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4hv.org :: Forums :: High Voltage
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Do you know any good HV diodes that perfrom well at upper KHz - lower MHz rf frequencies?

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tarakan2
Wed Aug 20 2014, 06:58AM Print
tarakan2 Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
Do you know any good High Voltage diodes that perfrom well at upper KHz - lower MHz rf frequencies?

I am planning on building a high voltage rectifier for an experiment.

I am going to use voltages of 1KV 2KV or 10KV - those numbers resemble common diode price brackets.

I know understand that my question is a little naiive.
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Steve Conner
Wed Aug 20 2014, 08:47AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Sounds like a job for silicon carbide Schottkies.
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Dragon64
Wed Aug 20 2014, 05:28PM
Dragon64 Registered Member #1438 Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218
Steve Conner wrote ...

Sounds like a job for silicon carbide Schottkies.

You'll probably need to hook them in series as most schottky are 1200V and lower.
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Ash Small
Wed Aug 20 2014, 06:44PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
They have some 20kV, 25mA, 100nS reverse recovery ones here. How fast do you need?

Link2

They have faster, lower voltage diodes too, ie: 15kV, 100mA, 30nS reverse recovery.

Don't expect E-bay prices, though wink
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teravolt
Wed Aug 20 2014, 10:16PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
what type of high voltage are you rectifying flyback, tube output, etc. maybe they don't have to be so fast.
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tarakan2
Thu Aug 21 2014, 05:57AM
tarakan2 Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
I am experimenting with an Avramenko Fork.
AvramenkosFork

Except I am using HV power supplies. This is a real, working circuit and it is interesting.

Link2
Sorry, I will make an English translation of this video soon.
I am a little busy at work.
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Steve Conner
Thu Aug 21 2014, 06:58AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
This is just the same sort of "one wire" power transmission that Tesla experimented with. The circuit is completed by stray capacitance between the load and ground. (Draw a capacitor from each end of the load to ground, draw in the ground connection of the signal generator, and you have a full-wave doubler.)

If you want to build it cheaply, the EHT rectifier tubes used in old tube TV sets (with batteries for the heaters) would be ideal. Vacuum tubes have no reverse recovery charge, they will rectify almost as fast as you like. Maybe someone else can suggest some part numbers. Watch out for X-rays.
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Ash Small
Thu Aug 21 2014, 10:19AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Link2

Here's one. Can't seem to find a datasheet for it, though.

Here's the datasheet for a common one, the KY50 (U25):
]u25.pdf[/file]

Another is the KY80 (U26): Link2
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Patrick
Thu Aug 21 2014, 09:39PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
we always see the 30nS and 100nS time intervals quoted in datasheets and we always see 60Hz and 120Hz numbers for common(standard) rectifiers for line use. But maybe we here at the 4HV should figure out how rate of rise correlates to a diode spec requirement.

HV waves tend to not reverse instantly, so what nano-second revesrse recovery is needed for heat and not popping with smoke? This way we dont have to buy excessivly spec'ed and cost componets.

is there a way to experiment or calculate this? obviously, when seriesed, it gets more complicated.


This was the purpose for my HV O-scope Probes and the years of work they took to get right.

I was/am most interested first, in square wave HV from SMPS (high power ferrite) transformers being rectified. And second, feeding CW type multipliers. so diodes become important.

(i do like the HER108, but its 1kv only.)



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Ash Small
Fri Aug 22 2014, 12:03AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Patrick wrote ...

we always see the 30nS and 100nS time intervals quoted in datasheets and we always see 60Hz and 120Hz numbers for common(standard) rectifiers for line use. But maybe we here at the 4HV should figure out how rate of rise correlates to a diode spec requirement.

HV waves tend to not reverse instantly, so what nano-second revesrse recovery is needed for heat and not popping with smoke? This way we dont have to buy excessivly spec'ed and cost componets.

is there a way to experiment or calculate this? obviously, when seriesed, it gets more complicated.


This was the purpose for my HV O-scope Probes and the years of work they took to get right.

I was/am most interested first, in square wave HV from SMPS (high power ferrite) transformers being rectified. And second, feeding CW type multipliers. so diodes become important.

(i do like the HER108, but its 1kv only.)






I concurr. If you have inductance, you have time before current reverses. wink
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