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Current peak from MMC
One thing that kept me away from considering a MMC to start with, was an
(erroneus) gut feeling, that these small caps would be unable to deliver
enough current. So I tried to plug some data into Excell, and I thought
you might be interested in the results.
The cap of my choise is the Philips KP/MKP 375 series, which is a
polyprop. cap for high pulse applic. like deflection circuits in CRT
monitors. There are datasheets at www.philips-dot-com. and that is where I
got the Dv/Dt values.
Assuming a 0,025 µF cap at 30 KV DC, and using the formula that Marco
posted recently, I came to these results:
(The first row is marco`s example, I included it to check if the formula
was entered correctly.)
Urdc µF dV/dT amp./string Amp. Tot.
0,001 10000 10
1000 0,022 5000 110 3750
1000 0,033 5000 165 3750
1000 0,047 3300 155 2475
1000 0,056 3300 185 2475
1000 0,068 3300 224 2475
1000 0,082 3300 271 2475
1000 0,1 3300 330 2475
1600 0,0047 5000 24 2344
1600 0,0068 5000 34 2344
1600 0,0082 5000 41 2344
1600 0,01 5000 50 2344
1600 0,015 5000 75 2344
1600 0,018 5000 90 2344
1600 0,022 3300 73 1547
1600 0,033 3300 109 1547
2000 0,0033 5000 17 1875
2000 0,0047 5000 24 1875
2000 0,0056 5000 28 1875
2000 0,0068 5000 34 1875
2000 0,0082 5000 41 1875
2000 0,01 5000 50 1875
2000 0,018 3300 59 1238
2000 0,022 3300 73 1238
This doesn`t seem so bad, and since a cap like this can be built for
something like 300 $, that is the route that I will follow.
Finn
gtl-at-lists.uni-marburg.de