Author Topic: The VIC with resonant cavity project by Steve..  (Read 81434 times)

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Re: The VIC with resonant cavity project by Steve..
« Reply #208 on: February 23, 2016, 01:12:43 am »
After a bit more tinkering, most of the disturbtions are gone...
Only if i enhance the view i still see some ringing....


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Re: The VIC with resonant cavity project by Steve..
« Reply #209 on: February 23, 2016, 03:18:32 am »
well yes, however pulse after pulse you reach saturation under this condition since the primary current is not being allowed to properly discharge since the diode create a path of low resistance for it to keep flowing and so it wont be able to allow the field to collapse...

that can still be the right way, i´m not saying anything... what i see here is that when i add the diode the core saturates and the voltage drops... when gating the voltage rise again untill it saturates again...

to reset the core the dischage path of the diode should have the same impedance of the power supply at least to allow the core to properly reset during off time...

the diode completely kill the flyback voltage multiplication action too... if you add a resistor of proper value you still have a square wave output top but the bottom may be that of negative exponential of a coil discharging into a resistor...

donald L smith tallks about a resistor that must go in parallel with a primary

basically its value would depend on the frequency to be applied but if its usually greater than the impedance of the power supply that charged the coil it will be already enough to reset the core.... since the time it takes to charge the coil depends also on the load side i guess we might think of it as a whole system..

in my case here i have a 250ohm in parallel with the primary in series with the diode... this give me 1000v when i switch off the primary when there is 4 amps into it...

the power supply i use has around 10ohms to 5 ohms depending on the applied voltage on the variac thats because before the full wave bridge rectifier i have  a step down isolation transformer with secondary over rated to have low resistance... so when my variac goes from 0 to 250v the step down makes it from 0 to 100 with up to 10 amps ability i also have a 3 10mf capacitors in series connected to the full wave bridge rectifier output... the dc is isolated from  mains ground in my case..the step down transformer is a variac that i took out of the case and wound enough 18awg wire to give 100v feeding from the similar variac... i guess were 120t cant remember...

in my case steve i´m using tvs that limit the voltage of the primary to a predetermined level depending on the current level

a 400v tvs that will develop 400v at 1 amps have than 400 ohms aproximately of resistance... but adding this in parallel wont bring the resistance down much but wold increase so as would increase the amps handling... since a lower current is discharged thru each device it will discharge at a higher voltage at each theretoo a higher resistance for each ...

its essencial in this design to not allow the primary to burn the igbt of mosfet in use..

using the  diode in parallel with the primary the voltage during the pulse of at the drain of the mosfet should be a little smaller than the dc supply because of the voltage drop of the diode because of the current from the primary...

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Re: The VIC with resonant cavity project by Steve..
« Reply #210 on: February 23, 2016, 03:22:39 am »
there is a kind of match called diode match that can be used that would consist in using a power zenner or tvs rated to the supply voltage to allow the primary to discharge to exact this voltage all its current,... this would allow a perfect square wave! the drain would see under this condition exactly twice the power supply voltage during pulse off...



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Re: The VIC with resonant cavity project by Steve..
« Reply #211 on: February 23, 2016, 03:55:37 am »
some old ideas my friend

this is a circuit i tests once and was capable of lighting a 100 watt light bulb... atually the cicuit tested used 4 cc cores one contained a primary a non dissipative snuber coil and a feed back input coil..

than there was a huge thick bery thick one turn copper wire shorted turn that coupled the other 3 cores.. on the other 3 cores there was two coils one having 300 turns that was the output and there was also a feedback output coil.. .the load was connected to the output coil or using the output coil and subtracting its voltage from the input feedback coil creating an autofeedback thru load...... i stoped testing because i had no ideas to proceed and wss to busy with the university.. but seemed promising ... it was based on the work of tane heins and willian barbat... basically it was a mix of the two ideas...

but the surprinsing effect was that under no load the voltage output was huge....
« Last Edit: February 23, 2016, 04:30:36 am by sebosfato »

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Re: The VIC with resonant cavity project by Steve..
« Reply #212 on: February 23, 2016, 06:36:29 am »
Beautiful waveforms Steve

i never get that positive spike on mine maybe because i dont use a diode across the coil...

this seem like the current is not falling to zero on the coil..

Well, if i remove that diode from across the prim, the totall waveform goes bad..
As far as i understood, a squarewave creates the most harmonics.
So, the better square it looks, the better it must be....
One note on the harmonics,that is a square wave only puts out odd harmonics.If you want any even harmonics it takes a triangular slope

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Re: The VIC with resonant cavity project by Steve..
« Reply #213 on: February 23, 2016, 08:19:30 am »
i just thought of something if we consider the tubes as an infinitely long transmission line... (like adding a capacitor at the end of the tubes) it create a current in such a way that would create a tangential magnetic field that in conjuction with the axial electric field applied therefore current flow thru electrolyte there is formed a magnetohydrodynamic force that would force the ions in one way.. longitudinaly

if the current and electric field keep in the same direction the force is unidirectional

this force can be in the direction of the bubbles flow or in the other way...

what is the required configuration as to move water upwards with the bubbles?

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Re: The VIC with resonant cavity project by Steve..
« Reply #214 on: February 23, 2016, 08:39:04 am »
Beautiful waveforms Steve

i never get that positive spike on mine maybe because i dont use a diode across the coil...

this seem like the current is not falling to zero on the coil..

Well, if i remove that diode from across the prim, the totall waveform goes bad..
As far as i understood, a squarewave creates the most harmonics.
So, the better square it looks, the better it must be....
One note on the harmonics,that is a square wave only puts out odd harmonics.If you want any even harmonics it takes a triangular slope

Thanks! I never thought of that one....


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Re: The VIC with resonant cavity project by Steve..
« Reply #215 on: February 23, 2016, 09:52:53 am »
Crap i told ya wrong on those harmonics :/
Triangle have only odd harmonics too...idk y i thought different.