Ghazanfar Ali Generator - Utlilizing trapped energy

[poynt99]

I think that the simulation does not account for the wire resistance at all ..as there are heavy pulse currents , wire resistance play a huge part ..The resistance of a wire carrying current increases with itself .. Perhaps this has been solved by Ali?

Ali, I would be happy to have some building tips .But  does seem to be a sim error so far

Indeed, wire resistance should always be included when simulations are made with inductors.

I wouldn't call this a "sim error" but I think I know what you mean. In actuality, the simulation is running properly, but something is not being accounted for. That "something" I suspect is an energy injection from the signal generator via the MOSFET input capacitance. That's one reason why the rise time set for the generator seems to affect the effect. It seems the conditions need to be "just right" in order for continuous oscillation to be achieved. I'm waiting for Ali to upload the working ORCAD file so I can confirm my hypothesis.

I can get a similar damped-oscillation effect by replacing the MOSFET with a "switch" with an added "body diode". In this case though, no energy can be imparted to the circuit from the signal generator.

Regarding the resonant tank, I think Ali is already close to optimal. Yes you can use several different combinations of L and C to achieve the same Fo, but the impedances will not be matched. With the present values of 18uF and 337uH, the impedance of each is close to 2 Ohms at 1kHz. This may be an important factor to making it work.

.99

[JJUK]

For those that are having trouble extracting the Multisim files from the overunity.com zip files, please visit http://tinyurl.com/7pzrv7p
or https://skydrive.live.com/redir.aspx?cid=50a6467c23823bbd&resid=50A6467C23823BBD!210&parid=50A6467C23823BBD!209. I will endeavour to keep the folder up to date with the latest zip files uploaded to the thread. If there is anything else that people would like me to share from this space then please let me know.

[hartiberlin]

That "something" I suspect is an energy injection from the signal generator via the MOSFET input capacitance. That's one reason why the rise time set for the generator seems to affect the effect. It seems the conditions need to be "just right" in order for continuous oscillation to be achieved.

Could be. I had earlier in some other circuits the same problems that the input capacitance of  MOSFETs always puts energy into the circuit.

But at 1 or 2 Khz this should be still a fairly low amount of energy and only in the MilliWatts region and Ali is claiming Watts in his output.

Also what he said:

both have internal body zener diode which plays an important role to keep the capacitor C2 charged on every cycle and avoid damping.

seems to be very important, as this zener diode gives the LC circuit always a kick.

Ali, what function generator did you use to drive your circuit ?

Also what ferrite core did you use ?
How did you measure the uH value of this ferrite torroidal coil ?

Where did you get this ferrite coil from ?

Looking forward to your video.

Many thanks.

Regards, Stefan.

[poynt99]

Could be. I had earlier in some other circuits the same problems that the input capacitance of  MOSFETs always puts energy into the circuit.

But at 1 or 2 Khz this should be still a fairly low amount of energy and only in the MilliWatts region and Ali is claiming Watts in his output.

The frequency is of little consequence regarding how much energy it can impart to the circuit. On the rising edge of the function generator square wave, several tens of amperes can flow to the C2 reservoir capacitor through the MOSFET.

But yes, it seems unlikely that the generator could be supplying a continuous 800W of power. More investigation is necessary.

.99

[Ghazanfar_Ali]

@poynt99
As far as 800W output sim file is concerned, dont waste your time on that. It is unstable schematic. Damping occurred after 4 minutes in my case. However schematic of 42 W output is stable. I made it the hardware run for 1 and a half day and the bulb was continuously lighting.
@Stefan
I calculated the L1 using my LRC Meter. I dont beleive in dimensions or number of turns while making inductors coz there are a lot of parameters which have to be catered for. LRC meter is the best choice to measure correct inductance value. I used my Hantek DDS-3x25 Arbitrary waveform generator for my initial run. I was on my way of using a 555 Timer as PWM and a buffer based upon 2N2222A when I was asked to leave for the other station for an official project. Hantek 3x25 gives 3.5V (7Vpp) amplitude. I use Goltek Controller as the core software with it.
Regards
Ghazanfar Ali