MMC tank design helper for SGTC, VTTC, DRSSTC and QCWDRSSTC Tesla coils. Results are guidelines to designing a MMC and should always be double checked in your final design!
Inputs are in green. Outputs are in red. Formulas used can be seen below the calculator.
Math used
MMC voltage rating: MMC voltage rating = voltage rating * capacitors in series.
MMC capacitance: MMC capacitance = (single capacitor capacitance * amount of capacitors in parallel) / amount of capacitors in a string.
Primary impedance: Zprimary = SQRT(Lp / Cp).
MMC Xc, reactance: Xc = 1 / (2 * PI * F * C). F is frequency in Hertz. C is capacitance in Farad.
MMC Zc, impedance: Zc = SQRT(ESR^2 + Xc^2). ESR is the combined ESR for the MCC. Xc is the MMC reactanse from above.
Voltage over MMC: Voltage over MMC = Zc * primary peak current
RMS current MMC: Irms = 0.5 * primary peak current * SQRT(on time * bangs per second). Steve McConner.
dV/dt for MMC: Actual dV/dt the MCC sees = (primary peak current / amount of capacitor strings in parallel) * amount of capacitors in a string.
Peak current for MMC: Peak rating = capacitor peak rating * amount of capacitor strings in parallel.
Pingback: MMC calculator added to the online calculators | Kaizer Power Electronics
When you calculate dv/dt why do you use (primary peak current / amount of capacitor strings in parallel) * amount of capacitors in a string
Why not use 2 x pi x Vpeak x Frequency
It just really looks odd to me how you are factoring parallel capacitors into a dv/dt and that you are completely ignoring frequency.
Perhaps my brain is missing some critical hunk of information.
Thanks for any help.
Hey Jay
Thanks for pointing out that I did make a mistake in my calculator, the current dv/dt calculation is only the combined dv/dt value for the mmc which then was to be used in a equation.
Kind regards
Mads