24V to 500-1000V, 20W floating DC-DC converter...

[bitrex]

On 7/23/2020 2:32 PM, Phil Hobbs wrote:

On 2020-07-23 13:14, Matt B wrote:
On Thursday, July 23, 2020 at 11:31:26 AM UTC-5,
jla...@highlandsniptechnology.com wrote:
Any decent analog designer could Spice this in an houror two; I
could do it in 20 minutes, but I\'m familiar with the part. All of
the LT3083 boosts and flybacks that I\'ve simulated have worked as
expected. My only problem has been inductor heating, which won\'t be
an issue here with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

I\'ll be taking you up on that offer. Hopefully I can get around to
the design this weekend.


On Thursday, July 23, 2020 at 11:54:02 AM UTC-5, bitrex wrote:
I\'m not entirely convinced OP knows what he needs either, charging
up a 5uF cap bank to 1kV for a piezo driver? sure love to know what
the application is.

Fortunately I do know what I need. Your assumptions, insinuations and
trolling throughout this thread is unwarranted. You are focused
entirely too much on the bypass capacitors. The necessary information
is that I have a load that needs 20W at 1000V.


With that sort of attitude, everybody will be lining up to give you free
help, for sure.

Cheers

Phil Hobbs

I may not be the top engineer on the planet, but I am pretty good at
spotting His Majesty and letting someone else handle him.

 

[bitrex]

On 7/23/2020 1:14 PM, Matt B wrote:

On Thursday, July 23, 2020 at 11:31:26 AM UTC-5, jla...@highlandsniptechnology.com wrote:
Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

I\'ll be taking you up on that offer. Hopefully I can get around to the design this weekend.


On Thursday, July 23, 2020 at 11:54:02 AM UTC-5, bitrex wrote:
I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Fortunately I do know what I need. Your assumptions, insinuations and trolling throughout this thread is unwarranted. You are focused entirely too much on the bypass capacitors. The necessary information is that I have a load that needs 20W at 1000V.

Look pal, if you want to learn about flyback converters, fine. If you
know exactly what you need and want it designed and built to your
precise spec consider hiring an engineer to do it. Or go to a Burger
King if you just want to give orders.

Screening out arrogant asses who don\'t even understand the (hazardous!)
circuits they\'re posting but want to play with even bigger toys is 100%
good policy. If someone else wants to take you on for free I\'m 100%
happy for them to do that.

 

[bitrex]

On 7/23/2020 1:14 PM, Matt B wrote:

On Thursday, July 23, 2020 at 11:31:26 AM UTC-5, jla...@highlandsniptechnology.com wrote:
Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

I\'ll be taking you up on that offer. Hopefully I can get around to the design this weekend.


On Thursday, July 23, 2020 at 11:54:02 AM UTC-5, bitrex wrote:
I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Fortunately I do know what I need. Your assumptions, insinuations and trolling throughout this thread is unwarranted. You are focused entirely too much on the bypass capacitors. The necessary information is that I have a load that needs 20W at 1000V.

Look pal, if you want to learn about flyback converters, fine. If you
know exactly what you need and want it designed and built to your
precise spec consider hiring an engineer to do it. Or go to a Burger
King if you just want to give orders.

Screening out arrogant asses who don\'t even understand the (hazardous!)
circuits they\'re posting but want to play with even bigger toys is 100%
good policy. If someone else wants to take you on for free I\'m 100%
happy for them to do that.

 

[bitrex]

On 7/23/2020 1:40 PM, John Larkin wrote:

On Thu, 23 Jul 2020 12:53:57 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 12:31 PM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 12:00:45 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 11:37 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 11:14:20 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote:
On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 5:23 PM, John Larkin wrote:
On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:21 AM, George Herold wrote:
On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote:
I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter.

My specs are:
Input: 24-28V
Output voltage: 500-1000V adjustable via control signal
Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W)

I\'ve been reading through threads on different HV designs. So far the only one I\'ve come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ

There\'s also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don\'t know enough about making it adjustable and isolated.

Thoughts on how to proceed?

If you are going to try building it yourself, then I\'d start with the
500V 5 mA one first. I built my first flyback with the LT3083,

(2018... thread here
https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ

Good luck. Oh buying a ready made HV supply would be a good thing.
Gives you something to compare to if/when you have problems putting
to whole system together.

George H.


Yep. OP did not like that I disparaged/was skeptical of his plan to
build a 20 watt 1000 volt converter out of the gate but it strikes me as
a certain kind of madness as a first project if OP has not designed and
built a flyback of any type before.

Just different numbers. Shouldn\'t be really hard.


The Thor rocket was just sort of a scaled-up kerosene burning V2:

https://www.youtube.com/watch?v=WYrrVHPur2Y


OK, my bad. It would be really hard for you.




Mooom, Mr. Larkin\'s trying to peer pressure me again. He say he\'s bad!


Peer?




Sometimes I find the best way to, say, get a friend a second opinion on
her car accident situation on the social media for example. Look at the
pictures. Say \"Sigh, yep, looks like $6000 worth of damage to me. Maybe
$7000. I think they\'re probably going to rule that a total loss..\"

then you wait a little bit. And another man (almost always a man) will
come around and say \"Nah idiot. That\'s no more than $3000 in damage.
Actually I worked for the insurance industry for 8 years and DO know
what I\'m talking about, unlike you.\"

\"No way that\'s not a total loss.\"

\"Oh I beg to differ!\"

\"There is definitely, no way, that you could provide an itemized
assessment of all the damage to that car and what you believe the repair
costs should be and have that on my friend\'s desk by tomorrow morning.\"

\"PFft! I could do it in my sleep.\" \"Oh yeah?\" \"Yeah, punk.\" \"OK. Well
get on it.\" \"Right. I\'ll show you.\"

I am studying managerial techniques


If your contribution to an electronic design forum is to tell
obviously intelligent people that they shouldn\'t try to design
electronics, management is your destiny. You can write long memos just
like the blather above.

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.



Pfft. No way you could design him a circuit like that by the weekend.
You ain\'t got the guts!

I do HV flybacks all the time. I\'ve posted several here. I\'ll sim and
build another one this week if my customer can decide what he really
needs.

I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

You wouldn\'t try it, would you? Do it. Post it.



Not particularly, as you say you\'re the man for the job. I\'m just
providing suitable encouragement. Can\'t wait to see it up and running on
a sheet of copper clad and your measurements on it - it\'s going to be great!

OK, you\'re not MAN enough to approach a thousand volts. Even in
simulation. You might get shocked and frightened and stuff. Post
Traumatic Spice Disorder.

Lol

If I do the HV pulser for this customer, I will certainly post pics.
I\'ve posted lots of such things before.

https://www.dropbox.com/sh/xvpt3fe4plq26nf/AADeGU747QNvKbcQVxU6a0vTa?dl=0

(The best are proprietary)

Well I hope you get compensated for your labor fairly. GL

 

[bitrex]

On 7/23/2020 1:40 PM, John Larkin wrote:

On Thu, 23 Jul 2020 12:53:57 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 12:31 PM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 12:00:45 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 11:37 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 11:14:20 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote:
On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 5:23 PM, John Larkin wrote:
On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:21 AM, George Herold wrote:
On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote:
I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter.

My specs are:
Input: 24-28V
Output voltage: 500-1000V adjustable via control signal
Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W)

I\'ve been reading through threads on different HV designs. So far the only one I\'ve come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ

There\'s also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don\'t know enough about making it adjustable and isolated.

Thoughts on how to proceed?

If you are going to try building it yourself, then I\'d start with the
500V 5 mA one first. I built my first flyback with the LT3083,

(2018... thread here
https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ

Good luck. Oh buying a ready made HV supply would be a good thing.
Gives you something to compare to if/when you have problems putting
to whole system together.

George H.


Yep. OP did not like that I disparaged/was skeptical of his plan to
build a 20 watt 1000 volt converter out of the gate but it strikes me as
a certain kind of madness as a first project if OP has not designed and
built a flyback of any type before.

Just different numbers. Shouldn\'t be really hard.


The Thor rocket was just sort of a scaled-up kerosene burning V2:

https://www.youtube.com/watch?v=WYrrVHPur2Y


OK, my bad. It would be really hard for you.




Mooom, Mr. Larkin\'s trying to peer pressure me again. He say he\'s bad!


Peer?




Sometimes I find the best way to, say, get a friend a second opinion on
her car accident situation on the social media for example. Look at the
pictures. Say \"Sigh, yep, looks like $6000 worth of damage to me. Maybe
$7000. I think they\'re probably going to rule that a total loss..\"

then you wait a little bit. And another man (almost always a man) will
come around and say \"Nah idiot. That\'s no more than $3000 in damage.
Actually I worked for the insurance industry for 8 years and DO know
what I\'m talking about, unlike you.\"

\"No way that\'s not a total loss.\"

\"Oh I beg to differ!\"

\"There is definitely, no way, that you could provide an itemized
assessment of all the damage to that car and what you believe the repair
costs should be and have that on my friend\'s desk by tomorrow morning.\"

\"PFft! I could do it in my sleep.\" \"Oh yeah?\" \"Yeah, punk.\" \"OK. Well
get on it.\" \"Right. I\'ll show you.\"

I am studying managerial techniques


If your contribution to an electronic design forum is to tell
obviously intelligent people that they shouldn\'t try to design
electronics, management is your destiny. You can write long memos just
like the blather above.

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.



Pfft. No way you could design him a circuit like that by the weekend.
You ain\'t got the guts!

I do HV flybacks all the time. I\'ve posted several here. I\'ll sim and
build another one this week if my customer can decide what he really
needs.

I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

You wouldn\'t try it, would you? Do it. Post it.



Not particularly, as you say you\'re the man for the job. I\'m just
providing suitable encouragement. Can\'t wait to see it up and running on
a sheet of copper clad and your measurements on it - it\'s going to be great!

OK, you\'re not MAN enough to approach a thousand volts. Even in
simulation. You might get shocked and frightened and stuff. Post
Traumatic Spice Disorder.

Lol

If I do the HV pulser for this customer, I will certainly post pics.
I\'ve posted lots of such things before.

https://www.dropbox.com/sh/xvpt3fe4plq26nf/AADeGU747QNvKbcQVxU6a0vTa?dl=0

(The best are proprietary)

Well I hope you get compensated for your labor fairly. GL

 

[George Herold]

On Thursday, July 23, 2020 at 1:14:32 PM UTC-4, Matt B wrote:

On Thursday, July 23, 2020 at 11:31:26 AM UTC-5, jla...@highlandsniptechnology.com wrote:
Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

I\'ll be taking you up on that offer. Hopefully I can get around to the design this weekend.

Awesome! I hope you\'ll share whatever pieces of the design here that
you can. A few milliamps at 1kV can be used for lots of things.
(I\'m a flyback tadpole.. so just lurking. :^)

George H.

On Thursday, July 23, 2020 at 11:54:02 AM UTC-5, bitrex wrote:
I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Fortunately I do know what I need. Your assumptions, insinuations and trolling throughout this thread is unwarranted. You are focused entirely too much on the bypass capacitors. The necessary information is that I have a load that needs 20W at 1000V.

 

[John Larkin]

On Thu, 23 Jul 2020 15:19:28 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 1:14 PM, Matt B wrote:
On Thursday, July 23, 2020 at 11:31:26 AM UTC-5, jla...@highlandsniptechnology.com wrote:
Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

I\'ll be taking you up on that offer. Hopefully I can get around to the design this weekend.


On Thursday, July 23, 2020 at 11:54:02 AM UTC-5, bitrex wrote:
I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Fortunately I do know what I need. Your assumptions, insinuations and trolling throughout this thread is unwarranted. You are focused entirely too much on the bypass capacitors. The necessary information is that I have a load that needs 20W at 1000V.


Look pal, if you want to learn about flyback converters, fine. If you
know exactly what you need and want it designed and built to your
precise spec consider hiring an engineer to do it. Or go to a Burger
King if you just want to give orders.

Screening out arrogant asses who don\'t even understand the (hazardous!)
circuits they\'re posting but want to play with even bigger toys is 100%
good policy. If someone else wants to take you on for free I\'m 100%
happy for them to do that.

He\'s sure not going to hire you. You are afraid of electricity.

That\'s OK. Lots of people are afraid of electricity.

 

[John Larkin]

On Thu, 23 Jul 2020 15:19:28 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 1:14 PM, Matt B wrote:
On Thursday, July 23, 2020 at 11:31:26 AM UTC-5, jla...@highlandsniptechnology.com wrote:
Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

I\'ll be taking you up on that offer. Hopefully I can get around to the design this weekend.


On Thursday, July 23, 2020 at 11:54:02 AM UTC-5, bitrex wrote:
I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Fortunately I do know what I need. Your assumptions, insinuations and trolling throughout this thread is unwarranted. You are focused entirely too much on the bypass capacitors. The necessary information is that I have a load that needs 20W at 1000V.


Look pal, if you want to learn about flyback converters, fine. If you
know exactly what you need and want it designed and built to your
precise spec consider hiring an engineer to do it. Or go to a Burger
King if you just want to give orders.

Screening out arrogant asses who don\'t even understand the (hazardous!)
circuits they\'re posting but want to play with even bigger toys is 100%
good policy. If someone else wants to take you on for free I\'m 100%
happy for them to do that.

He\'s sure not going to hire you. You are afraid of electricity.

That\'s OK. Lots of people are afraid of electricity.

 

[server]

On Thu, 23 Jul 2020 15:21:27 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 1:40 PM, John Larkin wrote:
On Thu, 23 Jul 2020 12:53:57 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 12:31 PM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 12:00:45 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 11:37 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 11:14:20 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote:
On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 5:23 PM, John Larkin wrote:
On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:21 AM, George Herold wrote:
On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote:
I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter.

My specs are:
Input: 24-28V
Output voltage: 500-1000V adjustable via control signal
Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W)

I\'ve been reading through threads on different HV designs. So far the only one I\'ve come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ

There\'s also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don\'t know enough about making it adjustable and isolated.

Thoughts on how to proceed?

If you are going to try building it yourself, then I\'d start with the
500V 5 mA one first. I built my first flyback with the LT3083,

(2018... thread here
https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ

Good luck. Oh buying a ready made HV supply would be a good thing.
Gives you something to compare to if/when you have problems putting
to whole system together.

George H.


Yep. OP did not like that I disparaged/was skeptical of his plan to
build a 20 watt 1000 volt converter out of the gate but it strikes me as
a certain kind of madness as a first project if OP has not designed and
built a flyback of any type before.

Just different numbers. Shouldn\'t be really hard.


The Thor rocket was just sort of a scaled-up kerosene burning V2:

https://www.youtube.com/watch?v=WYrrVHPur2Y


OK, my bad. It would be really hard for you.




Mooom, Mr. Larkin\'s trying to peer pressure me again. He say he\'s bad!


Peer?




Sometimes I find the best way to, say, get a friend a second opinion on
her car accident situation on the social media for example. Look at the
pictures. Say \"Sigh, yep, looks like $6000 worth of damage to me. Maybe
$7000. I think they\'re probably going to rule that a total loss..\"

then you wait a little bit. And another man (almost always a man) will
come around and say \"Nah idiot. That\'s no more than $3000 in damage.
Actually I worked for the insurance industry for 8 years and DO know
what I\'m talking about, unlike you.\"

\"No way that\'s not a total loss.\"

\"Oh I beg to differ!\"

\"There is definitely, no way, that you could provide an itemized
assessment of all the damage to that car and what you believe the repair
costs should be and have that on my friend\'s desk by tomorrow morning.\"

\"PFft! I could do it in my sleep.\" \"Oh yeah?\" \"Yeah, punk.\" \"OK. Well
get on it.\" \"Right. I\'ll show you.\"

I am studying managerial techniques


If your contribution to an electronic design forum is to tell
obviously intelligent people that they shouldn\'t try to design
electronics, management is your destiny. You can write long memos just
like the blather above.

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.



Pfft. No way you could design him a circuit like that by the weekend.
You ain\'t got the guts!

I do HV flybacks all the time. I\'ve posted several here. I\'ll sim and
build another one this week if my customer can decide what he really
needs.

I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

You wouldn\'t try it, would you? Do it. Post it.



Not particularly, as you say you\'re the man for the job. I\'m just
providing suitable encouragement. Can\'t wait to see it up and running on
a sheet of copper clad and your measurements on it - it\'s going to be great!

OK, you\'re not MAN enough to approach a thousand volts. Even in
simulation. You might get shocked and frightened and stuff. Post
Traumatic Spice Disorder.

Lol

If I do the HV pulser for this customer, I will certainly post pics.
I\'ve posted lots of such things before.

https://www.dropbox.com/sh/xvpt3fe4plq26nf/AADeGU747QNvKbcQVxU6a0vTa?dl=0

(The best are proprietary)



Well I hope you get compensated for your labor fairly. GL

Less than half the things that we design and build turn out to be
profitable. We bet too often on the success of our customers. And
sometimes on their honesty.

A minority of the projects pay the bills. Almost all are fun and
educational. So the trick to survival is to design a lot of stuff
fast.



--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[server]

On Thu, 23 Jul 2020 15:21:27 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 1:40 PM, John Larkin wrote:
On Thu, 23 Jul 2020 12:53:57 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 12:31 PM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 12:00:45 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 11:37 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 11:14:20 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote:
On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 5:23 PM, John Larkin wrote:
On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:21 AM, George Herold wrote:
On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote:
I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter.

My specs are:
Input: 24-28V
Output voltage: 500-1000V adjustable via control signal
Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W)

I\'ve been reading through threads on different HV designs. So far the only one I\'ve come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ

There\'s also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don\'t know enough about making it adjustable and isolated.

Thoughts on how to proceed?

If you are going to try building it yourself, then I\'d start with the
500V 5 mA one first. I built my first flyback with the LT3083,

(2018... thread here
https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ

Good luck. Oh buying a ready made HV supply would be a good thing.
Gives you something to compare to if/when you have problems putting
to whole system together.

George H.


Yep. OP did not like that I disparaged/was skeptical of his plan to
build a 20 watt 1000 volt converter out of the gate but it strikes me as
a certain kind of madness as a first project if OP has not designed and
built a flyback of any type before.

Just different numbers. Shouldn\'t be really hard.


The Thor rocket was just sort of a scaled-up kerosene burning V2:

https://www.youtube.com/watch?v=WYrrVHPur2Y


OK, my bad. It would be really hard for you.




Mooom, Mr. Larkin\'s trying to peer pressure me again. He say he\'s bad!


Peer?




Sometimes I find the best way to, say, get a friend a second opinion on
her car accident situation on the social media for example. Look at the
pictures. Say \"Sigh, yep, looks like $6000 worth of damage to me. Maybe
$7000. I think they\'re probably going to rule that a total loss..\"

then you wait a little bit. And another man (almost always a man) will
come around and say \"Nah idiot. That\'s no more than $3000 in damage.
Actually I worked for the insurance industry for 8 years and DO know
what I\'m talking about, unlike you.\"

\"No way that\'s not a total loss.\"

\"Oh I beg to differ!\"

\"There is definitely, no way, that you could provide an itemized
assessment of all the damage to that car and what you believe the repair
costs should be and have that on my friend\'s desk by tomorrow morning.\"

\"PFft! I could do it in my sleep.\" \"Oh yeah?\" \"Yeah, punk.\" \"OK. Well
get on it.\" \"Right. I\'ll show you.\"

I am studying managerial techniques


If your contribution to an electronic design forum is to tell
obviously intelligent people that they shouldn\'t try to design
electronics, management is your destiny. You can write long memos just
like the blather above.

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.



Pfft. No way you could design him a circuit like that by the weekend.
You ain\'t got the guts!

I do HV flybacks all the time. I\'ve posted several here. I\'ll sim and
build another one this week if my customer can decide what he really
needs.

I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

You wouldn\'t try it, would you? Do it. Post it.



Not particularly, as you say you\'re the man for the job. I\'m just
providing suitable encouragement. Can\'t wait to see it up and running on
a sheet of copper clad and your measurements on it - it\'s going to be great!

OK, you\'re not MAN enough to approach a thousand volts. Even in
simulation. You might get shocked and frightened and stuff. Post
Traumatic Spice Disorder.

Lol

If I do the HV pulser for this customer, I will certainly post pics.
I\'ve posted lots of such things before.

https://www.dropbox.com/sh/xvpt3fe4plq26nf/AADeGU747QNvKbcQVxU6a0vTa?dl=0

(The best are proprietary)



Well I hope you get compensated for your labor fairly. GL

Less than half the things that we design and build turn out to be
profitable. We bet too often on the success of our customers. And
sometimes on their honesty.

A minority of the projects pay the bills. Almost all are fun and
educational. So the trick to survival is to design a lot of stuff
fast.



--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[server]

On Thu, 23 Jul 2020 15:21:27 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 1:40 PM, John Larkin wrote:
On Thu, 23 Jul 2020 12:53:57 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 12:31 PM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 12:00:45 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 11:37 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 11:14:20 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote:
On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 5:23 PM, John Larkin wrote:
On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:21 AM, George Herold wrote:
On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote:
I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter.

My specs are:
Input: 24-28V
Output voltage: 500-1000V adjustable via control signal
Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W)

I\'ve been reading through threads on different HV designs. So far the only one I\'ve come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ

There\'s also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don\'t know enough about making it adjustable and isolated.

Thoughts on how to proceed?

If you are going to try building it yourself, then I\'d start with the
500V 5 mA one first. I built my first flyback with the LT3083,

(2018... thread here
https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ

Good luck. Oh buying a ready made HV supply would be a good thing.
Gives you something to compare to if/when you have problems putting
to whole system together.

George H.


Yep. OP did not like that I disparaged/was skeptical of his plan to
build a 20 watt 1000 volt converter out of the gate but it strikes me as
a certain kind of madness as a first project if OP has not designed and
built a flyback of any type before.

Just different numbers. Shouldn\'t be really hard.


The Thor rocket was just sort of a scaled-up kerosene burning V2:

https://www.youtube.com/watch?v=WYrrVHPur2Y


OK, my bad. It would be really hard for you.




Mooom, Mr. Larkin\'s trying to peer pressure me again. He say he\'s bad!


Peer?




Sometimes I find the best way to, say, get a friend a second opinion on
her car accident situation on the social media for example. Look at the
pictures. Say \"Sigh, yep, looks like $6000 worth of damage to me. Maybe
$7000. I think they\'re probably going to rule that a total loss..\"

then you wait a little bit. And another man (almost always a man) will
come around and say \"Nah idiot. That\'s no more than $3000 in damage.
Actually I worked for the insurance industry for 8 years and DO know
what I\'m talking about, unlike you.\"

\"No way that\'s not a total loss.\"

\"Oh I beg to differ!\"

\"There is definitely, no way, that you could provide an itemized
assessment of all the damage to that car and what you believe the repair
costs should be and have that on my friend\'s desk by tomorrow morning.\"

\"PFft! I could do it in my sleep.\" \"Oh yeah?\" \"Yeah, punk.\" \"OK. Well
get on it.\" \"Right. I\'ll show you.\"

I am studying managerial techniques


If your contribution to an electronic design forum is to tell
obviously intelligent people that they shouldn\'t try to design
electronics, management is your destiny. You can write long memos just
like the blather above.

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.



Pfft. No way you could design him a circuit like that by the weekend.
You ain\'t got the guts!

I do HV flybacks all the time. I\'ve posted several here. I\'ll sim and
build another one this week if my customer can decide what he really
needs.

I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

You wouldn\'t try it, would you? Do it. Post it.



Not particularly, as you say you\'re the man for the job. I\'m just
providing suitable encouragement. Can\'t wait to see it up and running on
a sheet of copper clad and your measurements on it - it\'s going to be great!

OK, you\'re not MAN enough to approach a thousand volts. Even in
simulation. You might get shocked and frightened and stuff. Post
Traumatic Spice Disorder.

Lol

If I do the HV pulser for this customer, I will certainly post pics.
I\'ve posted lots of such things before.

https://www.dropbox.com/sh/xvpt3fe4plq26nf/AADeGU747QNvKbcQVxU6a0vTa?dl=0

(The best are proprietary)



Well I hope you get compensated for your labor fairly. GL

Less than half the things that we design and build turn out to be
profitable. We bet too often on the success of our customers. And
sometimes on their honesty.

A minority of the projects pay the bills. Almost all are fun and
educational. So the trick to survival is to design a lot of stuff
fast.



--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[Bill Sloman]

On Friday, July 24, 2020 at 11:55:04 AM UTC+10, jla...@highlandsniptechnology.com wrote:

On Thu, 23 Jul 2020 15:21:27 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 1:40 PM, John Larkin wrote:
On Thu, 23 Jul 2020 12:53:57 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 12:31 PM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 12:00:45 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 11:37 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 11:14:20 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote:
On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 5:23 PM, John Larkin wrote:
On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:21 AM, George Herold wrote:
On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote:
I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter.

My specs are:
Input: 24-28V
Output voltage: 500-1000V adjustable via control signal
Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W)

I\'ve been reading through threads on different HV designs.. So far the only one I\'ve come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ

There\'s also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don\'t know enough about making it adjustable and isolated.

Thoughts on how to proceed?

If you are going to try building it yourself, then I\'d start with the
500V 5 mA one first. I built my first flyback with the LT3083,

(2018... thread here
https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ

Good luck. Oh buying a ready made HV supply would be a good thing.
Gives you something to compare to if/when you have problems putting
to whole system together.

George H.


Yep. OP did not like that I disparaged/was skeptical of his plan to
build a 20 watt 1000 volt converter out of the gate but it strikes me as
a certain kind of madness as a first project if OP has not designed and
built a flyback of any type before.

Just different numbers. Shouldn\'t be really hard.


The Thor rocket was just sort of a scaled-up kerosene burning V2:

https://www.youtube.com/watch?v=WYrrVHPur2Y


OK, my bad. It would be really hard for you.




Mooom, Mr. Larkin\'s trying to peer pressure me again. He say he\'s bad!


Peer?




Sometimes I find the best way to, say, get a friend a second opinion on
her car accident situation on the social media for example. Look at the
pictures. Say \"Sigh, yep, looks like $6000 worth of damage to me. Maybe
$7000. I think they\'re probably going to rule that a total loss..\"

then you wait a little bit. And another man (almost always a man) will
come around and say \"Nah idiot. That\'s no more than $3000 in damage.
Actually I worked for the insurance industry for 8 years and DO know
what I\'m talking about, unlike you.\"

\"No way that\'s not a total loss.\"

\"Oh I beg to differ!\"

\"There is definitely, no way, that you could provide an itemized
assessment of all the damage to that car and what you believe the repair
costs should be and have that on my friend\'s desk by tomorrow morning.\"

\"PFft! I could do it in my sleep.\" \"Oh yeah?\" \"Yeah, punk.\" \"OK. Well
get on it.\" \"Right. I\'ll show you.\"

I am studying managerial techniques


If your contribution to an electronic design forum is to tell
obviously intelligent people that they shouldn\'t try to design
electronics, management is your destiny. You can write long memos just
like the blather above.

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.



Pfft. No way you could design him a circuit like that by the weekend.
You ain\'t got the guts!

I do HV flybacks all the time. I\'ve posted several here. I\'ll sim and
build another one this week if my customer can decide what he really
needs.

I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

You wouldn\'t try it, would you? Do it. Post it.



Not particularly, as you say you\'re the man for the job. I\'m just
providing suitable encouragement. Can\'t wait to see it up and running on
a sheet of copper clad and your measurements on it - it\'s going to be great!

OK, you\'re not MAN enough to approach a thousand volts. Even in
simulation. You might get shocked and frightened and stuff. Post
Traumatic Spice Disorder.

Lol

If I do the HV pulser for this customer, I will certainly post pics.
I\'ve posted lots of such things before.

https://www.dropbox.com/sh/xvpt3fe4plq26nf/AADeGU747QNvKbcQVxU6a0vTa?dl=0

(The best are proprietary)



Well I hope you get compensated for your labor fairly. GL

Less than half the things that we design and build turn out to be
profitable. We bet too often on the success of our customers. And
sometimes on their honesty.

A minority of the projects pay the bills. Almost all are fun and
educational. So the trick to survival is to design a lot of stuff
fast.

It\'s one approach. In evolution, it is called the low investment, high volume, strategy.

If you design less stuff, and take long enough over it to do it well, you can survive on a different basis. The people I worked were selling complicated solutions to difficult problem, and if you didn\'t do it well, the product didn\'t work and couldn\'t be sold.

--
Bill Sloman, Sydney

 

[Bill Sloman]

On Friday, July 24, 2020 at 11:55:04 AM UTC+10, jla...@highlandsniptechnology.com wrote:

On Thu, 23 Jul 2020 15:21:27 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 1:40 PM, John Larkin wrote:
On Thu, 23 Jul 2020 12:53:57 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 12:31 PM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 12:00:45 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 11:37 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 11:14:20 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote:
On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 5:23 PM, John Larkin wrote:
On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:21 AM, George Herold wrote:
On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote:
I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter.

My specs are:
Input: 24-28V
Output voltage: 500-1000V adjustable via control signal
Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W)

I\'ve been reading through threads on different HV designs.. So far the only one I\'ve come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ

There\'s also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don\'t know enough about making it adjustable and isolated.

Thoughts on how to proceed?

If you are going to try building it yourself, then I\'d start with the
500V 5 mA one first. I built my first flyback with the LT3083,

(2018... thread here
https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ

Good luck. Oh buying a ready made HV supply would be a good thing.
Gives you something to compare to if/when you have problems putting
to whole system together.

George H.


Yep. OP did not like that I disparaged/was skeptical of his plan to
build a 20 watt 1000 volt converter out of the gate but it strikes me as
a certain kind of madness as a first project if OP has not designed and
built a flyback of any type before.

Just different numbers. Shouldn\'t be really hard.


The Thor rocket was just sort of a scaled-up kerosene burning V2:

https://www.youtube.com/watch?v=WYrrVHPur2Y


OK, my bad. It would be really hard for you.




Mooom, Mr. Larkin\'s trying to peer pressure me again. He say he\'s bad!


Peer?




Sometimes I find the best way to, say, get a friend a second opinion on
her car accident situation on the social media for example. Look at the
pictures. Say \"Sigh, yep, looks like $6000 worth of damage to me. Maybe
$7000. I think they\'re probably going to rule that a total loss..\"

then you wait a little bit. And another man (almost always a man) will
come around and say \"Nah idiot. That\'s no more than $3000 in damage.
Actually I worked for the insurance industry for 8 years and DO know
what I\'m talking about, unlike you.\"

\"No way that\'s not a total loss.\"

\"Oh I beg to differ!\"

\"There is definitely, no way, that you could provide an itemized
assessment of all the damage to that car and what you believe the repair
costs should be and have that on my friend\'s desk by tomorrow morning.\"

\"PFft! I could do it in my sleep.\" \"Oh yeah?\" \"Yeah, punk.\" \"OK. Well
get on it.\" \"Right. I\'ll show you.\"

I am studying managerial techniques


If your contribution to an electronic design forum is to tell
obviously intelligent people that they shouldn\'t try to design
electronics, management is your destiny. You can write long memos just
like the blather above.

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.



Pfft. No way you could design him a circuit like that by the weekend.
You ain\'t got the guts!

I do HV flybacks all the time. I\'ve posted several here. I\'ll sim and
build another one this week if my customer can decide what he really
needs.

I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

You wouldn\'t try it, would you? Do it. Post it.



Not particularly, as you say you\'re the man for the job. I\'m just
providing suitable encouragement. Can\'t wait to see it up and running on
a sheet of copper clad and your measurements on it - it\'s going to be great!

OK, you\'re not MAN enough to approach a thousand volts. Even in
simulation. You might get shocked and frightened and stuff. Post
Traumatic Spice Disorder.

Lol

If I do the HV pulser for this customer, I will certainly post pics.
I\'ve posted lots of such things before.

https://www.dropbox.com/sh/xvpt3fe4plq26nf/AADeGU747QNvKbcQVxU6a0vTa?dl=0

(The best are proprietary)



Well I hope you get compensated for your labor fairly. GL

Less than half the things that we design and build turn out to be
profitable. We bet too often on the success of our customers. And
sometimes on their honesty.

A minority of the projects pay the bills. Almost all are fun and
educational. So the trick to survival is to design a lot of stuff
fast.

It\'s one approach. In evolution, it is called the low investment, high volume, strategy.

If you design less stuff, and take long enough over it to do it well, you can survive on a different basis. The people I worked were selling complicated solutions to difficult problem, and if you didn\'t do it well, the product didn\'t work and couldn\'t be sold.

--
Bill Sloman, Sydney

 

[Bill Sloman]

On Friday, July 24, 2020 at 11:55:04 AM UTC+10, jla...@highlandsniptechnology.com wrote:

On Thu, 23 Jul 2020 15:21:27 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 1:40 PM, John Larkin wrote:
On Thu, 23 Jul 2020 12:53:57 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 12:31 PM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 12:00:45 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 11:37 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 11:14:20 -0400, bitrex <user@example.net> wrote:

On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote:
On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote:
On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 5:23 PM, John Larkin wrote:
On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote:

On 7/22/2020 10:21 AM, George Herold wrote:
On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote:
I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter.

My specs are:
Input: 24-28V
Output voltage: 500-1000V adjustable via control signal
Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W)

I\'ve been reading through threads on different HV designs.. So far the only one I\'ve come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ

There\'s also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don\'t know enough about making it adjustable and isolated.

Thoughts on how to proceed?

If you are going to try building it yourself, then I\'d start with the
500V 5 mA one first. I built my first flyback with the LT3083,

(2018... thread here
https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ

Good luck. Oh buying a ready made HV supply would be a good thing.
Gives you something to compare to if/when you have problems putting
to whole system together.

George H.


Yep. OP did not like that I disparaged/was skeptical of his plan to
build a 20 watt 1000 volt converter out of the gate but it strikes me as
a certain kind of madness as a first project if OP has not designed and
built a flyback of any type before.

Just different numbers. Shouldn\'t be really hard.


The Thor rocket was just sort of a scaled-up kerosene burning V2:

https://www.youtube.com/watch?v=WYrrVHPur2Y


OK, my bad. It would be really hard for you.




Mooom, Mr. Larkin\'s trying to peer pressure me again. He say he\'s bad!


Peer?




Sometimes I find the best way to, say, get a friend a second opinion on
her car accident situation on the social media for example. Look at the
pictures. Say \"Sigh, yep, looks like $6000 worth of damage to me. Maybe
$7000. I think they\'re probably going to rule that a total loss..\"

then you wait a little bit. And another man (almost always a man) will
come around and say \"Nah idiot. That\'s no more than $3000 in damage.
Actually I worked for the insurance industry for 8 years and DO know
what I\'m talking about, unlike you.\"

\"No way that\'s not a total loss.\"

\"Oh I beg to differ!\"

\"There is definitely, no way, that you could provide an itemized
assessment of all the damage to that car and what you believe the repair
costs should be and have that on my friend\'s desk by tomorrow morning.\"

\"PFft! I could do it in my sleep.\" \"Oh yeah?\" \"Yeah, punk.\" \"OK. Well
get on it.\" \"Right. I\'ll show you.\"

I am studying managerial techniques


If your contribution to an electronic design forum is to tell
obviously intelligent people that they shouldn\'t try to design
electronics, management is your destiny. You can write long memos just
like the blather above.

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.



Pfft. No way you could design him a circuit like that by the weekend.
You ain\'t got the guts!

I do HV flybacks all the time. I\'ve posted several here. I\'ll sim and
build another one this week if my customer can decide what he really
needs.

I\'m not entirely convinced OP knows what he needs either, charging up a
5uF cap bank to 1kV for a piezo driver? sure love to know what the
application is.

Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

You wouldn\'t try it, would you? Do it. Post it.



Not particularly, as you say you\'re the man for the job. I\'m just
providing suitable encouragement. Can\'t wait to see it up and running on
a sheet of copper clad and your measurements on it - it\'s going to be great!

OK, you\'re not MAN enough to approach a thousand volts. Even in
simulation. You might get shocked and frightened and stuff. Post
Traumatic Spice Disorder.

Lol

If I do the HV pulser for this customer, I will certainly post pics.
I\'ve posted lots of such things before.

https://www.dropbox.com/sh/xvpt3fe4plq26nf/AADeGU747QNvKbcQVxU6a0vTa?dl=0

(The best are proprietary)



Well I hope you get compensated for your labor fairly. GL

Less than half the things that we design and build turn out to be
profitable. We bet too often on the success of our customers. And
sometimes on their honesty.

A minority of the projects pay the bills. Almost all are fun and
educational. So the trick to survival is to design a lot of stuff
fast.

It\'s one approach. In evolution, it is called the low investment, high volume, strategy.

If you design less stuff, and take long enough over it to do it well, you can survive on a different basis. The people I worked were selling complicated solutions to difficult problem, and if you didn\'t do it well, the product didn\'t work and couldn\'t be sold.

--
Bill Sloman, Sydney

 

[Jan Panteltje]

On a sunny day (Thu, 23 Jul 2020 08:37:36 -0700) it happened
jlarkin@highlandsniptechnology.com wrote in
<37bjhftbjdbtlm8uelm5jqlci6p5jrht7u@4ax.com>:

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.

You could probably re-purpose an old CRT transistor color TV or monitor:
1.5 mA at 25kV is 37.5 W.
Remove HV coil from EI transformer.
Remove scan coils, those are about 440Vpp IIRC??
Use that winding, 1 x voltage doubling, 2 diodes.
Designing and building from junk box is fun
I once triggered a BU208 from an UJT to generate H scan and HV.
Play around a bit.

 

[Jan Panteltje]

On a sunny day (Thu, 23 Jul 2020 08:37:36 -0700) it happened
jlarkin@highlandsniptechnology.com wrote in
<37bjhftbjdbtlm8uelm5jqlci6p5jrht7u@4ax.com>:

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.

You could probably re-purpose an old CRT transistor color TV or monitor:
1.5 mA at 25kV is 37.5 W.
Remove HV coil from EI transformer.
Remove scan coils, those are about 440Vpp IIRC??
Use that winding, 1 x voltage doubling, 2 diodes.
Designing and building from junk box is fun
I once triggered a BU208 from an UJT to generate H scan and HV.
Play around a bit.

 

[Jan Panteltje]

On a sunny day (Thu, 23 Jul 2020 08:37:36 -0700) it happened
jlarkin@highlandsniptechnology.com wrote in
<37bjhftbjdbtlm8uelm5jqlci6p5jrht7u@4ax.com>:

A 1KV, 20 watt flyback wouldn\'t be difficult, except to people who are
afraid to do it.

You could probably re-purpose an old CRT transistor color TV or monitor:
1.5 mA at 25kV is 37.5 W.
Remove HV coil from EI transformer.
Remove scan coils, those are about 440Vpp IIRC??
Use that winding, 1 x voltage doubling, 2 diodes.
Designing and building from junk box is fun
I once triggered a BU208 from an UJT to generate H scan and HV.
Play around a bit.

 

[Jan Panteltje]

On a sunny day (Thu, 23 Jul 2020 11:38:47 -0700) it happened John Larkin
<jlarkin@highland_atwork_technology.com> wrote in
<53mjhflf6tdbcmff4ctlcts6tdsoqh93t2@4ax.com>:

On Thu, 23 Jul 2020 10:14:28 -0700 (PDT), Matt B
matt.blessinger@gmail.com> wrote:

On Thursday, July 23, 2020 at 11:31:26 AM UTC-5, jla...@highlandsniptechnology.com wrote:
Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

I\'ll be taking you up on that offer. Hopefully I can get around to the design this weekend.


Cool. Group designs are fun. We rarely do that here.

You\'ll need a model of the transformer, magnetizing and leakage
inductance and maybe some capacitances. Those are easy to approximate.

Yes
1 volt per turn
For 24V DC in 24 turns primary
Flyback voltage about 5 x 24 say 100V for simple-city.
So secundary for 1000V is 10 x 24 = 240 turns.
Look up wire diameter for currents.
Look up EI core for 30 W or so.
Use 16 kHz or a bit higher for switching frequency.

Transistor, flyback diode, MVB? pulse witdth feedback for stabilization
for example.

Spice? I use lost of Chili

 

[Jan Panteltje]

On a sunny day (Thu, 23 Jul 2020 11:38:47 -0700) it happened John Larkin
<jlarkin@highland_atwork_technology.com> wrote in
<53mjhflf6tdbcmff4ctlcts6tdsoqh93t2@4ax.com>:

On Thu, 23 Jul 2020 10:14:28 -0700 (PDT), Matt B
matt.blessinger@gmail.com> wrote:

On Thursday, July 23, 2020 at 11:31:26 AM UTC-5, jla...@highlandsniptechnology.com wrote:
Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

I\'ll be taking you up on that offer. Hopefully I can get around to the design this weekend.


Cool. Group designs are fun. We rarely do that here.

You\'ll need a model of the transformer, magnetizing and leakage
inductance and maybe some capacitances. Those are easy to approximate.

Yes
1 volt per turn
For 24V DC in 24 turns primary
Flyback voltage about 5 x 24 say 100V for simple-city.
So secundary for 1000V is 10 x 24 = 240 turns.
Look up wire diameter for currents.
Look up EI core for 30 W or so.
Use 16 kHz or a bit higher for switching frequency.

Transistor, flyback diode, MVB? pulse witdth feedback for stabilization
for example.

Spice? I use lost of Chili

 

[Jan Panteltje]

On a sunny day (Thu, 23 Jul 2020 11:38:47 -0700) it happened John Larkin
<jlarkin@highland_atwork_technology.com> wrote in
<53mjhflf6tdbcmff4ctlcts6tdsoqh93t2@4ax.com>:

On Thu, 23 Jul 2020 10:14:28 -0700 (PDT), Matt B
matt.blessinger@gmail.com> wrote:

On Thursday, July 23, 2020 at 11:31:26 AM UTC-5, jla...@highlandsniptechnology.com wrote:
Any decent analog designer could Spice this in an houror two; I could
do it in 20 minutes, but I\'m familiar with the part. All of the LT3083
boosts and flybacks that I\'ve simulated have worked as expected. My
only problem has been inductor heating, which won\'t be an issue here
with the recommended transformer.

If he wants to scribble or Spice a circuit, I offered to help. I\'m
sure MPS would help too.

I\'ll be taking you up on that offer. Hopefully I can get around to the design this weekend.


Cool. Group designs are fun. We rarely do that here.

You\'ll need a model of the transformer, magnetizing and leakage
inductance and maybe some capacitances. Those are easy to approximate.

Yes
1 volt per turn
For 24V DC in 24 turns primary
Flyback voltage about 5 x 24 say 100V for simple-city.
So secundary for 1000V is 10 x 24 = 240 turns.
Look up wire diameter for currents.
Look up EI core for 30 W or so.
Use 16 kHz or a bit higher for switching frequency.

Transistor, flyback diode, MVB? pulse witdth feedback for stabilization
for example.

Spice? I use lost of Chili