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*To*: tesla-at-pupman-dot-com*Subject*: MMC : dV/dt max*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Sun, 01 Apr 2001 14:55:28 -0600*Resent-Date*: Sun, 1 Apr 2001 15:12:03 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <ncF0nD.A.1SG.gm5x6-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Samuel Rosset by way of Terry Fritz <twftesla-at-uswest-dot-net>" <samr-at-bluewin.ch> Hi everyone, When my WIMA MKP 10 I used for my MMC were destroyed, someone on the list suggested that I should check the pulse rise time : dV/dt max. It was 250 V/us for the MKP 10 and 3500 V/us for the FKP 1 I plan to use. But I wanted to know how to calculate this dV/dt max for my MMC. After manipulating equations, I found that the max pulse rise time was given by : dV/dt max = (sqrt(C) * Uo) / (n * C' * sqrt(L)) C : Capacitance of the whole MMC [F] C' : Capacitance of a single cap [F] n : number of strings of the MMC Uo : Charged MMC voltage [V] L : Primary coil's self inductance [H] which gives me 984 V/us for my MMC, which would explain why it failed Has anyone tried to calculate this pulse rise time? Did you get the same result? For those who are interested and have the time, the detail of the derivation can be found at : http://www.chez-dot-com/samr/mmc/mmc.htm Tell me if this seems right Thanks in advance Samuel

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