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4hv.org :: Forums :: General Science and Electronics
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high voltage transformer without primary

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Duality
Thu Oct 07 2010, 07:49PM Print
Duality Registered Member #1951 Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
sorry for this simple question, but what's a high voltage tranformer without a primary called?
i have seen some, if i know the name i can google on cheesey:)
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Dr. Dark Current
Thu Oct 07 2010, 08:33PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I would call that a high voltage choke. tongue
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radiotech
Thu Oct 07 2010, 10:54PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Try googling the concept of inductive stepup. An inductor of 1 henry with a current of 1 amp flowing through it will have a voltage drop of 6.28 million volts at 1 mHz.

Just hook it in series with 25.6 femtoFarads and feed the series combination with as few volts.
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Patrick
Thu Oct 07 2010, 11:04PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
radiotech wrote ...

.... voltage drop of 6.28 million volts at 1 mHz.
do you mean 1MHz, Mega- or Milli- ?
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cedric
Fri Oct 08 2010, 11:40AM
cedric Registered Member #2941 Joined: Fri Jun 25 2010, 08:08AM
Location:
Posts: 143
an autotransformer? or a ballast use in starting mode ?
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Proud Mary
Fri Oct 08 2010, 11:44AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
In the case of a resonant voltage doubler, as per thyratron power supply, I would call it a charging choke.
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radiotech
Fri Oct 08 2010, 09:38PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Patrick wrote:" .... voltage drop of 6.28 million volts at 1 mHz.
do you mean 1MHz, Mega- or Milli- ?

Mega ie 1e6 Hz

Can you envision 6.28 million volts across 25.6 FemptoFarads ?
or 2* pi * Megavolts.
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HazzWold 1993
Sun Oct 10 2010, 04:53AM
HazzWold 1993 Registered Member #2563 Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280
Could you call a magneto (Like from a lawnmower, or old engines) a Hv xformer without a primary? it only makes a high voltage spark for the ignition of the fuel but theres no primary, it just has a magnet run past it.
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