Re: High Voltage Thryotron/Thyresistor?

#72884

Yea, the current pulse is CRAZY when one dumps a cap charged at 3kV into another cap. ?I think it those would be blown to smithereens in this application. ?I could be wrong.

Chris KQ6UP

Show quoted text

On Mon, Jun 2, 2014 at 8:23 PM, miller_effect@... [LTspice] <LTspice@...> wrote:

Chris,

IXYS makes high voltage (4.5kv) MOSFETs:

Mouser has them. IXYS has supplied models for their devices in the past, just ask.

ME

Re: High Voltage Thryotron/Thyresistor?

#72883

Chris,

IXYS makes high voltage (4.5kv) MOSFETs:

Mouser has them. IXYS has supplied models for their devices in the past, just ask.

ME

Re: High Voltage Thryotron/Thyresistor?

#72882

Stephen,

Using IGBTs in series is a bad idea unless you use a good method of making them share the voltage during switching.? This is not simple.

Rick

Re: problem of encrypt model LM3150

#72881

Not that it matters, but your schematic also has the wrong parameters (attributes) for the LM3150 device. ?The first listed parameter ("LM3150_tina.sub") should be the name of the subcircuit being called; not a file name.

Your schematic also needs to .INCLUDE the model file.

You could combine the name of the model file in the symbol, by listing it in the "ModelFile" attribute of the .ASY symbol file.

?Andy?

Re: problem of encrypt model LM3150

#72880

LTspice can read only LTspice-encrypted models. ?Models that have been encrypted by any other SPICE program, can only be used by the program that encrypted it.

Regards,

Andy

Re: High Voltage Thryotron/Thyresistor?

#72878

That does sound intriguing.  I am just thinking that a couple hundred
watts would be fine.  I could just find the time constant where
ringing the primary tank just dies out, then -- bam! Dump another
capacitor charge into the tank to ring it again, or generate a square
wave at the resonant frequency of the tank circuit.

Chris KQ6UP

On Mon, Jun 2, 2014 at 6:13 PM, Stephen R Phillips
cyberman_phillips@... [LTspice] <LTspice@...> wrote:
You can use stacked IGBT's much the same way with easier / simpler control, you do need drivers for them and thus you probably should do some analysis. You can get spice models for IGBT's for ltspice, and you can model individual stage power supplies by using optocouplers and 1G resistors (IE theoretrical isolation but still have convergence because it can find a resistor to ground heh).

Panasonic uses IGBTs to drive the magnetron in some of their microwaves, (PWM a magnetron to get variable power output I won't comment as to why they would do that as it gets into some things I barely understand in electronmagnetic theory). Erstwhile they also use IGBTs stacked for driving particle accelerators (syncotrons) so yes you can use them to drive something at a very high voltage.

IXYS makes IGBT's that go up to 4500V (which means you probably could safely use them at 3KV with per layer if being conservative). That may be high enough to drive the excitation coil for  what you want to do. Making a boost supply for it would prove to be a lot of work but possible.

What power level are you talking here?
1kw 2kw 4kw 8kw 16kw 32kw?
2kw and above is 240vac
4kw 240VAC 3phase

You might consider 480VAC 3phase above 8kw

Stephen R. Phillips was here

Please be advised what was said may be absolutely wrong, and hereby this disclaimer follows.  I reserve the right to be wrong and admit I was wrong in front of the entire world. It won't be the first or the last in all likelyness.

On Monday, June 2, 2014 9:41 PM, "marcelhendrix25@... [LTspice]" <LTspice@...> wrote:

Impressive :-)

Why is the noise pitched?

Edvard Grieg is the composer, not King Crimson. I hope our students know that.

-marcel

------------------------------------
Posted by: Stephen R Phillips <cyberman_phillips@...>
------------------------------------

Yahoo Groups Links

problem of encrypt model LM3150

#72879

Dear All,

I had an issue to import the encrypt model LM3150 to ltspice, I uploaded the file:LM3150.zip contains models, symbol and test circuit to the temp folder, look for your kindness to help me on this subject..?

I learned from The model creator-Texas instrument that this model can be run on?in PSPICE 15 .7 or higher, if this help?

Regards,

?

Re: High Voltage Thryotron/Thyresistor?

#72877

You can use stacked IGBT's much the same way with easier / simpler control, you do need drivers for them and thus you probably should do some analysis. You can get spice models for IGBT's for ltspice, and you can model individual stage power supplies by using optocouplers and 1G resistors (IE theoretrical isolation but still have convergence because it can find a resistor to ground heh).

Panasonic uses IGBTs to drive the magnetron in some of their microwaves, (PWM a magnetron to get variable power output I won't comment as to why they would do that as it gets into some things I barely understand in electronmagnetic theory). Erstwhile they also use IGBTs stacked for driving particle accelerators (syncotrons) so yes you can use them to drive something at a very high voltage.

IXYS makes IGBT's that go up to 4500V (which means you probably could safely use them at 3KV with per layer if being conservative). That may be high enough to drive the excitation coil for? what you want to do. Making a boost supply for it would prove to be a lot of work but possible.

What power level are you talking here?
1kw 2kw 4kw 8kw 16kw 32kw?
2kw and above is 240vac
4kw 240VAC 3phase

You might consider 480VAC 3phase above 8kw

Stephen R. Phillips was here

Please be advised what was said may be absolutely wrong, and hereby this disclaimer follows.??I reserve the right to be wrong and admit I was wrong in front of the entire world. It won't be the first or the last in all likelyness.

Show quoted text

On Monday, June 2, 2014 9:41 PM, "marcelhendrix25@... [LTspice]" <LTspice@...> wrote:

Impressive?:-)?

Why is?the?noise?pitched?

Edvard Grieg is the composer, not King Crimson. I hope our students know that.

-marcel

Re: High Voltage Thryotron/Thyresistor?

#72876

Impressive?:-)?

Why is?the?noise?pitched?

Edvard Grieg is the composer, not King Crimson. I hope our students know that.

-marcel

Re: High Voltage Thryotron/Thyresistor?

#72875

开云体育

If you want some real kudos then show your students this though you might have to explain who King Crimson are J

In the Hall of the Mountain King played on a pair of Tesla coils.

?

Suusi

?

Show quoted text

From: LTspice@... [mailto:LTspice@...]
Sent: 02 June 2014 19:36
To: LTspice@...
Subject: Re: [LTspice] Re: High Voltage Thryotron/Thyresistor?

?

Maybe 4 in series dumping a cap from a relaxation oscillator into a LC network for a primary LC tank circuit for a Tesla coil. ?At 4kV I could use a microwave oven transformer and make one hellofa tesla coil on the cheap. ?It would also be quieter. ?My students built a traditional Tesla coil for extra credit, and I did not realize how loud the spark gap is. ?It is DEAFENING.?

?

Thanks,

Chris Maness

?

On Mon, Jun 2, 2014 at 11:23 AM, 'Suusi M-B' smalcolmbrown@... [LTspice] <LTspice@...> wrote:

?

I have done some playing with LTspice and radar psu’s and transmitters.

?

Forget a model of a thyratron I know of none out there.

?

As for a SCR the SK065K seems to fit the bill

?

That said I have been toying with the idea of a using an IRF830 Hexfet as the trigger device

?

Best regards

?

Suusi M-B

?

From: LTspice@... [mailto:LTspice@...]
Sent: 02 June 2014 18:36
To: LTspice@...
Subject: Re: [LTspice] Re: High Voltage Thryotron/Thyresistor?

?

Haha, yes. ?Spelling notwithstanding :D

?

Chris

?

On Mon, Jun 2, 2014 at 10:12 AM, miller_effect@... [LTspice] <LTspice@...> wrote:

Chris, you would not be thinking about thyratron or thyristor, by a chance?

?

ME

?

Re: High Voltage Thryotron/Thyresistor?

#72874

Maybe 4 in series dumping a cap from a relaxation oscillator into a LC network for a primary LC tank circuit for a Tesla coil. ?At 4kV I could use a microwave oven transformer and make one hellofa tesla coil on the cheap. ?It would also be quieter. ?My students built a traditional Tesla coil for extra credit, and I did not realize how loud the spark gap is. ?It is DEAFENING.?

Thanks,

Chris Maness

Show quoted text

On Mon, Jun 2, 2014 at 11:23 AM, 'Suusi M-B' smalcolmbrown@... [LTspice] <LTspice@...> wrote:

I have done some playing with LTspice and radar psu’s and transmitters.
?
Forget a model of a thyratron I know of none out there.

?
As for a SCR the SK065K seems to fit the bill
?
?
That said I have been toying with the idea of a using an IRF830 Hexfet as the trigger device
?
?
Best regards

?
Suusi M-B
?
?
?
?
?

From: LTspice@... [mailto:LTspice@...]
Sent: 02 June 2014 18:36
To: LTspice@...
Subject: Re: [LTspice] Re: High Voltage Thryotron/Thyresistor?

?

Haha, yes. ?Spelling notwithstanding :D
?
Chris
?
On Mon, Jun 2, 2014 at 10:12 AM, miller_effect@... [LTspice] <LTspice@...> wrote:

Chris, you would not be thinking about thyratron or thyristor, by a chance?
?
ME

?
?

Re: High Voltage Thryotron/Thyresistor?

#72873

开云体育

I have done some playing with LTspice and radar psu’s and transmitters.

?

Forget a model of a thyratron I know of none out there.

?

As for a SCR the SK065K seems to fit the bill

?

That said I have been toying with the idea of a using an IRF830 Hexfet as the trigger device

?

Best regards

?

Suusi M-B

?

Show quoted text

From: LTspice@... [mailto:LTspice@...]
Sent: 02 June 2014 18:36
To: LTspice@...
Subject: Re: [LTspice] Re: High Voltage Thryotron/Thyresistor?

?

Haha, yes. ?Spelling notwithstanding :D

?

Chris

?

On Mon, Jun 2, 2014 at 10:12 AM, miller_effect@... [LTspice] <LTspice@...> wrote:

Chris, you would not be thinking about thyratron or thyristor, by a chance?

?

ME

?

Re: Command Mosfet for Buck Boost converter

#72872

You need to provide an appropriate drive voltage between the gate and source, not the gate and ground.

Re: High Voltage Thryotron/Thyresistor?

#72871

Haha, yes. ?Spelling notwithstanding :D

Chris

Show quoted text

On Mon, Jun 2, 2014 at 10:12 AM, miller_effect@... [LTspice] <LTspice@...> wrote:

Chris, you would not be thinking about thyratron or thyristor, by a chance?

ME

Re: High Voltage Thryotron/Thyresistor?

#72870

Chris, you would not be thinking about thyratron or thyristor, by a chance?

ME

High Voltage Thryotron/Thyresistor?

#72869

I am thinking of designing a Tesla coil with a Thyrotron or a
Thyresistor.  What are some examples that have a high breakdown
voltage, and a relatively fast quench time 1/30 of a second or better.

Any suggestions?  Any examples in LTSpice?

Thanks,
Chris Maness

Re: Command Mosfet for Buck Boost converter

#72868

How does this design question relate in any way directly to LTspice (other than you are attempting to create your design in simulation components rather than real components)?? This is not a design forum.

---In LTspice@..., <damageorge_tragd@...> wrote :

Hi andy,

Actually I got a problem simulating the Buck boost using MOSFET as I can't command the MOSFET properly.( the switch is not turning on and off) ?And I'm pretty sure that this is because of the source is not connected to the ground.

Contrary to Buck boost, I did the same thing for BOOST and it works just fine because of the source is connected to the ground. Could you please help me how to solve this problem

Re: Command Mosfet for Buck Boost converter

#72867

Hi andy,

Actually I got a problem simulating the Buck boost using MOSFET as I can't command the MOSFET properly.( the switch is not turning on and off) ?And I'm pretty sure that this is because of the source is not connected to the ground.

Contrary to Buck boost, I did the same thing for BOOST and it works just fine because of the source is connected to the ground. Could you please help me how to solve this problem

Re: Command Mosfet for Buck Boost converter

#72866

'damageorge_tragd'?wrote:

? ?"As you know the source of the MOSFET in buck boost is not connected to the ground, because of its architecture and this leads to a problem. The switch(MOSFET) ?is not functionning ?because of this."

(1) ?I think that is unlikely. ?MOSFET models don't care if they are grounded or not. ?(Unless it was a very poorly constructed model.)

(2) ?Did you have a question? ?Or are you just complaining?

Regards,

Andy

Command Mosfet for Buck Boost converter

#72865

Hello guys,

I would appreciate your help in this. I am doing a simulation for a buck boost converter which needs a Mosfet. As you know the source of the MOSFET in buck boost is not connected to the ground, because of its architecture and this leads to a problem. The switch(MOSFET) ?is not functionning ?because of this.