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Author Topic: TP600 - TPU PULSER  (Read 24305 times)

z_p_e

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TP600 - TPU PULSER
« on: July 24, 2007, 02:52:02 PM »
Upon request from a fellow researcher, I set out to design what I hope is a useful pulsing circuit that anyone can use in their TPU research. It is by no means limited to TPU research, but it was designed with the TPU in mind.

See the document for details, but in brief the unit provides:

- 50% duty cycle square waves from ~0.4 Hz to about 13 MHz in 7 ranges.
- 3 independent outputs, OR 3 synchronized (harmonically) outputs with one control.
- Generators, drivers, and MOSFETs all in one circuit.
- Relatively cheap to build.

Comments welcome.

Enjoy,
Darren

UPDATE: 2007 AUG 04

I've completed the TP900 design with the added Pulse Width function. Pulse Width range is from 5ms to 17ns. Hope it meets everyone's expectations.

Cheers,
Darren

UPDATE: 2007 AUG 07

Revision update from TP900.1 to TP900.2 due to resistor value error on R10, R16, R22. Should be 33k. The TP600.1 design is unaffected and remains unchanged.

UPDATE: 2007 AUG 31

documents have been removed, pm me if interested

UPDATE: 2007 SEP 22

Due to lack of responses and feedback, the documents will no longer be available.
« Last Edit: September 22, 2007, 01:30:44 PM by z_p_e »

dutchy1966

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Re: TP600 - TPU PULSER
« Reply #1 on: July 24, 2007, 03:26:37 PM »
Hi Darren,

Thanx for putting this out here, well appreciated!
 I'd like to ask if it is possible to adapt the design in a way that a much smaller duty cycle becomes possible. Lately a lot of ideas require a very small duty cycle. If that is possible it would make it even more flexible...

Regards

Robert

z_p_e

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Re: TP600 - TPU PULSER
« Reply #2 on: July 24, 2007, 04:11:22 PM »
Hi Robert,

Thank you.

Yes, a more advanced design is already in the works...the TP900.

This one may have a higher frequency capability, with better phase matching on the synchronized outputs. Gate propagation delay becomes a significant factor when dealing with frequencies in the MHz range.

As a minimum, the TP900 will have a "programmable" (repeatable, accurate and matching pulse widths between outputs) pulse width output down to 5ns or so.

Regards,
Darren
« Last Edit: July 24, 2007, 06:19:42 PM by z_p_e »

Super God

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Re: TP600 - TPU PULSER
« Reply #3 on: July 24, 2007, 04:26:42 PM »
Yes! Very good.  This was a great idea.  Keep it coming!

turbo

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Re: TP600 - TPU PULSER
« Reply #4 on: July 24, 2007, 06:33:59 PM »
tHANKS  Darren :)

i think we can switch in something like one shot timers to take the control over the duty cycle.

i will order the parts and get building.

Marco.
 

helmut

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Re: TP600 - TPU PULSER
« Reply #5 on: July 24, 2007, 06:36:14 PM »
Upon request from a fellow researcher, I set out to design what I hope is a useful pulsing circuit that anyone can use in their TPU research. It is by no means limited to TPU research, but it was designed with the TPU in mind.

See the document for details, but in brief the unit provides:

- 50% duty cycle square waves from ~0.4 Hz to about 13 MHz in 7 ranges.
- 3 independent outputs, OR 3 synchronized (harmonically) outputs with one control.
- Generators, drivers, and MOSFETs all in one circuit.
- Relatively cheap to build.

Comments welcome.

Enjoy,
Darren

Hi Darren
I like to buy one . Can you or anyone help with a prefinnished circuit?
pls.pm me your answer.

Thanx.
helmut

z_p_e

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Re: TP600 - TPU PULSER
« Reply #6 on: July 24, 2007, 11:12:21 PM »
tHANKS  Darren :)

i think we can switch in something like one shot timers to take the control over the duty cycle.

i will order the parts and get building.

Marco.
 

You're welcome Marco.

As you wanted something basic, I didn't design the one-shot into this version, but I had always intended on designing one for myself with variable pulse width included.

I would encourage you to wait for this next version rather than inserting something like a 555 one-shot...you'll be disappointed with that.

I have a very good pulse-width method in store for the TP900. I'll try to design it so that you can simply modify the existing TP600 circuit, provided you have left room for it on your board.

Regards,
Darren

turbo

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Re: TP600 - TPU PULSER
« Reply #7 on: July 25, 2007, 05:39:40 PM »
okay
:)

indeed i was thinking 555 but as you said it won't do then i will look for something diffrent.

Marco.

wattsup

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Re: TP600 - TPU PULSER
« Reply #8 on: July 25, 2007, 08:47:21 PM »
@Darren

This is great.
I am going to wait for the TP900 and have it made locally by a small EE company.

I have a few simple questions that will help me clarify at my EE level.

1) Are the F1, F2 and F3 positive dc outputs that are pulsed on and off as per our chosen cycles per second.
1A) Is the applied pulsed voltage adjustable on the F1, F2 and F3?
2) If 1 is yes, do all three pulsed coils share the same negative?

Just as a maybe some day thing, here is a wish list;

3) If 2 is yes, can there be seperate negatives also pulsed?
4) If 3 is yes, can there be option switch for reverse polarity per every 2nd on pulse?
5) If 4 is yes, can there be a second level per channel for frequency generator pulsing on when the coil pulse is off, and off when the coil pulse is on?
6) If 5 is yes, can there be another input/output per channel for capacitor charge/discharge control?

I am too low level EE to do this myself. But I know how I would eventually like to pulse and control components and the above would be a very good work tool. Actually for me it would be a dream come true if such a circuit was available. I could have it made for me locally.

If you ever need me to make a block diagram of the full logic let me know and I will lay it out. Like I said, I'm crap in EE but top notch in logic systems.




z_p_e

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Re: TP600 - TPU PULSER
« Reply #9 on: July 25, 2007, 11:25:13 PM »
@wattsup.

I'm not sure you have a good understanding of how the generator works, especially at the MOSFETs, so allow me to explain a little. I am going to answer your questions 1-2, and if after you still have further questions, I'll try my best to answer them.

The Drains of the MOSFETs are not outputs really. They are better described as INPUTS. Think of the MOSFET simply as a single-pole, single-throw switch. Whatever is on its DRAIN, will be switched to ground.

Normally for pulsing coils, one end of the coil is connected to V+, and the other end of the coil is connected to the MOSFET DRAIN. So the MOSFET is switching the coil to ground. "Ground" is common to the V+ ground, so they are all the same grounds.

1) So, the MOSFET's switch the coils at the rate chosen by the controls.

1A) The pulsing voltage driving the MOSFET gate is not adjustable.

2) All 3 coils share the same negative or "common".

Again, simply think of the MOSFET as a switch, nothing more. The "DRAIN" would be the input to this switch. The other end of the switch is grounded.

Hope that explained it well enough ;)

Cheers,
Darren

z_p_e

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Re: TP600 - TPU PULSER
« Reply #10 on: July 26, 2007, 03:55:19 AM »
PULSE WIDTH QUESTION

@All,

What range of pulse widths would folks here like to have?

Here are some examples:

1) 100ns ~ 500ns in 100ns increments
2) 50ns ~ 250ns in 50ns increments
3) 20ns ~ 100ns in 20ns increments
4) 2ns ~ 510ns in 2ns increments (deluxe $$ implementation)

Perhaps longer than 500ns?  ???

Thanks,
Darren

z_p_e

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Re: TP600 - TPU PULSER
« Reply #11 on: July 26, 2007, 07:17:12 AM »
In reality guys,

We have limiting factors to consider.

The power MOSFET takes minimum 50ns from 10 ~ 90% to turn on, and about the same to turn off. Therefore to leave some margin and also give the coils some time to energize, I would suggest that the shortest pulse width be about 500ns. Does this make sense or am I off track here?

I really doubt SM went beyond 1 MHz with his frequencies, and so I propose that the longest pulse width be 1us, which will limit the operating frequency to 1 MHz.

One RANGE position can be eliminated, and so a 6-position rotary used instead of a 12-position.

Any thoughts?

Darren

Dingus Mungus

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Re: TP600 - TPU PULSER
« Reply #12 on: July 26, 2007, 08:04:04 AM »
Either way I would still want to build one, but I will say since this driver could be mulit use in our kind of research, that perhaps keeping as much of the upper range as possible would be worth while still. I'm mainly saying this because you can typically buy 10hz-10mhz pulse gen on ebay for 30-50 bucks.

Thanks for designing these great units! I'll be building the 900 model soon!

~Dingus Mungus

otto

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Re: TP600 - TPU PULSER
« Reply #13 on: July 26, 2007, 08:14:23 AM »
Hello all,

as we know the highest frequency for a 15" TPU is 245kHz maybe its enough that the pulser can reach 500 - 1MHz.

@Darren

veeeery nice job done. Im waiting for the 900 design and then I will build it.

Otto

turbo

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Re: TP600 - TPU PULSER
« Reply #14 on: July 26, 2007, 08:52:31 AM »
hi Daren,

considering the lightning band app.246khz they have to be as fast/short as possible.
lightning itself does not last seconds, it's there and then its gone.
with transistors and the rlc comes the dirty harmonics.
this does not happen when using crystals.

"sorry, theze are not piezo stacks, however they look like it"

that could point out to perfect frequency using quartz, so pherhaps we can do an add on for inserting crystals? (Pierce Colpitts)

However these do have responses at approximately three times this fundamental frequency, five times, seven times, etc.
Those are for example the third overtone(5000Hz), fifth overtone(35000Hz), seventh overtone(254000Hz), etc.

Marco.
« Last Edit: July 26, 2007, 09:33:42 AM by -[marco]- »