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Forums
4hv.org :: Forums :: High Voltage
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CW multiplier diodes

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Dr. ISOTOP
Wed Feb 16 2011, 05:46AM Print
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
 		I'm looking to build a CW multiplier similar to Steve Ward's. Will appropriate numbers of UF4007 diodes work? They are fast enough, but not avalanche rated.
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uzzors2k
Wed Feb 16 2011, 08:57AM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
 		I've used UF4007s in a small 20kV mulitplier, and haven't had any problems. Just make sure you use twice as many as required for the input voltage, and then add 50% more for good overhead. Link2 You can find avalanche rated diodes in bulk on ebay, for pennies.
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Dr. ISOTOP
Wed Feb 16 2011, 09:05AM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
 		What's a good avalanche diode to use? The UF4007's I found are $0.08 in bulk on Ebay; are there any avalanche diodes for a similar price?
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uzzors2k
Wed Feb 16 2011, 10:27AM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
 		I used RGP10M diodes my first multiplier, they're available at 20 cents each.
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Pinky's Brain
Wed Feb 16 2011, 06:20PM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
bwang wrote ...

What's a good avalanche diode to use? The UF4007's I found are $0.08 in bulk on Ebay; are there any avalanche diodes for a similar price?
1n5062 are the cheapest avalanche rated diodes I could find in this voltage range (it's 800 Volt).

Digikey doesn't have them in small amounts, but for instance TME does ... 6 eurocent a piece for 100+.
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Sulaiman
Wed Feb 16 2011, 06:51PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
 		AFAIK a C-W multiplier does not need avalanche rated diodes
the recovery times should be suitable for the 'pumping' frequency
e.g. 1N4007 for 50/60 Hz, UF4007 for 20 kHz etc....
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jpsmith123
Thu Feb 17 2011, 05:14AM
jpsmith123 Registered Member #1321 Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
 		What I want to know is: Is HVCA the only primary source for HV (i.e., over 1 kv), fast recovery diodes that there is?
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Sulaiman
Thu Feb 17 2011, 06:25AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
 		Most of my HV diodes are from China via eBay.
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Patrick
Thu Feb 17 2011, 06:26AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		UF4007, 75nS ... whats the max freq you would suggest Sulaiman, for a full wave, square-wave driven CW?

I use the HER 108's which are 1kV, 1amp, 75nS.
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jpsmith123
Thu Feb 17 2011, 07:05AM
jpsmith123 Registered Member #1321 Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
 		If it's the seller I'm thinking about, I think he sells HVCA parts too - or they sell his parts. Either way, it seems there's only one primary source.

I have some 2CL2FM (20 kv) diodes that I was going to use in a multiplier, but I now think I'd be better off using a string of 4, 5 kv diodes. This way, there'd be a longer creep path and the power dissipation would be spread out over 4 different devices; and, depending on the diodes, I should be able to operate at a higher current as well.

I'd like to use BR5F diodes (by HVCA of course, since I can find no other manufacturer), but I can't find a distrubutor that has them and I don't see them on ebay unfortunately.

Sulaiman wrote ...

Most of my HV diodes are from China via eBay.
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