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4hv.org :: Forums :: Electromagnetic Projectile Accelerators

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how to protect the electrolytic capacitor bank from back emf

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LAN_403

Conundrum

Fri Feb 17 2017, 04:50AM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061

Yeah, +1 on the whole "shrapnel" thing.
I once had a near miss with a PC power supply where due to a fault the two capacitors were fully charged. Fortunately was wearing yellow sunglasses so avoided any damage. #include "SAFETYGOGGLES.h"

Enceladus

Fri Feb 17 2017, 08:02AM

Registered Member #61428 Joined: Sat Jan 14 2017, 12:39PM
Location:
Posts: 50

DerAlbi wrote ...

Enceladus, the diode in series to the cap bank does not work. Think again.
Antiparallel diodes are the only way to go.

Yeah, I actually had my doubts about this idea but it seemed to make sense. I Have a small camera flash module based CG whose cap I've been protecting by simply placing the working coil in series with the flash tube. It works well and doesn't seem to back-charge the cap but I know the flash represents lost energy. I was planning on using a series diode with a relay after removing the tube but I decided to take a moment to simulate it after reading your comment and it appears you are quite right. I guess I'll be using an antiparallel diode.

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