Monday night.

Regards,
Duncan
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Old 13th April 2013, 09:15 PM   #8
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Welcome to the forum Duncan, great freebee
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Old 14th April 2013, 01:22 AM   #9
surfstu is offline surfstu  United Kingdom
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Yes, thankyou Duncan, I aprreciated using this bit of software too!!
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Old 14th April 2013, 02:16 PM   #10
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Thanks Duncan! I find PSUDII to be incredibly useful as well.
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