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capacitor for series resonant inverter

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enea

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series resonant inverter

Hi, I'm trying to build an inverter that uses series resonance in order to achieve soft switching, the problem is that I need a capacitor of 0.33uF that can withstand a voltage of 320Vrms at 50 kHz. I have not much experience and I couldn't find any capacitor that could fit in this circuit. Do you know if there is such a capacitor?

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Enea
 

FvM

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resonant inverter pdf

There are only a few capacitor types that offer a sufficient current handling, mainly MKP snubber and GTO capacitors. You may need however a parallel circuit of multiple capacitors to handle the 33A current.
 

    enea

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calculate series resonant capacitor

i found this capacitor **broken link removed** i can use 10 capacitors 22nF/2000VDC/500Vrms to obtain 0.22uF but there is no mention about the current. Another question is if it's reasonable to have so many capacitors in parallel...
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The maximum Vrms versus frequency chart also gives the current capacity. If you don't find a suitable type, that gives the required capacitance and current in one or two parts, the parallel circuit is probably the most simple variant. The large surface allows a good transmission of dissipated power.
 

    enea

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ok, thank you :)
 

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hi, i'm trying to build an inverter with high voltage 300V,what is the suitable n-channel and p-channel mosfet should i used?...
 

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