Chinese Oscillator and MOS FET Driver, Hardware experiment

[Jeg]

Guys, does anyone know how those machines work? It says 230V/50Hz but i feed it with alternating dc at 110KHz and seems that it works normally. What is the catch here? Are we talking about dc motors with a bridge at their input?

In addition, i would like your help on the following.
We see at the china-kapa device that the 28T output of the zvs ferrite transformer, is in series with a cap and an output transformer. The input zvs inductors are of 5 turns each. So 24V/5T=4,8Volts per turn. So 28T X 4,8V equals 134V peak. My oscilloscope here shows almost 200V peak. Why is that? Is it due to accumulation of voltage cycle per cycle? And if this is true then do you think it is possible to raise voltage even more across the 28T coil without adding more turns to it? What the maximum voltage at this point depends of?

Thanks

[AlienGrey]

Guys, does anyone know how those machines work? It says 230V/50Hz but i feed it with alternating dc at 110KHz and seems that it works normally. What is the catch here? Are we talking about dc motors with a bridge at their input?

In addition, i would like your help on the following.
We see at the china-kapa device that the 28T output of the zvs ferrite transformer, is in series with a cap and an output transformer. The input zvs inductors are of 5 turns each. So 24V/5T=4,8Volts per turn. So 28T X 4,8V equals 134V peak. My oscilloscope here shows almost 200V peak. Why is that? Is it due to accumulation of voltage cycle per cycle? And if this is true then do you think it is possible to raise voltage even more across the 28T coil without adding more turns to it? What the maximum voltage at this point depends of?

Thanks

Do you think you might be missing some thing ?  I think the fets are feeding a very loose coupled magnetic coupling across the ferrite core and also the cap isn't any old value it has to be tuned to match the two inductance's do that and see how far you can get. Lx = Cx the play ground swing perhaps.

Also when the guy was winding the coils I also noticed both sides of the wingdings were not equal or was it an illusion.

AG

[AlienGrey]

 One other thing the jig saw is inductive shouldn't it be a restive load ?

[Jeg]

Do you think you might be missing some thing ?  I think the fets are feeding a very loose coupled magnetic coupling across the ferrite core and also the cap isn't any old value it has to be tuned to match the two inductance's do that and see how far you can get. Lx = Cx the play ground swing perhaps.

Also when the guy was winding the coils I also noticed both sides of the wingdings were not equal or was it an illusion.

Hi AG
I don't understand what you mean about loose coupling. It doesn't look loose to me at all. Of course when it is in resonance, then Lx=Cx which gives rise to current. Shouldn't voltage have to follow the turns ratio thing?

About the Chineese's number of turns, there is only one turn difference between left and right coils. 50T and 49T. Not a big difference. The middle coils are of 48T each.

One other thing the jig saw is inductive shouldn't it be a restive load ?

Why to use only resistive loads and not inductive ones? It works with both kinds. But behaves better by using inductive loads. Meaning that COP is higher with inductive loads in this inverter.

[synchro1]

Packing the PVC core with magnetite composit would be much simpler then shaping that rectangular job right?

There is really not much to this build; The coils are household wire! What kind of advantage would there be in building a ferrite core with blocks? Permeability can be controlled with particulate ratio.