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PSUD (Power Supply Unit Designer)
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Old 8th October 2019, 01:22 AM   #101
RickRay is offline RickRay  United States
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PSUD (Power Supply Unit Designer)
Thank you so much for this EXTREMELY useful tool!!!!
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Old 8th October 2019, 02:33 AM   #102
kodabmx is offline kodabmx  Canada
Spreading triode love.
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PSUD (Power Supply Unit Designer)
+1 although I've never had real world circuits that match what PSUD2 said it would do...
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Old 1st March 2020, 06:27 PM   #103
musicpre is offline musicpre  United States
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Even while the third version is in the works, thank you very much for releasing the MacOS version of PSUD2 in February 2020. The only serious issue so far that I have encountered with the MacOS version of PSUD2 is how to insert new filter sections.
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Old 21st April 2020, 03:43 AM   #104
DSP_Geek is offline DSP_Geek  Canada
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PSUD is not only good for hollow-state, it's also nice for sand-state. I've run a bunch of sims and soldering up hardware shows voltages & ripples are pretty well on the money. Sweet!

If anyone runs across this sort of output, here from a lightly loaded choke input filter with a 400 ohm load resistor emulating about 50-60 mA from the supply, Duncan's already on the case.

PSUD_output.png

From the Help menu:
Quote:
Q: Why are there sometimes small glitches on the rectifier voltage?
A: These are caused by short cuts taken in the simulation. A dramatic speed improvement is made over alternative simulators such as SPICE, and this is the price that is paid for the extra speed.
And the fix, from Help->Technical Information->Program Limitations:
Quote:
Choke input filters
Choke input filters are now catered for, however the model is fairly simplistic. Should the current collapse to zero in the choke, then high voltage spikes will appear at the cathode of the rectifier. In a real world scenario, these would be partly soaked up by the reverse capacitance of the rectifier. As rectifier capacitance is not modelled, a reverse leak facility helps tame this effect.
For this circuit, setting 10k in Options->Rectifier Leak sorted the funky output nicely. Firebottle choke input filters could be happy with higher values.

Last edited by DSP_Geek; 21st April 2020 at 03:47 AM.
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Old 26th December 2020, 06:48 AM   #105
SanjeevM is offline SanjeevM
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Default Ripple Voltage

How can I see the voltage of the ripple current in the DC output ?
(Newbie to PSUD2)
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Old 26th December 2020, 10:01 AM   #106
trobbins is offline trobbins  Australia
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Press Simulate button, using something like : for 300ms after 5 secs delay.
And click the parameter for the voltage across your load.
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Old 26th December 2020, 10:57 AM   #107
SanjeevM is offline SanjeevM
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Default Ripple Voltage

Thanks !
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Old 26th December 2020, 11:02 AM   #108
SanjeevM is offline SanjeevM
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If I am designing for a steady current of 2A at 24VDC across an amplifier load in a CRC filter, the load resistance (R2) I should use should be 12 ohms, for simulation. Will this give correct results ?
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Old 26th December 2020, 12:35 PM   #109
trobbins is offline trobbins  Australia
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Certainly make R2=12.
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Old 26th December 2020, 03:15 PM   #110
DSP_Geek is offline DSP_Geek  Canada
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Quote:
Originally Posted by SanjeevM View Post
If I am designing for a steady current of 2A at 24VDC across an amplifier load in a CRC filter, the load resistance (R2) I should use should be 12 ohms, for simulation. Will this give correct results ?
It will. Since the current will be steady at 2A, have you considered an inductor before the first capacitor to make the filter LCRC? The right inductor will knock down ripple voltage to about a tenth of a CRC section's, and thus power by about 20 dB (power is proportional to voltage squared), with what's left having almost no content above twice line frequency. You only have to make sure the initial power-on doesn't have excessive voltage overshoot; less than 10% is usually acceptable. Using an inductor will also reduce the supply output voltage since LC sections tend to average the input rather than ride the peaks, so selecting a higher voltage for the transformer secondary will solve that problem.

Happy simulating!

Last edited by DSP_Geek; 26th December 2020 at 03:17 PM.
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