Design a flyback transformer for charging defibrillator

[swathy]

how can i design a flyback transformer for the controlled charging of defibrillator capacitor(high voltage). The charging is controlled using PWM which controls the transformer switching using a MOSFET.

 

[berkeman]

how can i design a flyback transformer for the controlled charging of defibrillator capacitor(high voltage). The charging is controlled using PWM which controls the transformer switching using a MOSFET.

Welcome to the PF.

It looks like the paper you attached has a pretty good explanation for your question. Have you read it? Is there some part that you do not understand? Is this for schoolwork?

 

[sophiecentaur]

Sorry to be a pain here but is this project aimed ant actually building something? If it is, then you need to be under the direction of someone who is competent to handle very high voltages. By their very nature, Defib Capacitors store enough energy to kill you. I'm not sure what the Mods would think about this? eh, berkeman?

 

[berkeman]

eh, berkeman?

 

[dlgoff]

By their very nature, Defib Capacitors store enough energy to kill you.

Yep. And it's mentioned on page 4.

CAUTION: The charged capacitor used in the example can
provide a LETHAL shock.

 

[jim hardy]

how can i design a flyback transformer ...

That paper stops short of designing the actual transformer.

The Devil is always in the Details. You've got to pick a core and figure out how much wire to wind onto it.

TI has a guide here
https://www.ti.com/lit/ml/slup127/slup127.pdf

core manufacturers have design guides but they tend to be cryptic because the folks who write them are so experienced they have difficulty making their shorthand easy for beginners to grasp.
Magnetics Inc is an old line supplier with an extensive library.
take a look here
https://www.mag-inc.com/Design/Selection-Guide
https://www.mag-inc.com/Design/Design-Guides/Transformer-Design-with-Magnetics-Ferrite-Cores
https://www.mag-inc.com/getattachme...oductDistributionChartWaAc2012.pdf?lang=en-US

hope that gets you started.

Coilcraft has design tools that help you pick one of their standard transformers.
http://www.coilcraft.com/transformsel.cfm
http://www.coilcraft.com/prod_cap_charger.cfm

old jim

 

[sophiecentaur]

Yep. And it's mentioned on page 4.

Safety / danger would probably also be mentioned in paper on using TNT but PF would still urge caution and probably distance itself from too much discussion. I think it's in the rules.

 

[berkeman]

The OP has not been back in almost a week, so I'll go ahead and close the thread for now. @swathy -- send me a Private Message if you would like this thread re-opened for discussion.