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Hi Alex,
It doesn't matter where the diode is placed in the loop as it is the same current passing through all the components when in series. Only one diode is needed or four if full wave rectification is wanted. Your diode can withstand 16kV. Just stay below that voltage. If putting two diodes in series there's no guarantee that the reverse voltage across the two diodes will stay the same. Thus they'll have to be derated with regard to the reverse voltage across them. If one breaks down into an avalanche the other one gets the full voltage and thus will go into avalanche too making both diodes act like a short (solid state spark gap).
I have made electrets by heating PVC plastic then applied voltage across it and let it cool down. The voltage has to be applied until the dielectric is hardened. Else the charge dipoles won't stay locked in just one direction (along the electric field).
Regards
Ole
---In [email protected], <bugaian@...> wrote :
Hi Ole,
thanks for your suggestion. I have a couple of PRHVP-16 so do I connect one in series of +(positive) and one in series with -(negative) and then to electret? Is that what you mean or only one to +(positive) terminal is sufficient? I have seen last setup in some schematics.
Thanks.
Alex.
---In [email protected], <onielsen@...> wrote :
Hi Alex,
For making electrets a polarized voltage is needed. This requires a high voltage (HV) rectifier (diode) in series with the HV output terminals and the electret.
A spark gap just short out the voltage each time it ignites. This is not good for making an electret. Current only run during charging of the electret. After being charged only some small leak current may be running. Leak current isn't good in any capacitor or electret.
Regards
Ole
---In [email protected], <bugaian@...> wrote :
Hello to all in this new year.
I have followed this guide to build a flyback river:
http://kaizerpowerelectronics.dk/high-voltage/mazilli-zvs-flyback-driver/ http://kaizerpowerelectronics.dk/high-voltage/mazilli-zvs-flyback-driver/
It works quite well and spark is quite impressing, specially if you increase voltage more then 12V.
Now I want to move on using this for testing/creating electrets.
Question is for people with HV experience.
Should I have a spark-gap when I apply HV to terminals? I see that if I don't have a spark-gap circuit is not consuming DC current so I suppose its not quite working, so my position is to apply HV in paralel with a spark gap.
Please let me know of your experience with this.
Thanks.
Alex.