Bob Boyce TPU thread

[Rich SAS]

I have another fairchild part you may want to look at, as far as high speed diodes go. P/N is: FFPF08S60 . Called stealth II Rectifier.

Rich

[eldarion]

I have invested in several MBR1090 SiC 90V Schottky diodes, which I will be trying on the secondary as soon as my system is operational.

Obviously I will be careful to load the secondary so as not to exceed the voltage rating of several of these devices in series...

Eldarion

[HumblePie]

Might be worth looking into these. They may be fast enough to use for energy conversion.

http://www.fairchildsemi.com/pf/RH/RHRD660S.html

Bob

Edit - @Anyone,

Please elaborate on the ultra fast diodes that may be used in the Secondary configuration. Edit - Thx Earl.  I see now it is a matter of being able to switch fast enough and being high voltage tolerent for isolating HV PS.  Just hooked up 22M resistance and will report back soon on how this works.  I'll try lamp on other side of Secondary too to maybe indicate if energy is still going into HVPS path or not.

@Bob,

I read about use of Germanium devices operating as LMD detector (or it it LEM). I wish to try this for avananche detection alternative to watching just Pancake DC.  Is one of these evalanch detection means preferable over the other?I am very glad to see RichSAS's input in Eld's thread showing Cap' isolated Battery Bank HV PS.

http://www.overunity.com/index.php/topic,2872.msg58519.html#msg58519

(Thank you Rich.)  It seems batteries also convert LEM to TEM.  Thank you all for fantasitic input and the effort spent sharing this.  It is much appreciated. 

Ward

[Earl]

I have invested in several MBR1090 SiC 90V Schottky diodes, which I will be trying on the secondary as soon as my system is operational.

Obviously I will be careful to load the secondary so as not to exceed the voltage rating of several of these devices in series...
Eldarion

Be careful about series-connected diodes; there is no guarantee that reverse leakage currents will be equal. It is very prudent to put an equalizing resistor across each diode, if using more than one.  100k might be a good value to think about; calculate power disapation if using a chip resistor.

At 50/60 Hz, radio hams use 100k and .001 or .01 uF ceramics in parallel across each series diode in their HV supplies, but at high freqs, the caps would have to be greatly reduced in value or eliminated.

Earl

[MarkSnoswell]

@Bob

It's rather quiet in here. How is your build going? ... it would be great to get more data and photographs of your work for everyone to follow.

mark.