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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
0.75uF was too large for my coil running at the 89kHz upper pole frequency with 300 amp modules. For a 50kHz coil with CM600s, it would probably be fine.
The lower frequency means more primary inductance, and the primary impedance is sqrt(L/C). So lower frequency means higher impedance for a given value of C. Also the 600A bricks can handle twice the current, so they can drive half the impedance of my 300A ones.
In another thread I suggested the following relation for sizing tank capacitors:
sqrt(Lpri/Cpri) should be 10 to 20x (4/pi)(Vbus/Iocd). Values towards 10 give traditional DRSSTC operation, values towards 20 allow long bursts with lower current.
(You also know that 1/(2*pi*sqrt(Lpri*Cpri)) = about 0.9x (fres of secondary) so from these two equations you can calculate both Lpri and Cpri.)
From the picture I saw, your coil could do with a bigger topload.
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Odin The All-Fragger: a large DRSSTC
