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Registered Member #58047
Joined: Wed Nov 25 2015, 12:46PM
Location: South Wales UK
Posts: 3
I'm building a SSTC coil, it will be full H bridge, power supply will be from the mains at about 240V, full bridge rectified and smoothed, so DC rail should be about 330V, i'm thinking a minimum of 500V capacitors, though i do have some 1.5KV caps from a previous coil build, secondary is 6" x 36", resonant frequency will be about 130KHz
Registered Member #42796
Joined: Mon Jan 13 2014, 06:34PM
Location:
Posts: 195
are you talking about the electrolytic cap/s on the DC buss or the DC blocking cap in series with the primary coil?
the value for the electrolytic is dependent on how much current your bridge will draw and a voltage rating of 450V is enough for rectified mains
for the DC blocking you need a foil cap of about 1uF 600VAC or you cab choose a value that is far enough from resonance and for your chosen secondary resonance has a small impedance
Registered Member #58047
Joined: Wed Nov 25 2015, 12:46PM
Location: South Wales UK
Posts: 3
dexter wrote ...
are you talking about the electrolytic cap/s on the DC buss or the DC blocking cap in series with the primary coil?
the value for the electrolytic is dependent on how much current your bridge will draw and a voltage rating of 450V is enough for rectified mains
for the DC blocking you need a foil cap of about 1uF 600VAC or you cab choose a value that is far enough from resonance and for your chosen secondary resonance has a small impedance
Thanks, i was talking about the DC blocking cap, I included some specs in case it was needed, and as you mentioned, resonance has a bit of an impact, i will try the value you suggested once i get around to building the circuit.
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Help with SSTC capacitor value
