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Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
Physics Junkie wrote ...
The 121 khz is the frequency without the top load, you will want to make note of the frequency with the top load for more accurate matching of primary and secondary frequency. and I cant tell from the pics but when you calculate the primary frequency, don't forget about the capacitance of your mmc (you may or may not be using one with ZVS driven sstc)
I don’t want a top load though, i want just a break out point. Do i need one?
And i thought the capacitance that the calculator came up with was the mc for the ZVS
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
Oh okay. No you don't need a top load. For the coil you are making, I believe a top load would be entirely for experimental purposes. For the mmc, I see what you mean. So yes, the .1622 uF is the required C but wintesla is estimating these values so that your primary frequency will match the secondary at roughly 121khz. Like Steve Conner said, you will want to tune the primary slightly lower, something like 10khz. Experimenting with different number of turns is a good way find the best frequency. Something I do is calculate the primary frequency for say, 7 turns, 6.5, 6, 5.5, 5, and so on... and I will test the number of turns that are just under my secondary frequency to find the best results.
Edit: im not sure how you got 41Khz, with the values given by wintesla, I calculated 121khz. Run through your calculation again. Also, it never hurts to try other programs like javaTC and compare results, double check everything, and maybe take averages
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I don't know how Wintesla is calculating the number of primary turns, but it's probably wrong. For a ZVS running off a low voltage supply, you'll want 1 turn wound bifilar as in the Skori coil, which is 2 turns as far as the tank capacitor is concerned.
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
Steve Conner wrote ...
I don't know how Wintesla is calculating the number of primary turns, but it's probably wrong. For a ZVS running off a low voltage supply, you'll want 1 turn wound bifilar as in the Skori coil, which is 2 turns as far as the tank capacitor is concerned.
ok so i was planning on starting with 3+3 tap turn primary, so should i double the capacitance and add and take away turns to tune it.
what kind of power should i use, i was thinking about using my 40v smoothed mot power supply, that should be enough voltage to get an output.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The ZVS needs a centre tapped primary with tight coupling between the halves. That is best achieved by making it out of two wires twisted tightly together. Connect the end of wire 1 to the beginning of wire 2, and use this point as the centre tap.
The downside of this is that you can't add or remove fractions of a turn any more. So, I suggested tuning by adjusting the capacitance.
You can also make the ZVS with a coil that has no centre tap, just use two DC link inductors, one feeding each end. That would let you use a regular Tesla coil primary.
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
Steve Conner wrote ...
The ZVS needs a centre tapped primary with tight coupling between the halves. That is best achieved by making it out of two wires twisted tightly together. Connect the end of wire 1 to the beginning of wire 2, and use this point as the centre tap.
The downside of this is that you can't add or remove fractions of a turn any more. So, I suggested tuning by adjusting the capacitance.
You can also make the ZVS with a coil that has no center tap, just use two DC link inductor, one feeding each end. That would let you use a regular Tesla coil primary.
I got the fist part, but the second part through me off a little. It sound easier to use a regular primary, could you provide a diagram to help me understand. Also, is my calculated capacitance ok, or was it incorrect?
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