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Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
This question might be better off in the electromagnetic projectile accelerator section, but as it has more to do with electronics I'm asking it here. A mod can move it if need be.
I would like to control the charging of individual capacitors in a 4 cap bank being charged with a single charger. I could use relays to control which cap is getting charged but I would like to keep it solid state. Could I use low side MOSFETs to cut the ground to all the caps that I don't want to charge? What voltage would this MOSFET see? What would be the best method using either MOSFETs or IGBTs?
Also, when all the caps are isolated using diodes in series with the charger, like is used on most multi stage cgs, what voltage is seen at the point where the charge supply is connected? Is it an average?
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Turkey9 wrote ...
Could I use low side MOSFETs to cut the ground to all the caps that I don't want to charge?
Why use low side, theyll see the same voltage and current. (series circuit rule) I think an SCR may be better here then a MOSFET.
Turkey9 wrote ...
What voltage would this MOSFET see? What would be the best method using either MOSFETs or IGBTs?
I think it will see the full voltage when non-conducting, and full current when conducting. I think an SCR would survive better.
Turkey9 wrote ...
Also, when all the caps are isolated using diodes in series with the charger, like is used on most multi stage cgs, what voltage is seen at the point where the charge supply is connected? Is it an average?
Not sure what you mean, i think your asking if its average current from the charger to the caps while the caps are charging. I beleive you would use integration calculus, for the curve of V/I versus Time, I think.
Thats alot of "I think's" in there, but I think I said all this right.
You might need a E-sim for some of this to play with the values.
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Capacitor charging control
