I recently bought an ZVS driver from AliExpress.com It's about this model.L1 and L2 Choke are each 93μH,C1 and C2 are 0.33 μF each.I want to determine the operating frequency of the device.On the output A _ B i connected the primary winding of my transformer which is 132μH,by mathematics the frequency should be approximately 18Khz,but when i measure Frequency at the output A _ B with a multimeter( UT61E )it shows me 11KHz approximately.Also when the primary is not connected to output A _ B The frequency remains the same 11KHz.My question!Whether the frequency depends on the L1 and L2 chokes and the C1 and C2?Whether they form resonant tank circuit?How to approach calculation?What determines the frequency?
Electrical – ZVS LC Frequency
zvs
Related Solutions
Wow, where to start...
If you blind yourself from the arc or electrocute yourself, it's your own fault. These sorts of do-it-yourself circuits can produce LETHAL amounts of energy and are easily FATAL.
Now to your questions:
I don't know what this exactly means, but I think it means to wind 5 turns with two separate coils and connect the two middle ones together.
Correct. What you're describing is two windings of 5 turns with the end of the first winding connected to the start of the second winding (technical speak for 'the middle ones').
I used fairly thick magnet wire from a radio shack roll of three thicknesses (i used the thickest). (tell me if i need thicker).
"Fairly thick" is completely relative and not helpful. The 5+5 turn windings are used to source energy to the arc that's formed by the open HV terminals. It's difficult to predict just how much current can flow since (I believe) this sort of self-oscillating, non-controlled design is going to be dominated by parasitic elements and hard-to-control elements like transformer coupling, the resistance of the windings, the layout of the switching devices with respect to the transformer, etc. - so, use the thickest magnet wire that you can fit on the core.
I am planning on winding one myself due to price, so what size toroid core should I buy, is that same magnet wire reasonable for 10 amps or do I have to buy larger, aprox. how many winds do I need to get close enough for the circuit to work!
You should do a complete inductor design. The number of turns on the toroid depends on the core's inductance factor (\$A_L\$) which of course depends on the exact toroid you're going to be using. There's no magic solution here. As for wire, I'd guesstimate 18AWG magnet wire or thicker to minimize DC losses. Go for a toroid that has room for more turns that you calculate, so that you can more easily add more turns if you find you need more inductance.
Third, I have a bunch (like 30) aerovox capacitors. The schematic calls for 6 1μf 270 volt capacitors to make a large bank but I looked and they can get quite pricy especialy when buying 6 of them so I am wondering if these would work.
The idea is to use multiple capacitors to divide up the current, so these in parallel should work. The inductor and capacitor values define the operating frequency (or so a few websites say) so try and keep the same capacitance value as the original schematic as a starting point.
Next, is the flyback itself suitable for a ZVS driver? And is it possible I don't even have to wind my own primary? (maybe it has something like 5+5 turns already built in)
You tell us. It's your transformer, after all. Seriously, "flyback transformer" is a broad term that covers many more devices than those found in CRTs. And I wouldn't trust any windings other than the multi-turn high-voltage one (that's the reason you're recycling a CRT transformer and not building your own transformer, right?)
My main concern is winding the primary of the flyback CORRECTLY and EFFICIENTLY and the capacitor bank and the inductor.
This sort of homebrew work doesn't lead itself to immediate efficiency. You probably won't hit the sweet spot the first few times, especially if you don't have any power electronics knowledge.
Adding the 2nd capacitor did disturb the oscillation and caused the Mazilli driver to latch up which killed an igbt that caused a huge voltage across the other igbt, that also killed the igbt at the other side because you have to put the new capacitor at the zero voltage crossing instant of time, which is impossible to do at such high frequencies, so at first kill the aux 12v power then add the 2nd capacitor, best decision would be to switch off both of the power sources.
Best Answer
Since its a Royer derived circuit, the major component determining the frequency is LC tank itself (C1 & L3 in your schematic). Choke is just used to block AC through it & provide necessary DC current/power. I'll try to simulate it & update this answer.
Edit 1: Here is the simulation of the provided circuit schematic on LTSpice:
We can see that the frequency of the circuit is coming around 22 KHz in the simulation.
Edit 2: Here is the simulation of the provided circuit schematic on LTSpice with 200uH chokes:
We can see that the frequency of the circuit is coming around 19-20 KHz in the simulation. So, there won't be much of a change for different chokes.
NOTE 1: Some components are replaced with generic components due to lack of LTSpice library support.
NOTE 2: Simulations are not 100% accurate as they mostly use & give ideal solutions and don't give real life results. Also its very difficult to simulate Royer Oscillator which I personally faced while designing a Royer based wireless power circuit.