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 » Tue Sep 08, 2015 7:04 pm

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 » Tue Sep 08, 2015 11:53 pm

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

Post by Andrew Seltzman » Sat Oct 03, 2015 7:05 am

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 » Mon Nov 09, 2015 1:35 am

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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Garrett Young
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Re: Spellman -40kV PTV power supply

Post by Garrett Young » Wed Apr 05, 2017 6:47 pm

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?
- Garrett
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