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

M

Matt B

Guest
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?
 
On Tue, 21 Jul 2020 15:51:44 -0700 (PDT), Matt B
<matt.blessinger@gmail.com> 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?
Click to expand...

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers
 
On Tue, 21 Jul 2020 15:51:44 -0700 (PDT), Matt B
<matt.blessinger@gmail.com> 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?
Click to expand...

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers
 
On 7/21/2020 7:01 PM, John Larkin wrote:
On Tue, 21 Jul 2020 15:51:44 -0700 (PDT), Matt B
matt.blessinger@gmail.com> 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?

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers
Click to expand...

Someday all the guys who show up every couple of months out of nowhere
looking for plans on how to build their own handheld electric
zapper-taser will come to terms with the fact that it\'s one of the more
useless \"weapons\" for just about any purpose there is.

Might as well put it in a heavy enclosure and then bop your enemy on the
head with it.
 
On 7/21/2020 7:01 PM, John Larkin wrote:
On Tue, 21 Jul 2020 15:51:44 -0700 (PDT), Matt B
matt.blessinger@gmail.com> 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?

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers
Click to expand...

Someday all the guys who show up every couple of months out of nowhere
looking for plans on how to build their own handheld electric
zapper-taser will come to terms with the fact that it\'s one of the more
useless \"weapons\" for just about any purpose there is.

Might as well put it in a heavy enclosure and then bop your enemy on the
head with it.
 
On 7/21/2020 7:01 PM, John Larkin wrote:
On Tue, 21 Jul 2020 15:51:44 -0700 (PDT), Matt B
matt.blessinger@gmail.com> 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?

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers
Click to expand...

Someday all the guys who show up every couple of months out of nowhere
looking for plans on how to build their own handheld electric
zapper-taser will come to terms with the fact that it\'s one of the more
useless \"weapons\" for just about any purpose there is.

Might as well put it in a heavy enclosure and then bop your enemy on the
head with it.
 
On Tuesday, July 21, 2020 at 6:02:06 PM UTC-5, John Larkin wrote:
Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers
Click to expand...

Thanks! That\'s a good start for a replacement transformer.
 
On Tuesday, July 21, 2020 at 6:02:06 PM UTC-5, John Larkin wrote:
Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers
Click to expand...

Thanks! That\'s a good start for a replacement transformer.
 
On Tuesday, July 21, 2020 at 10:03:58 PM UTC-5, bitrex wrote:
On 7/21/2020 7:01 PM, John Larkin wrote:
On Tue, 21 Jul 2020 15:51:44 -0700 (PDT), Matt B


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?

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers




Someday all the guys who show up every couple of months out of nowhere
looking for plans on how to build their own handheld electric
zapper-taser will come to terms with the fact that it\'s one of the more
useless \"weapons\" for just about any purpose there is.

Might as well put it in a heavy enclosure and then bop your enemy on the
head with it.
Click to expand...

Sigh... it\'s for a piezo stack. I\'ve seen you comment on other HV PSU threads. Do you have any insight for a good isolated design?
 
On Tuesday, July 21, 2020 at 10:03:58 PM UTC-5, bitrex wrote:
On 7/21/2020 7:01 PM, John Larkin wrote:
On Tue, 21 Jul 2020 15:51:44 -0700 (PDT), Matt B


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?

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers




Someday all the guys who show up every couple of months out of nowhere
looking for plans on how to build their own handheld electric
zapper-taser will come to terms with the fact that it\'s one of the more
useless \"weapons\" for just about any purpose there is.

Might as well put it in a heavy enclosure and then bop your enemy on the
head with it.
Click to expand...

Sigh... it\'s for a piezo stack. I\'ve seen you comment on other HV PSU threads. Do you have any insight for a good isolated design?
 
On Tuesday, July 21, 2020 at 6:02:06 PM UTC-5, John Larkin wrote:
Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers
Click to expand...

Thanks! That\'s a good start for a replacement transformer.
 
On Tue, 21 Jul 2020 20:22:28 -0700 (PDT), Matt B
<matt.blessinger@gmail.com> wrote:

On Tuesday, July 21, 2020 at 6:02:06 PM UTC-5, John Larkin wrote:

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers

Thanks! That\'s a good start for a replacement transformer.
Click to expand...

I you want to design the whole circuit, take a look at LT3803 and its
app notes. It just always seems to work.

Scribble some circuits and we can talk about them. LT Spice includes
the 3803 too. It seems to work just like it simulates.





--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard
 
On Tue, 21 Jul 2020 20:22:28 -0700 (PDT), Matt B
<matt.blessinger@gmail.com> wrote:

On Tuesday, July 21, 2020 at 6:02:06 PM UTC-5, John Larkin wrote:

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers

Thanks! That\'s a good start for a replacement transformer.
Click to expand...

I you want to design the whole circuit, take a look at LT3803 and its
app notes. It just always seems to work.

Scribble some circuits and we can talk about them. LT Spice includes
the 3803 too. It seems to work just like it simulates.





--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard
 
On Wednesday, July 22, 2020 at 8:51:49 AM UTC+10, 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?
Click to expand...

http://www.sophia-electronica.com/Baxandall_parallel-resonant_Class-D_oscillator1.htm

has a circuit for a high-voltage output inverter at the bottom of the page, which relies on pulse with modulation to adjust the output voltage.

It\'s strictly an LTSpice simulation, the output voltage goes higher than you need, and the power levels are for biasing a photomultiplier tube and lower than you want.

A bigger transformer, with room for thicker wire would fix most of that - you would also need a higher voltage MOSFET switch - 24V into the centre tap of a Baxanadall class oscillator produces a 75.4V peak half-sine across the MOSFET that is off, and the AP9465GEM is only good for 40V.

The NXP BUK9Y72-80E might do.

http://www.farnell.com/datasheets/1705544.pdf

--
Bill Sloman, Sydney
 
On Wednesday, July 22, 2020 at 8:51:49 AM UTC+10, 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?
Click to expand...

http://www.sophia-electronica.com/Baxandall_parallel-resonant_Class-D_oscillator1.htm

has a circuit for a high-voltage output inverter at the bottom of the page, which relies on pulse with modulation to adjust the output voltage.

It\'s strictly an LTSpice simulation, the output voltage goes higher than you need, and the power levels are for biasing a photomultiplier tube and lower than you want.

A bigger transformer, with room for thicker wire would fix most of that - you would also need a higher voltage MOSFET switch - 24V into the centre tap of a Baxanadall class oscillator produces a 75.4V peak half-sine across the MOSFET that is off, and the AP9465GEM is only good for 40V.

The NXP BUK9Y72-80E might do.

http://www.farnell.com/datasheets/1705544.pdf

--
Bill Sloman, Sydney
 
On Tue, 21 Jul 2020 20:22:28 -0700 (PDT), Matt B
<matt.blessinger@gmail.com> wrote:

On Tuesday, July 21, 2020 at 6:02:06 PM UTC-5, John Larkin wrote:

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers

Thanks! That\'s a good start for a replacement transformer.
Click to expand...

I you want to design the whole circuit, take a look at LT3803 and its
app notes. It just always seems to work.

Scribble some circuits and we can talk about them. LT Spice includes
the 3803 too. It seems to work just like it simulates.





--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard
 
On 7/21/2020 11:24 PM, Matt B wrote:
On Tuesday, July 21, 2020 at 10:03:58 PM UTC-5, bitrex wrote:
On 7/21/2020 7:01 PM, John Larkin wrote:
On Tue, 21 Jul 2020 15:51:44 -0700 (PDT), Matt B


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?

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers




Someday all the guys who show up every couple of months out of nowhere
looking for plans on how to build their own handheld electric
zapper-taser will come to terms with the fact that it\'s one of the more
useless \"weapons\" for just about any purpose there is.

Might as well put it in a heavy enclosure and then bop your enemy on the
head with it.

Sigh... it\'s for a piezo stack. I\'ve seen you comment on other HV PSU threads. Do you have any insight for a good isolated design?
Click to expand...

Yeah you make it adjustable and isolated more or less the same way you
make any other flyback converter adjustable and isolated. You\'ve
designed and built a flyback before, right?
 
On 7/21/2020 11:24 PM, Matt B wrote:
On Tuesday, July 21, 2020 at 10:03:58 PM UTC-5, bitrex wrote:
On 7/21/2020 7:01 PM, John Larkin wrote:
On Tue, 21 Jul 2020 15:51:44 -0700 (PDT), Matt B


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?

Take a look at these maybe:

https://magnetic-components.mpsind.com/viewitems/flyback-transformers/p3800-series-isolated-flyback-transformers




Someday all the guys who show up every couple of months out of nowhere
looking for plans on how to build their own handheld electric
zapper-taser will come to terms with the fact that it\'s one of the more
useless \"weapons\" for just about any purpose there is.

Might as well put it in a heavy enclosure and then bop your enemy on the
head with it.

Sigh... it\'s for a piezo stack. I\'ve seen you comment on other HV PSU threads. Do you have any insight for a good isolated design?
Click to expand...

Yeah you make it adjustable and isolated more or less the same way you
make any other flyback converter adjustable and isolated. You\'ve
designed and built a flyback before, right?
 
Matt B <matt.blessinger@gmail.com> writes:

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)
Click to expand...

If this is a one-off or a few pieces, how about Ultravolt 1C24-N20 ?
We used that (actually positive version) to start a product line and later
designed a custom one.

In our case, we needed robust short circuit protection and cap charging,
which required some knowledge in the flyback control loop - mostly
reduced frequency for low end voltage. Other items to take care of were
correct snubbering and resistor chains to deal with 1kV on SMD. And
discharging on powerdown to avoid accidents!

Transformer is a custom one with 4 HV sections and a 2-turn foil primary
around them for down to 14V operation. Each HV section was rectified to
a cap and the DC was in series.

--
mikko
 
Matt B <matt.blessinger@gmail.com> writes:

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)
Click to expand...

If this is a one-off or a few pieces, how about Ultravolt 1C24-N20 ?
We used that (actually positive version) to start a product line and later
designed a custom one.

In our case, we needed robust short circuit protection and cap charging,
which required some knowledge in the flyback control loop - mostly
reduced frequency for low end voltage. Other items to take care of were
correct snubbering and resistor chains to deal with 1kV on SMD. And
discharging on powerdown to avoid accidents!

Transformer is a custom one with 4 HV sections and a 2-turn foil primary
around them for down to 14V operation. Each HV section was rectified to
a cap and the DC was in series.

--
mikko
 
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