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4hv.org :: Forums :: High Voltage
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Better HV Transformer for 10KV at 10ma

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corona
Tue Sept 15 2009, 09:32AM Print
corona Registered Member #2365 Joined: Tue Sept 15 2009, 05:30AM
Location:
Posts: 2
Neon sign transformer, Ignition Coil, or Flyback transformer? This would be powered at 120hz maximum. This is to power a nitrogen laser.
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Proud Mary
Tue Sept 15 2009, 10:37AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I just bought a couple of 4kV-0-4kV boiler ignition transformers for about US $20 the pair. That's 11kV peak, so great for an X-ray PSU with a few C&W stages after it, if you've got a handful of suitably fat capacitors.
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lpfthings
Tue Sept 15 2009, 11:57AM
lpfthings Registered Member #1361 Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
Since you need to charge capacitors, I would say a modern DC flyback. 10kV isn't pushing them, I think 10ma is reasonable ...
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corona
Thu Sept 17 2009, 03:34AM
corona Registered Member #2365 Joined: Tue Sept 15 2009, 05:30AM
Location:
Posts: 2
Thanks for the replies! I just harvested an LOPT/flyback transformer from an RCA television. It's rated for 26.9KV. I'm not sure which circuit I'll use with it to power my nitrogen laser.
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Dr. Dark Current
Thu Sept 17 2009, 07:54AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I'd use a variable duty cycle chip (such as the SG3525) to vary power, and my improved single-switch output stage, driving a rectified TV transformer.

1253173966 152 FT75984 Qr V4 En
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