FUELLESS CAR PROTOTYPE by ISMAEL MOTOR

[thelast]

Anything new?

[truesearch]

@thelast:


I'm afraid not. . . it's been very quite on the "ISMAEL" front as far as I know. I had hopes that something real would come of his work and experiments. However, the longer it goes like this, the more it appears to be another case of "mis-measurement", or maybe "intentional deception", or perhaps even "discrediting/suppression by people in power".


truesearch

[forest]

simple question related to shorting coils : how can I synchronize square wave generator with sinewave so square wave will start when sinewave start (at zero volts) ?

[kEhYo77]

Hi Forest.
The simplest way is to program a micro controller such as an Arduino.
First you have to build a zero crossing detector - to generate a pulse, every time a sine wave AC
goes positive/negative. That pulse will trigger an instantaneous execution of a function
attached to a hardware interrupt in the micro controller.

You can count those pulses as well to determine the frequency and then calculate time needed to start sending signals to do the shorting

[konehead]

hi Forest and everyone
here is very good circuit that can control a bank of mosfets to do coil shorting at peaks.
It was made up by Ron P from Canada and he built one and it works great, so did I, and another person named Justin in USA also built this circuit so its been tested out and works fine.
the first pot you adjust to find exactly where in the sinewave you want to trigger  the switching (mosfets)..so you can have the swtiching turn ON right in middle at peaks, or little before or after ore even down at the zero line area if you want.
the 2nd pot adjusts the "capture width" that you want to have - narrow, or wide...
the 3rd pot chops the capture-period selected up into a frequency of your choosing...
for coil-shorting at peaks, you want to use ultra-low resistance switching, or else too nuch resistance will snuff-out the HV and HF ringing that happens with coil shorting (the ringing created when switch OPENS after shorting coils,  is why the caps will fill so fast and so high)
Its best to have a very narrow pulse width to the coil short, and at peak, in order to make it
non-reflective (no extra draw)
Good idea Ismael gave me is to use many mosfets in paralell - like 5 or 10 this will give you very very low resistance...use a driver chip that can supplly lots of amps so that the paralelled mosfets will all swtich ON-OFF same time. I like the 4421 or the 4422....whihc one you chosse will make the swtihcing Non-SWoff or Noff-SWon...you need this sort of thing for a "two stage" output circuit...(see below)
Also for coil-shorting you should have BIDIRECTIONAL mosfets - that is, two mosfets connected at gate and source leads (or two banks of paralelled mosfets) so the mosfets will switch AC...the switching now occurs between the "leftover DRAIN" leads of the mosfets.
I like to put 10K "pull down" resistors across the gate and source leads of each mosfet, and also one across the whole cluster too, if you are going to paralell mosfets for the low ressitance reason...this way if somethign blows up, the driver chip will fry, but the mosfets will be OK....
If coil shorting, DO NOT hit a load directly with the power from the coil-shorted created ringing HV and HF...instead to rectify it, and simply fill DC caps...this  is your first objective - as fast and as high as you possibly can, ...... then after filling the caps, dump caps to the load  you choose.
at same time during the cap-discharge-to-load  the caps must be  DISCONNECTED from the coils being shorted, when caps do hit the load, this is called a two-stage output circuit....other metthod of outputting the caps is to dump the "collector" caps into a 2nd bank of caps, then  2nd bank of caps hits load - this way the collector caps isolate the coils being shorted from the resistive load (AKA "bucket brigade" method)
here is Ron's "dual 4047" peak sensing/capture/chopping circuit: