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Hi Mike,
Nice running system!
Assuming your DC bus voltage is currently a maximum of 13.4 kV or so
(9.5 kV x 1.414), the DC charging supply will charge your tank cap to
about 2X this, or about 27 kVDC. You'd need to increase the DC voltage
rating of your tank cap to at least 54 kV to safely handle the
peak-to-peak ringing voltage when your gap fires. You can reduce the
low-voltage drive to your pig, but in all cases the DC rating of your
tank cap will need to be a minimum of 4X the maximum DC bus voltage in
order to safely handle both ringing and voltage doubling from the
resonant charging circuit.
Bert
mike tucknott via Tesla wrote:
Hi All
I`m in need of help and advice - re DC charging V AC charging.
At the moment I`m running out magnifier coil on AC, power comes from a
15KvA pole pig set to output 9.5Kv (it`s the way I wired it when I
rebuilt the thing), my primary cap is of the MMC type and is 0.017uf @
28kV, I`m running a super series rotary spark gap with a rotor speed of
0 - 10,000 rpm.
The best performance so far is V in 230V @ 20A with a brake rate of
aprox 650bps the max arc lenght so far is around 6 too 6 1/2 feet (and
as you can guess I want more)
My thoughts are to run the pig output through a full bridge made of 4 HV
diodes rated at 25kV @ 2A`s then through a set of smoothing caps ( 3 x
7.5kV DC @ 2uf for a total of 22.5kV @ 0.66uf) then through a de-Qing
diode again 25kV@2A`s then an HV inductor.
This way I`m hoping my MMC will see a much higher voltage (More voltage
more bang)