Spellman -40kV PTV power supply

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Richard Hull
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Re: Spellman -40kV PTV power supply

Post by Richard Hull »

Very, very nice work Andrew. This shows "where there is a will, there is a way"! Onward and upward.

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Re: Spellman -40kV PTV power supply

Post by Andrew Seltzman »

Annotated schematic with modifications:
spellman-annotated-schematic.pdf
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Re: Spellman -40kV PTV power supply

Post by Andrew Seltzman »

As advised by Cliff, I have added a blower to keep the HV transformer secondary cool. It is a 12v blower and is fairly high performance generating significant airflow over the winding. The power supply is designed for a 24v fan so a DC-DC converter is used to convert the voltage to 12v.

12v DC blower
SAM_4446a.jpg
Standoff added to power supply
SAM_4447a.jpg
12v DC blower mounted on standoff and aimed over transformer winding, DC buck converter converts 30V from supply to 12V for the fan
SAM_4448a.jpg
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Re: Spellman -40kV PTV power supply

Post by Andrew Seltzman »

Drawing power from the 24V port was found to cause a voltage spike of shutdown(even though this is where fan power was supposed to come from). Instead an AC-DC power brick was connected to the internal corecom inlet filter to supply power to the fan, solving the HV spike problem
SAM_4506a.jpg
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Re: Spellman -40kV PTV power supply

Post by Garrett Young »

Another question for Cliff ...

Is there any headroom on the voltage multiplier section? Can the PTV30N be run at 31 or 32 output kV with feedback modification?
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Re: Spellman -40kV PTV power supply

Post by mircado »

Hello
I have a spellman high voltage power supply have a burnt transformer T3.
What is the solution and what id the reason
Best Regards
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Dennis P Brown
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Re: Spellman -40kV PTV power supply

Post by Dennis P Brown »

First, great post and work, Andrew!

Poster mircado - first, you need to fix your name, we use full names in all sections (yes, nick names are used by people in day-to-day activities but policy here we use full names). Second, using someone else's post to ask your own question is not the proper method (I understand the reason.) Rather, start your own post or send a PM to the poster.

Thanks and good luck with your efforts.
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Re: Spellman -40kV PTV power supply

Post by Andrew Seltzman »

My best guess is to try to find a similar surplus secondary and try to replace the burnt one, it would be pretty difficult to wind your own (though not impossible).
Also you posted about this in this thread in 2015, is this the same supply?
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Re: Spellman -40kV PTV power supply

Post by mircado »

Thank you for your reply.
Yes it is the same, i change the complete unit before.
Now it is very difficult to change it again so i am searching for another solution
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