Duncan Amps PSU Designer II

rsumperl · 16th January 2011, 05:56 PM

Greetings everyone,
So, why is it, with a 440V secondary with a resistance of 31 ohms into a bridge, with just a 220U cap and the "standard" 5K load, do I get 473vdc and then if I uncheck soft start I get 584vdc.Which of these is correct?

Thanks,
Ray

Rod Coleman · 16th January 2011, 06:03 PM

584V is much nearer the real output.

To take account of the soft start, increase the simulation time to 10s, or even more, until the output remains flat.

Sheldon · 17th January 2011, 05:23 AM

Soft start adds about 1/2 second to the rise time. Total time to reach steady state depends capacitance and serial resistance. I don't think you'll need 10 seconds, but it won't hurt to try it, then you'll know how much you need to see the output.

Sheldon

16th January 2011, 05:56 PM	#1
rsumperl diyAudio Member Join Date: Oct 2009 Location: Binghamton, NY	Duncan Amps PSU Designer II Greetings everyone, So, why is it, with a 440V secondary with a resistance of 31 ohms into a bridge, with just a 220U cap and the "standard" 5K load, do I get 473vdc and then if I uncheck soft start I get 584vdc.Which of these is correct? Thanks, Ray

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16th January 2011, 06:03 PM	#2
Rod Coleman работник diyAudio Member Join Date: Jul 2004 Location: Warwickshire UK	584V is much nearer the real output. To take account of the soft start, increase the simulation time to 10s, or even more, until the output remains flat.

17th January 2011, 05:23 AM	#3
Sheldon diyAudio Member Join Date: Dec 2003 Location: San Diego	Soft start adds about 1/2 second to the rise time. Total time to reach steady state depends capacitance and serial resistance. I don't think you'll need 10 seconds, but it won't hurt to try it, then you'll know how much you need to see the output. Sheldon

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