BTW,
I just came from my workshop... (...akhem :ssht: shed)

You know I had the 7opto Quer build, and You probably don't know I had a same variant with only two optos (one per "channel") built for other purposes.

I used exactly that (has dead time) and used MJL21194 for power handling and two "3040" SOT-247 cased schottky diodes for the rectifiers...

The MJLs are in Sziklay config, the "input" consists of a single MJL21194 driven by a BD140 (PNP)
The output (=heavy kick) consists of two (2) MJL21194 and is driven (both together) by a single MJE15031 (PNP) which while slower, does provide deeper saturation the the two MJL, keeping them from heating up.
This all is munted on a CeleronD class fan+heatsink

The BD140 and MJE15031 are driven by the two optos of the Quer

The Capacitors I used are two 10000 35V "usual" capacitors - non-exotic stuff.

The thing works: kicks as same as the 7xMJL beast with only 3MJL (!)


Stevan C.

Only one switch works even better.
See post 2661

You surely mean this? right?
looks good...
I would really love to see a way to subb those diodes with MOSFET (syncrhonous rectification), but i doubt there is a practical way?

Maybe finding out a way to do it with GaAs BJT (half the FVD, more than twice the speed?), since we are deailing with low voltage schottky, why not bring the GaAs back into the saddle.

a tip for the layman (like I am):
Each boot has a bootstrap - lifting a boot by hands, pulling it "up", is what's called to bootstrap:
the "bootstrap procedure" with supplying power to high side MOSFET drivers, is a procedure where we have the driver's "output ground" ("Vs") going down to "COM" (common ground) and back up (aleviating to a certain potential), but having "picked up" some charge in the "output capacitor" and that charge is also elevated thanking to the diode from Vcc going to "Vboost" and acting like a bucket to an amount of water, lifted from a well.
So, what actually happens, is: we "feed" the drivers floating output capacitor while the output is near "COM", and use this charge up while it is "high".
We are limited in doing so by the size of the output capacitor, the allowalble current to charge it, and the time we count on the charge to supply the gate with "potential", as most drivers shunt the gate low as soon as the Vboost falls below a certain treshold (usually 7V). This, again, is called undervoltage lockout...

back to all:
@all

I plan now on going MOSFET next, with a 5V driven controller based on ATMega48 from here programmed with this like this: http://jye-tech-oscilloscopes.google...Mt0t6nY0uV5FIQ
for the rest refer to few posts back and the IRF3205 based design

TY sir,
I find humor in any forum software that doesn't
accept an internet specific format like PNG...
(Portable NETWORK graphics)

All the rest of your steps are familier too.

Thank you.

@WeThePeople,
You are welcome sir

@all
Did You know (a collectible series):
1. This thread is the second most viewed thread on this forum, right behind the Waterspark plug
2. This thread is (currently) the second replied to right behind the COP17 heater thread.

But we are (obviously) working at it to become the top most ain't we

Best regards,
Stevan C.

captain's log entry 2010.8.21

- killed a MBR3040 diode probably the output one
- while it lasted, i noticed the forward current is not interrupted while in between "kicks", so this is effectively the BJT boos variant specimen I posted earlier in my 6er issue?
while this really maxxes up the the harvest off the PV, it really seems to kick the diode in the pants?
- while it worked, it ran as high as 2A continuous and as high as "5A+" amp-meter needle swing.
- it's a flaw of my setup I can kick only from more than 12V, but I tweak this later down to 5V

/end log entry 2010.8.21

Stevan C.

I found this article sometime back. Just found it again, finally. I think it might be whats happening in my circuits when I run on high a switching rate and drive a motor.
http://relays.tycoelectronics.com/ap...fs/13c3206.pdf

If anybody knows of info about this same subject or something similar could you post it for me.

The article doesn't account for the source of the power they just talk about the in rush of amperage due to the lack of CEMF in the transformer.

Matt

I found another article from ST that describes the problem and how to resolve it by using correct turn on times based on the wave form.
http://www.st.com/stonline/books/pdf/docs/3579.pdf

In section 1.2 they discuss the problem.
In appendix A they give math for calculating.

I think very strongly this a good thing in our case or the case of a 4 battery switch.
If you look at the description of the problem this is not far from the same effect emitted by a negative resistance oscillator. Except, this problem (Or not) is pumping current and not voltage.
It not an effect that is caused from an excessive draw of current either. Its do to the remnants of coil saturation. The CEMF in the core amplifies the the current of the incoming energy. In the Tesla switch we are asking for this to happen. Especially in cases where an AC type signal is produced across one wire on a flux.
If the entire process is contained and controlled we could possibly see more output on the secondary windings of a transformer. If there are no secondaries then we see a rush of power into the switch or the battery. This could create and inductive type spike that is not easily measured or viewed as its current and not voltage. It would defendantly explain the reaction I see in a motor followed up by the burnout of the switch's. But still a mystery is why it happens on a rectified load. And why would inductiove protection stop the problem?

I hope some one agrees with me after reading. From what I can tell no one else is seeing any effect's like I have come across.
I gotta find a cheaper switching technique so it can be replicated.

Done babbling
Matt

This is a nice read Matt. This brings back my earlier days when I hade to figure out strange phenominas due to "harmonics" and the effect they present to a circuit. Not to mention the inductive and reactive environments thrown into the mix. Some of the studies that I have done are surrounding the 5th harmonic. Not to get to deep here, but visualize your standard sinusoidal and on the upswing of the "negative" pulse, now invision yet a full and complete AC sinusiodal. Werid stuff, but if we could capture this energy, whilst in the negative branch, we would not see any current presented to the circuit producing the phenomina.

Anyway my 2 cents.

Jeff

That my point exactly Bits. How to extract that energy. We use diode the outgoing wind of monopole to grab the transient voltage spike, There has got to be a way to divert this surge.

I have no doubt with enough time that can be found but the biggest problem is the switching. Burning up $30 relays to get glimpse of it, HURTS .

If I could find cheap switch I know I could invoke the reaction giving me a least a chance to grab it. Its significant for sure.

The other problem I have is, and we all do, No reference for an open looped system.

Matt

http://samplecode.rockwellautomation...t001_-en-e.pdf

Section 2-11 of the PDF talks more about the effect and regulating it through the turn on time of the wave.

Matt

Ok Matt you made me do it. Here is a peek at what I have been working on in an effort to do what you are talking about, as well as LENZ avoidance. It's not perfected. Thanks to Vissie and John Koorn for there input. As John calls it, "The Wilson Coil". As for the construction, the inner coil is 22awg or 5 ohms (still seeing where the optimum is) wound with the "Right hand Rule" to be able to "pulse" the SG. Then the outer coil is (still in expermintation, i.e. 5 filiar, single conductor) wound the "Opposite" direction, filling the remaining space. The inner coil is pulsed from the 2 Cap pulser which accomplishes several things. The first being a pulse to drive the SG, the second is to use a very low input current (500ma) and deliver a 1.5 - 3 amp output pulse, and the third is to create a "very sharp" transiate FLUX (the hidden energy) to influence the "outer" coil. With the outer coil being wound "opposite" early tests are showing a slight amplifying effect on the transient spike and during any current draw on this coil, is actually assisting the pulse "north pole" repulsion. Ok, that extruded some gray matter energy With now a huge transient spike getting delivered to a cap for storage, Viola!, we now have a way to "close the loop" (wihout really closing the loop) if you know what I mean.

Food for thought.

Jeff

I see what you mean. Does the secondary coil hook to the caps or the battery in the 2 cap pulser? Or somewhere in between?
I would guess to grab it you have to have the load on it so the counter flux induced immediately takes hold, is that right?

That would be in line with what Carlos Benitez did. He doesn't talk about direction of the windings though. But explains the need for the recovery to sustain the charge in the battery.

Whats the difference between the transient FLUX and the transient spike?

Hmmm See what I can do.

Thanks alot Bits.
Matt

See above.

Jeff

Is thier a thread started where they are using or making the mechanical 4 battery switch. I see where some talk about making one but seems they just mention it nothing really more.

My electronic skills aren't that good so I been collecting paprts to build a mechanical one to play with.

Thanks Bill

I'm working on one. It's a rotating mechanical commutator. My intent is to produce line voltage (via transformer) and frequency (50-60hz).

Most of these guys are using transistors to get higher frequencies.

It's an interesting circuit Jeff.

I'd suggest a slight modification.

Rather than using the Full Wave Bridge Rectifier
to collect energy I'd use the Full Wave Voltage
Doubler configuration which only requires two
diodes. It does require an additional capacitor
however.

In the event that the positive going pulses and
the negative going pulses from your pickup coil
are non-symmetrical and differ in amplitudes,
the full wave bridge rectifier will not capture all
of that energy. It will only capture the dominant
half cycle.

The full wave voltage doubler will collect each
half cycle at its full amplitude even if they're
different. Then the sum of the two will appear
across the collection capacitors for application
to whatever 'load' you desire.

Thanks.

Jeff

Quick, put the cat back in the bag

I didn't get much time to play with the coil yesterday Jeff, too busy restoring a 6V starter battery with the 2 cap pulser



John K.

Cool.. I'm just getting started on building mine. Got diodes, batteries, and collecting parts to build comutator.

I bought a bunch of 85 Amp diodes for my project, but I just left them on the shelf. You need them for transistors, but since we are using rotating commutators, we can get away without using them. I'm using copper pipe pieces for the contacts. I'll see what I can do about getting some kind of drawing or something to show you what I'm up to. It's painfully simple.

Hi Seamonkey
Something like this?

Just to update You gentleman:
1. I was wrong: no schotky burned trough: cold solder (beware!)
2. The CP (Charge Pump) although working, does seem a bit loading the panel too much (45W panel at sub optimal irrigation times)
3. The MJLs are all doing well (thanks for asking) while i decided to swap the MJE15031 with the BD140 as the lower Vce play a MAJOR ROLE in keeping the MJL saturated well (=working to satisfaction)

The soon I replaced the driver to BD140 that instant the switch "took off" from anemic to "kicking"
I have to take measurements yet...

And i did tweak a bit the "brains" (aka TS-PV-Amp 3525 based "Quer")

Best regards,
Stevan C.
P.S.
Photos coming soon...

Isn't that the identical action of a Bridge with the added capacitance (For what reason I can't see). I mean you put AC in a bridge and the power travels through 2 diodes no matter what. What benifit is the capacitors and rest of the pattern?

Matt

Hi Matt,

I believe with this circuit you will get twice the voltage of a bridge and only half the current. Look at this way: during one half the cycle the top cap will charge and during the other half the bottom cap will charge. Across both caps together you will get twice the voltage of a bridge and single cap, but only half the current because each cap is only getting charged during half a cycle. I hope that makes sense. And I hope I understand it right too.

Carroll

This should work well for the 2 cap pulsar as we need high voltage and little current for it to operate.
So in Bits application he won't need to much turns on his gen. coils to reach the required voltage for the 2 cap pulsar input.
And hopefully less drag if any.
See:Voltage multiplier - Wikipedia, the free encyclopedia
Voltage doubler - Wikipedia, the free encyclopedia

Very interested in seeing. I'm focused on the same basic setup. There is a yahoo group called 'tesla switch' where they were building this type of setup but the group does not seem active at this time. There are some pics there for ideas though.

Simplest diode-less configuration.

I have got several like that. What do you wanna know?
I tell ya I would like to know how to do it in Mosfets...

Matt

Then we must get those "creative juices"
flowing into the brain cells!

In certain applications it is necessary to
utilize what is known as a "Floating MosFet
Driver Circuit."

Some are available as chips.

It is possible to construct your own.

Small toroidal transformers also work very well.

The circuit layout must be analyzed to determine
whether the MosFet Body Diode presents problems
for current switching. If so, then a pair of MosFets
"belly-to-belly" (Source-to-Source) must be utilized
in that/those circuit locations.

First step is to draw up a 'block diagram' with the
proposed switching scheme.

Are you game?

Design Objective:

Implement switching circuit utilizing no more than
six MosFets with no external diodes in current paths.