Use for the Tesla Switch

[nvisser]

Only one switch works even better.
See post 2661

[StevanC]

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.

[StevanC]

the circuit "wizard" explained )

Steven, or anyone else that recognises this format.

What program are you using
hat uses a dark background please ?

@WeThePeople

sorry, I use Linear Technoly's LTspice/SwitherCAD from here (has merely dark BG) and once all works (=Ques as expected) i do a "maximize" of the window;
"printscreen" screen capture (as bitmap)
and I save usually as a *.png
therefrom I open up GIMP (A GNU kind of "photoshop", only better IMHO)
and there I

• crop the pic (program interface away)
• scale the pic (640x or 800x if small text (avoiding 1024x if possible at all)
• invert (there from I get the excellent contrast :^) )
• add "softglow" effect that emphasizes the edges and makes OCR a tough go
• add "unsharp mask" to give back the good readability to human eye
• eventually add a author/subject/licence line
• finally save it as *.jpg for posting here (won't have *.png ? )

So this is the great "mystery" explained in broad daylight

I like the improved visibility from that,
and the ease of following circuit pathes
to my tired old (Ancient) eyes.

I take that as a compliment to my personal effort, visibility was my original goal, besides a bit of "eye candy" ...

Thanks in advance
(snip)

You are welcome, not that I really helped a bit

You know, once upon a time, somebody asked me:
Q:"are there great looking "wizards" in Slackware, and where are they?"
(Slackware is a sort of GNU/Linux operating system for computers)
A:"well, boy, they usually sit behind the keyboard..."


So, have in mind, there is really no substitute for knowledge as far as I can tell.

Best regards,
Stevan C.

Ah,
circuit design pictures galore continued: (a collectible graphic series "as seen on TV" )

[SeaMonkey]

I twiddled with your pic to bring out data.

At least the Emitters can be identified,
couldn't do anything with the OP amp insert.

Your work is much appreciated by all.

Thanks!

[WeThePeople]

check my circuits ...
Best regards,
Stevan C.

Steven, or anyone else that recognises this format.

What program are you using
that uses a dark background please ?

I like the improved visibility from that,
and the ease of following circuit pathes
to my tired old (Ancient) eyes.

Thanks in advance


SeaMonkey, hope you don't mind.

I twiddled with your pic to bring out data.

At least the Emitters can be identified,
couldn't do anything with the OP amp insert.

[SeaMonkey]

Just out a curiosity...
What about stepping down voltage. Is there anything like that that can step down voltage just with switching no inductor's? Maybe retain some amperage.
I don't want use a voltage divider. Resistance makes heat and capacitors don't allow the amperage to flow well.

Just a side thought.
Matt

Here's a very old circuit from a magazine article years
ago. It didn't scan with a great deal of clarity but by
checking the transistor types you'll be able to determine
which are NPN and which are PNP.

It would be possible to upgrade this circuit with MosFets
for increased efficiency and greater output current.

The voltage regulator as used in this circuit is optional.

[Matthew Jones]

Just out a curiosity...
What about stepping down voltage. Is there anything like that that can step down voltage just with switching no inductor's? Maybe retain some amperage.
I don't want use a voltage divider. Resistance makes heat and capacitors don't allow the amperage to flow well.

Just a side thought.
Matt

[SeaMonkey]

That charge pump circuit SeaMonkey posted is straight out of the document above ( IXAN0009.pdf ) that Bits-n-Bytes posted. This is a bit over my head so I have to ask what is the significance of this charge pump and how can it be useful?

The 'charge pump' is a simple voltage doubler, in
its minimum form, which has many applications.

Look at the circuit configuration for the High Side
MosFet Driver Circuit. Look at Cboot.
(Search for High Side Driver Circuit diagram for layout)

See how it is charged then added to the potential
at the Source terminal of the High Side MosFet?
In order to 'charge' the Gate Capacitance to a
'higher' potential.

It is also abundantly used in low voltage applications
as a 'point of load' voltage boost circuit where a
'doubled Vcc or Vdd' is needed.

With variations it can also be configured as a
'polarity reversal' circuit.

Do a search for 'charge pump' with your favorite
search engine and acquire a 'new look' at a very
old idea.

In virtually any collection of '555 Timer Circuits' you'll
see a very popular implementation of the same
circuit. It's a favorite hobbyist circuit that sometimes
gets 'forgotten.'

The two MosFets which are stacked vertically as
depicted in the diagram, are 'key' to the circuit.

Think 'totem pole.' It is a very common and very
useful configuration that has a multitude of
applications.
the 'key' to the s

[nvisser]

I have redrawn that circuit and it is a normal ac to dc voltage doubler with the big difference that it is pulsed dc of 400Khz on the input with sharp rise and fall times instead of 50Hz ac.
I think I will try this one sometime to see the effect on a battery.

[Matthew Jones]

The battery is supposed to absorb better when the energy is pulsed to it. Lowers the impedance that gets higher as the battery is charged, allowing the battery to take more charge.

Matt

[ewizard]

That charge pump circuit SeaMonkey posted is straight out of the document above ( IXAN0009.pdf ) that Bits-n-Bytes posted. This is a bit over my head so I have to ask what is the significance of this charge pump and how can it be useful?

[StevanC]

Spikes are there (HO-HO-HO (=LoL) )

SeaMonkey, this is the most simple CP yet, is it public domain? Who is the autor?

This seems to be the best favorite yet, I have to run inductance sim befor i go hardware.

thanks a milion!

Stevan C.

[StevanC]

@SeaMonkey,
my apology for spike absence
@all
where did I go wrong before so I didn't get spikes, that I now get?


Best regards,
Stevan C.

[StevanC]

plentora of things and stuff )

Hi all,
I bring stuff and thoughts for all:

1. NOTE: i make errors, check my circuits and check principles against plain common sense? It is possible that i wire up a sketch that has errors in it?

2. I plan to make a 60A variant in MJL before I switch entirely to IRF and 200A
3. The brains are halfway there already (a ATmega48 based Quer from JYETech (namely 07301) (<-Google it out))
4. It will hopefully be a new version of a howto when ready
5. I hope we all make progress here not pointless arguments (please be patient an as polite as practical?) ?

now stuffs:
1. @SeaMonkey, I run tests in SPICE already regarding Your charge pumps (CP) no spikes? maybe negative ones (=bad for battery)? how come?

2. The TS PV AMP has accented unidirectional kicks that are absent in the CP You posted.

3. I re-arranged the components in the drawing You posted, hope You don't mind i re-posted it here, so we (layman) see the process better?

4. The rest are the circuits I'm currently "planning about" The MOSFET and BJT versions checked in SPICE (no hardware yet)...

5. comments:

Best regards,
Stevan C.

[nvisser]

IT is possible that with hi voltage it might work. Some time ago Arron showed HV running through a diode backward. Maybe. Those caps are not going to allow enough flow for 30 hp motor.

I set it up with a bridge and everything I just had the top switch wired backwards. It took 4 looks before I realized.

I apologize to everyone. And especially Vissie.

Matt

No problem Matt. It is good for us to get exited every now and then. It happened to me a while ago that the voltage kept rising only to find that multimeter were faulty.