HV diodes
in [Design]
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From: Joerg on 24 Apr 2010 18:31 Jim Thompson wrote: > On Sat, 24 Apr 2010 13:37:56 -0700, Joerg <invalid(a)invalid.invalid> > wrote: > >> TTman wrote: >>> 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 >>> >> A bunch of these in series? >> >> http://www.vishay.com/docs/88546/bym1050.pdf >> >> No where to find them, that's another story. And don't forget parallel >> resistors to equalize the reverse voltages, else ... phut ... *POOF* > > http://www.surplussales.com/semiconductors/Diodes-1.html > > http://www.voltagemultipliers.com/Aliases/LPs/High-Voltage-Rectifiers.html?gclid=CIynnK2boKECFQdkgwod2xemvw > > http://www.nteinc.com/Web_pgs/hvr.html > > http://www.kronjaeger.com/hv/hv/comp/rect/index.html > Remember, he wanted SMT :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 24 Apr 2010 18:37 John Larkin wrote: > On Sat, 24 Apr 2010 13:37:56 -0700, Joerg <invalid(a)invalid.invalid> > wrote: > >> TTman wrote: >>> 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 >>> >> A bunch of these in series? >> >> http://www.vishay.com/docs/88546/bym1050.pdf >> >> No where to find them, that's another story. And don't forget parallel >> resistors to equalize the reverse voltages, else ... phut ... *POOF* > > 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. > 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. > At higher frequencies, the reverse voltage distribution is determined > by diode capacitance and reverse recovery behavior, and resistors > won't have much effect. > 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. > We sometimes use step-recovery diodes in series to make high-voltage > pulses. That should certainly have problems, but it works fine. > Sounds like a white-knuckle ride :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Archimedes' Lever on 27 Apr 2010 06:37 On Thu, 22 Apr 2010 17:21:06 +0100, "TTman" <someone.pc(a)ntlworld.com> wrote: >> >> 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.... 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.
From: Archimedes' Lever on 27 Apr 2010 07:16 On Sat, 24 Apr 2010 13:53:48 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >On Sat, 24 Apr 2010 13:37:56 -0700, Joerg <invalid(a)invalid.invalid> >wrote: > >>TTman wrote: >>> 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 >>> >> >>A bunch of these in series? >> >>http://www.vishay.com/docs/88546/bym1050.pdf >> >>No where to find them, that's another story. And don't forget parallel >>resistors to equalize the reverse voltages, else ... phut ... *POOF* > >http://www.surplussales.com/semiconductors/Diodes-1.html > >http://www.voltagemultipliers.com/Aliases/LPs/High-Voltage-Rectifiers.html?gclid=CIynnK2boKECFQdkgwod2xemvw > >http://www.nteinc.com/Web_pgs/hvr.html > >http://www.kronjaeger.com/hv/hv/comp/rect/index.html > > ...Jim Thompson Philips, idiots... Philips. http://www.voltagemultipliers.com/CrossReferencedDiodesPhilips/PhilipsCrossRef.htm
From: Archimedes' Lever on 27 Apr 2010 07:27
On Sat, 24 Apr 2010 15:31:21 -0700, Joerg <invalid(a)invalid.invalid> wrote: >Regards, Joerg > snipped retarded, self aggrandizing link > >"gmail" domain blocked because of excessive spam. >Use another domain or send PM. Yet another utter retard that cannot read ALL the news. You deserve no "PM". |