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Registered Member #3964
Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
Hey Gregory, You said: I'm using some yellow MKT 470nF x 2000V for my 10 foot spark DRSSTC witn no problem.
Is you primary tank rated 470nf at 2000v? normally DRSSTC required some several KV rated primary capacitors isn't it? And why is that? why DRSSTC primary capacitor rated at several KV even if that the pulsed DC is only at range 350vdc?
Is you primary tank rated 470nf at 2000v? normally DRSSTC required some several KV rated primary capacitors isn't it? And why is that? why DRSSTC primary capacitor rated at several KV even if that the pulsed DC is only at range 350vdc?
It is the primary current that matters. The voltage you get across the caps is I/(2*pi*f*C). That can be much larger than the bus voltage.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yep, we usually design for a loaded Q of 10, which works out at a roughly 5kV tank cap for a fullbridge running on rectified 230V mains.
The primary current limiter (which every good DRSSTC has) will also protect the cap from overvoltage, because the capacitor voltage is related to the current through it by its impedance. The impedance depends on frequency, but the frequency of the coil doesn't change a great deal, so it can be assumed constant.
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Primary Capacitor
