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It could certainly be changed, the issue is that it doesn't have an ability to have two different PIV in the model. The PIV parameter doesn't actually do anything other than to issue a warning to tell you that the number has been exceeded. If the warning is a nuisance, it can be turned off with the Options > Allow Warnings menu item.

Regards,
Duncan

it is not a matter of annoyance in seeing the message, but I would like to be sure that the valve does not blow.

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On 2/10/2021 4:44 PM, SB-LAB di Bianchini Stefano wrote:

be sure that the valve does not blow.

If your VAC is under 654V AC for inductive input, and your input choke is reasonably large (Google "critical choke value"), then the PIV will be under 1850V. (565V AC for the 1600V condition and rating.)

These values give 588V or 790V of DC, which for most purposes is "a lot!". Some radio transmitters run higher, most audio much lower. (Yes, I have worked in a 590V Ampeg amplifier, and I lived.)

PSUD is very very wonderful but not perfect. If you force it into unhappy conditions it sometimes gives wrong answers. I knew that 442VAC would not normally cause more than 1250PIV. However when PSUD is given a too-small choke value, when the current passes through zero the choke "kicks". How much does it kick? PSUD can not know, we have not told it the shunt resistance and capacitance of the choke. So PSUD gets a "divide by Zero" error and throws out some large numbers. Like 2206V! And lotes of very narrow "static" spikes. An under-sized choke is *bad*, but does not look like this.

I was not able to get an extreme PIV when I checked the Choke Current to see that it never got close to zero, the test for "critical inductance".

-Paul

On Wed, Feb 10, 2021 at 02:12 PM, SB-LAB di Bianchini Stefano wrote:

it is not a matter of annoyance in seeing the message, but I would like to be sure that the valve does not blow.

OK, I understand now. You can amend the PIV on the rectifier to suit this need. The help file gives some guidance on making up your own rectifiers and modifying the existing ones.

Help > Contents > Technical information > How to add your own rectifier types

You might want to take the gz37.rect file and copy to something like gz37ind.rect to make an inductive version with higher PIV. Notepad can be used to open and change the file. As well as changing the <vpiv> value you will need to change the <name> value also, as it will not want to load the same name twice, so the contents of the file should end up looking like:

Regards,
Duncan