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Forums
4hv.org :: Forums :: High Voltage
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50kV diode board

 1 2 3 
Move Thread LAN_403
Pinky's Brain
Thu Feb 23 2012, 04:02PM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Dr. Slack wrote ...

The general rule of thumb for putting non-avalanche rated diodes in series is to run them at 50% of nominal PIV to allow for this.
Really unless you're sitting on a pile of diodes you're itching to use there is no reason not to use avalanche rated diodes, BYV26 is dirt cheap.
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Inducktion
Thu Feb 23 2012, 05:41PM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
 		He has an arse load of SF4007's.... dunno why he doesn't use those since they're avalanche rated diodes...
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Fulmen
Thu Feb 23 2012, 09:10PM
Fulmen Registered Member #3883 Joined: Fri May 13 2011, 06:30PM
Location: Norway
Posts: 87
The Absurd wrote ...

Just solder a string of diodes, wind it around a smaller plastic tube and put the whole into a larger tube. Then pour some candle wax or resin over it.

Winding them around a tube without isolation would increase the differential potential between two adjacent diodes (greater risk of flash-overs etc). I made a similar arrangement to gren's by soldering parallel diodes directly to each other with heat-shrink around it, making it quite compact and sturdy. Has run for quite some time at appr 2/3 load without fail (37 4007's @ 20KV+, rectifying an ignition coil).

I agree with Dr. Slack's assessment that you cannot run such creations at 100% theoretical load, that could easily lead to a cascade failure.

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Dr. Slack
Thu Feb 23 2012, 10:52PM
Dr. Slack Registered Member #72 Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Pinky's Brain wrote ...


... BYV26 is dirt cheap.

in 100s, from Farnell(UK), the same price as UF4007s, but make sure you get the -E suffix, -A to -D are 200v to 800v respectively. In contrast, 1N4007s are 1/4 the price of those, but they're not really fast enough to handle an ignition coil, 50/60Hz is all they're good for.
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Adam Munich
Fri Feb 24 2012, 04:32AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
 		Yes quack I do have a bunch of sf4007's but seeing how they aren't made anymore and are expensive, I'd like to save them for special occasions. A 50kV ultrafast diode wouldn't be all that useful anyway. 20kV possibly, but 50kV not so much.

As for the diode cascade failure, I haven't had much of a problem with strings of 1n4007's. Sure a 50kV diode would be used in a 40kV circuit, but diodes from the same order are often matched enough that when used at 60hz, they'll all switch at about the same time.
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ZakWolf
Fri Feb 24 2012, 04:32AM
ZakWolf Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
 		Would this work as a full bridge?

With more diodes for desired output.
1330057970 3114 FT134673 Bridge Rectifier
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Adam Munich
Fri Feb 24 2012, 04:42AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
 		It would, but it's a pretty poor design since the HV leads are right next to each other. A diamond shape would make more sense.

If anyone would like me to, I could cut them some of these diode 'pcbs'...
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ZakWolf
Fri Feb 24 2012, 05:08AM
ZakWolf Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
 		how about this?
1330060076 3114 FT134673 Bridge 2
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Dr. Slack
Fri Feb 24 2012, 07:59AM
Dr. Slack Registered Member #72 Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
 		Which bit of "diamond" didn't you get, now the input AC HV leads are close to each other.

Try

+
     /   \
    /     \
   /       \
  /         \
ac          ac
  \         /
   \       /
    \     /
     \   /
       -
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ZakWolf
Fri Feb 24 2012, 08:18AM
ZakWolf Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
 		[quote]
Which bit of "diamond" didn't you get, now the input AC HV leads are close to each other.

Try

+
     /   \
    /     \
   /       \
  /         \
ac          ac
  \         /
   \       /
    \     /
     \   /
       -
[/quote1330071316]

I got it, i know what a bridge rectifier looks like.

I was just trying to save space, having them in a row would be easier to make because all you need is a square.

Also you can turn the last and first diodes to connect together.
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