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Registered Member #6038
Joined: Mon Aug 06 2012, 11:31AM
Location: Salado, TX
Posts: 248
I wanted to run a power source config past the experts. Using caps I already have I hoped that I could create the voltage doubler with smaller electrolytics and use the quality RIFA tightly mounted to the IGBT. I think this configuration works but would welcome any thoughts or concerns before I build it.
C1 and C2 are Cornell-Dublier 1000uF/200V electrolytics in parallel to give 2000uF at 200v across each branch of the doubler and to provide smoothing. The RIFA 3400uF will then provide the reservoir for pulse discharge and additional smoothing.
Input current draw should be less than 15A for this coil - the rectifier is rated for 35A.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Well, with 15A RMS input you are putting 10.6A RMS through each branch of the doubler, thus 5.3A RMS in each individual capacitor.
That's almost twice the datasheet ripple current rating (which is RMS) but for intermittent duty in a Tesla coil, you should get away with it easily. The datasheet rating allows the cap to pass that current continuously in a high ambient temperature for something like 2000 hours before it dries out.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
I would also add some bleeders across the capacitors which will act as balancing resistors as well, but argubly not required.
But the bleeders are important for safety. I usually size mine to be able to discharge the full stack in 5 minutes. This is usually just a 20k, 5W resistor across each capacitor for a 340VDC total bus voltage.
Registered Member #6038
Joined: Mon Aug 06 2012, 11:31AM
Location: Salado, TX
Posts: 248
Absolutely agree. I followed that from your minibrute design I built and it's great to know that those caps are discharging when you power down. It's an essential safety feature IMO. If I remember correctly I used 10W/6k resistors for the minibrute coil and that worked well too.
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DC Power source
