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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
one major factor i forgot to consider was this. your using full wave rectified AC sine wave right @120hZ right? i assumed in my previous calculations that you were at constant DC, not pulsing into your bank. let me startup multisim....
i hate to admit this as my ego is so fragile but we may need to consult Radiotech et al., and invoke differential calculus.
maybe you should include a 2000uF cap across the bridge rectifier, then a 140 to 40 ohms in series with your 15,600 uF cap bank, it should reach 380 V in 6-8 seconds. the 2000uF holds your 420v up longer and reduces charge time.
Yes, technically I will need 318VAC output, rectified full wave will yield (hopefully) 450VDC. I plan to put a bulk capacitor on the output to help stabilize the output.
The capacitors I plan on using are 3900uf 450VDC for $29 each from a non ebay seller. I plan on having a 4 capacitor primary bank with 2 2 capacitor banks, for a total power yield at 450VDC of 3.159KJ. Each stage will be triggered by a 600VDC 60A IGBT with an optical trigger with a small hole drilled through the barrel material. At this point, I have no idea what I am planning on using for the barrel, but thin walled aluminum tubing or some kind of plastic or delrin comes to mind. I am using IGBT's instead of SCR's is because I can precisely control switching times, which means I can turn the coil on for precise time periods, unlike a SCR which will stay on until the capacitors drop below the gate threshold. This will allow fine tuning of the firing coils, which means optimal performance. Depending on switching times, I will be able to save some residual charge in the capacitors, meaning I won't have to completely recharge the bank from 0VDC every time (then again roughly 20 seconds for 31200uf isnt bad).
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
it looks like you can charge your 15.6mF cap in 10 seconds or less. i will post a schematic later.
also, how did you determine the 15.6mF value? remember electrolytics can vary wildly, and since this is a near constant voltage charging a RC element, any deviation in C means a deviation in t, therefore t(C).
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Dr. Kilovolt wrote ...
This is for a cap charger? Why dont you just make a voltage tripler?
i think he wants the isolation from the wall, but he could configure the turns on secondary to allow for doubling via diodes, then his winding numbers would be eased. if he has 200v doubled to 400vdc then he could charge too 320vdc in 4 or 5 RC constants or less
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Rewinding a MOT for 300-450VAC
