Shorting coil gives back more power

[gyulasun]

Hi Laurent,

Ok, I will study your schematic and comment it tomorrow.

Sorry for the picture problem, somehow it got renamed to extension jpg but it was a png file.  Now I fixed it to be a real jpg file and attached it here. It is the same schematic I showed you here:
http://www.overunity.com/index.php?topic=10398.msg276291#msg276291 using the simplest reed control for the two FETs.

Gyula

[Qwert]

Pulse Switching for High Energy Laser
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19820016542_1982016542.pdf

[gyulasun]

Hi gyula

Yes the picture of your reply  156 to David does not open for me.

The 3 test are made without the Transistor circuit. i use the circuit as per the  included pix, i also tried the modification you have proposed for this circuit but it did not work for me. I know that this circuit seems strange but it works as it is, i mean  with the connection between the 0 of the Hall sensor and the Source of the fets.  Doug seems to also use it in his schematic.
Finally i replicated the circuit with the transistor 2N2222A as per your recent schematic and got no succes, as if it does not short the coil at all . I will check all this tomorrow.

Anyway thanks for the input and good night

Laurent

Hi Laurent,

I studied the schematic you show above. Now I understand it and although it is a strange interpretation of using a Hall sensor, it is correct. In fact I never checked it critically because Doug wrote it worked (he drew it first) and I did not check how the Hall device is connected. 
The strange thing in it is that the positive supply pin of the Hall directly goes to the gates of the FETs, hence the positive 9V (or any supply voltage up to 18V or so) is also directly goes into the gates. And the output of the Hall sensor goes directly to the source of the FETs and the 10k resistor is between the gates and sources, i.e. between the positive supply pin and the output pin of the Hall. And there is no any connection between the negative point of the 9V supply and any other points of the FETs.  When the Hall sensor is activated by a coming magnet the output pin of the Hall simply connects the negative polarity of the 9V battery to the source electrodes of the FETs, hence the FETs can conduct and when the Hall switches off its output pin goes open circuit again and the FETs gate-source capacitance is disharged by the 10k resistor, this is how the FETs switch off.
Now it is clear that my earlier suggestion with the gray and blue wires in this link is wrong: http://www.overunity.com/index.php?topic=10398.msg276272#msg276272  and very sorry for not giving a deeper understanding of your (i.e. Doug) schematic on the Hall connections EARLIER.
(Normally the positive pin of a Hall sensor goes to the gates of the FETs via a resistor (of 5k-10k-22KOhm) and never directly, and normally the negative pin of a Hall goes directly to the sources of the FETs, and normally the output pin of a Hall goes directly to the gates to control them.)

Regarding the 2N2222 circuit, if it still does not work for you, I suggest some measurements with a voltmeter when the 9V battery is connected but there is no any magnet near any of the Hall sensors. In this situation (I refer to the schematic here: http://www.overunity.com/index.php?topic=10398.msg276614#msg276614 ) please measure the voltage directly between the base and emmitter of the 2N2222: it should show any value between 0.62 to 0.7V, i.e. a normal forward bias for a Silicon transistor. (DC voltmeter positive probe goes to the base, negative probe goes to the emitter)
And then please measure also the voltage between the collector and emitter of the 2N2222: it should be under 0.2V i.e. the saturation voltage (V_sat) of the transistor. (DC voltmeter positive probe goes to the collector, negative probe goes to the emitter)
Now if these two voltages are ok, then please put a magnet with correct pole near to one of the Hall sensors and check whether the collector-emitter voltage of the earlier 0.2V changes immediately to the 9V battery voltage? If not, there is something wrong: either connection problems, wrong wire places, wrong transistor, wrong Hall device etc. And then repeat the same test with the other magnet pole for the other Hall sensor, it should cause the same changes in the voltages as the previous pole did.

Thanks,  Gyula

[woopy]

Hi Gyula

thanks for input

now we are OK on the basic circuit. Just for info i tried the same circuit with only 1 FET and it doesn 't give good results.

So now i am trying to test different coils and core to see if i can increase the "produced shortage voltage" and the spectrum seems to be really large. as each system produces very different results . But so far the constant direction remains.
For a given system, the shorted pulsed  produced voltage stays constant at all rotor speed.
So to be very clear ,if the speed of the rotor increases, you get more pulses of the same voltage, but never  a higher voltage.

OK it is only the beginning and perhaps tomorrow will bring better ideas

Good luck at all

Laurent

[bolt]

This is quite old technology for a few of us although some of you have only just started to use it. Kone has been shorting coils on his generators for a few years now and advancing to multiple shorts per sine wave PEAKS only. For each time you hit the coil peak sine wave the power is amplified again and again reaching hundreds of volts from what would normally be just a few volts without shorting. Its a hammer on the bell!

To do this properly requires an AVR/ Arduino/PIC  micro processor to sample the incoming wave form then apply 5 to 100 shorts each lasting just a couple of uS's right on TOP of the sine starting 2 degrees BTDC and ending 2 degrees ATDC creates incredible high power and high frequency harmonics.

The "poor mans" version is to use 555's in order of Zero Point Schmitt trigger, Sine wave peak delay, Window Width generator, Coil shorting Spike Astable running usually at least 20 to 100 times faster than carrier the o/p goes into coil shorting IGBT's rated at least 1500v and very low turn on ohms. This type of setup with a large heavy coils should generate hundreds of watts.

This modulates the carrier and these harmonics can then be pulled off using series resonance tuned RF alike demodulator power stages more advanced then just adding a cap and hoping for the best. Requires RF tuning and matching skills to capture this properly without wasting it.

Its the basis for Ismael Aviso MEG technology once you get up to shorting coils of several thousands of volts and dumping into HV oil caps.

BTW try adding neo magnets in 5 to 1 ratio as Magnacoaster and drive only at the Bloch Wall. Now you have solid state generator and dump those reed switches and halls no longer required.