Anyone know of a s/mount alternative for HV03-10 ? The circuit has 2 in series+ 2 in parallel. I could use more in series to get to 10KV rating/400mA TIA
- posted
13 years ago
Anyone know of a s/mount alternative for HV03-10 ? The circuit has 2 in series+ 2 in parallel. I could use more in series to get to 10KV rating/400mA TIA
TTman schrieb:
Hello,
if you connect several diodes in series and parallel, you have to take care for an equal distribution of the voltage over the diodes in series and the current over the diodes in parallel. Parallel and serial resistors may help.
Bye
That would be a lot of power dissipation for a surface-mount part. Most HV rectifiers have a lot of junctions in series == lots of forward drop == lots of power dissipation at 400 mA.
John
Yes..... VF is quoted at 10V....
A bunch of these in series?
No where to find them, that's another story. And don't forget parallel resistors to equalize the reverse voltages, else ... phut ... *POOF*
-- Regards, Joerg http://www.analogconsultants.com/
-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et |
Modern controlled-avalanche rectifiers don't need equalizers for series operation; they don't have a hard negative-resistance behavior. Schottkies certainly don't; they just leak more as voltage goes up so tend to equalize on their own.
At higher frequencies, the reverse voltage distribution is determined by diode capacitance and reverse recovery behavior, and resistors won't have much effect.
We sometimes use step-recovery diodes in series to make high-voltage pulses. That should certainly have problems, but it works fine.
John
Remember, he wanted SMT :-)
-- Regards, Joerg http://www.analogconsultants.com/
AFAIR the BYM series has been around for a while so they might not be that modern. With diodes back in the 80's you really needed those resistors. I remember a guy who didn't believe me and in due course lost a pretty expensive plate transformer.
If it's 60Hz stuff it's good practice to use small caps in parallel as well. Cuts down on modulating strong carriers and spewing them back out into the world, but this time with AM-hum on there.
Sounds like a white-knuckle ride :-)
-- Regards, Joerg http://www.analogconsultants.com/
It is very easy to find out how many elements are in the stack for an HV diode.
It is 0.15 Volts per element. If the diode drops 10 Volts, it has like
65 series elements in it.Power dissipation? No. Sorry idiot.
Philips, idiots... Philips.
snipped retarded, self aggrandizing link
Yet another utter retard that cannot read ALL the news.
You deserve no "PM".
HV silicon diodes drop around 0.7 volts each, not 0.15.
Sorry, idiot. You are AlwaysWrong.
John
I said surface mount...... idiot
Too stupid to recognize facetious calls ME an "idiot" ?:-)
It actually would be fun to stand by while he "fires" up his poor excuse for engineering :-) ...Jim Thompson
-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et |
A calmer mind that can simply ignore dorks like you.
You are the weakest link... goodbye.
I don't think you design electronics at all.
John
Err...
FAIL!
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
You're leaving, DimBulb? Great! Bye.
SDB
I am sure that the acronym will evade your grasp, but it is you that fails. My shit works. Keeps our boys safe. Fuck off, both of you.
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