Lenzless resonant transformer

[Magluvin]

12 watts circulating in the tank, still it cannot light that tiny bulb. Bulb resistance seems to affect this, maybe it causes voltage to drop in capacitor and energy cannot be used ?

Hey Jack

Is the light bulb in series with the cap and inductor, or in parallel?

Mags

[Jack Noskills]

Jack:

I am not sure what you are talking about here.

The energy in a capacitor is 1/2*C*V*V.    "Q" is used for charge, not capacitance.   The energy crunches out to 99.3 micro-joules of energy.  That's what's circulating in the tank.  What do you mean when you say "12 watts," that doesn't make sense!  We are talking about energy in the tank, not power.

I know it's kind of politically incorrect to correct other people sometimes.  But if people don't correct each other then you have stagnation, and you end up spinning your wheels and making the same errors over and over.   My advice to you is to find a good YouTube channel for beginning electronics instruction.  Watch every clip in the channel until you get it.  Then move onto an intermediate YouTube channel for electronics instruction.

Please don't get offended, I am giving you sound advice.

MileHigh

Ups, I mixed Q with C and dropped the 1/2. Ok, so 99.3 micro joules of energy. This bounces 2*62000 times back and forth via inductor in LC circuit during one second, about 12 joules. I recall that one joule is one watt for one second, so isn't this then 12 watts for one second ?

[Jack Noskills]

Hey Jack

Is the light bulb in series with the cap and inductor, or in parallel?

Mags

I think itsu put the bulb in series but it was not shown in the video. Q-factor depends on the inductive reactance divided by DC resistance of the coil. If we put load there, then it will also increase DC resistance, which decreases Q-factor and hence drops voltage. Not sure but this would make sense.


The inductance of the 100 turn coil was 1 micro henry, to resonate this at 62 kHz there would have to be over 6500 nf worth of capacitors, but 5.5 nf was sufficient. I am now puzzled why. When this coil is used as primary then to resonate it at 62 kHz more caps are needed. Maybe easier to put 220 nf in the secondaries, measure resonant frequency of that and then match the primary to that frquency.


BTW, inductance of those two 200 turn secondary coils combined was about 0.4 mH. itsu, what is the core area dimension ? We know that core has 1000 permeability, now I am thinking would this 0.4 mH be inductance of solenoid of the same size. Looped flux is cancelled but solenoid flux still left ?

[itsu]

I think itsu put the bulb in series but it was not shown in the video. Q-factor depends on the inductive reactance divided by DC resistance of the coil. If we put load there, then it will also increase DC resistance, which decreases Q-factor and hence drops voltage. Not sure but this would make sense.


The inductance of the 100 turn coil was 1 micro henry, to resonate this at 62 kHz there would have to be over 6500 nf worth of capacitors, but 5.5 nf was sufficient. I am now puzzled why. When this coil is used as primary then to resonate it at 62 kHz more caps are needed. Maybe easier to put 220 nf in the secondaries, measure resonant frequency of that and then match the primary to that frquency.


BTW, inductance of those two 200 turn secondary coils combined was about 0.4 mH. itsu, what is the core area dimension ? We know that core has 1000 permeability, now I am thinking would this 0.4 mH be inductance of solenoid of the same size. Looped flux is cancelled but solenoid flux still left ?

Jack,

be aware that the L3 coil is 1mH as in milli,  not micro!

As for the core area dimension, see here where it says:

the od (65mm), the id (40mm), the thickness (9mm)

I made a video of some current / voltage measurements on this 3 coil setup, but need some time to comment in it, will be up later today.

Regards Itsu

[verpies]

Ups, I mixed Q with C and dropped the 1/2. Ok, so 99.3 micro joules of energy. This bounces 2*62000 times back and forth via inductor in LC circuit during one second, about 12 joules.

You are ignoring the direction (sign) of energy flow (a.k.a. power).

I recall that one joule is one watt for one second, so isn't this then 12 watts for one second ?

Rather it is 99μJ per 8μs (½ period of oscillation) which is equivalent to +12.3Watts for ½ cycle of the oscillation ...and 0Watts for 1 full oscillation.