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Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
Hi everyone. I am building my first drsstc and I have a few questions about the power supply I plan on using for the bridge. I've googled around at various half wave and full wave doublers and searched in the forums here as well. I have also seen some photos of other people's setups which make use of mains input from a variac (no isolation) wired to a bridge rectifier to one or two large electrolytic capacitors in order to make a doubler. I like the idea of this since I've seen a few well built drsstc's successfully powered this way. I might be totally overlooking something but I cant seem to find any schematics online that show exactly this, so I drew up my own diagram:
the bridge rectifier I have available for B is a 1200V 35A bridge rectifier, I think I also have a 400V 25A one around somewhere but I think either would work fine.. C1 and C2 are both large 12000uF 200V CDE's, a bit big but again it's what I have available again the power input is roughly 120-130VAC from variac. I plan on putting a fuse between the HOT and the rectifier even though I left it out of the drawing.
So my questions are: would this work just fine? would using a bridge rectifier like this protect against reverse voltage? any pros/cons of using this kind of doubler?
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
I use that same method in my big DRSSTC and has never failed me, only using a 30A bridge with two didoes inside that brings it to almost 60A. However I have pushed that doubler way past that before. Diodes can take a lot of abuse.
I do however have a ballasting resistor at about 200 ohms that a switch into the circuit to pre-charge the bus caps before I go and directly connect mains using a contactor.
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voltage doubler for drsstc, questions from a newbie
