Hi All,
i need 5-6 v , 80-90 amper AC power , although i can use step down transformer of mains 50/60 hz , it is so bulky and heavy , 400 w such transformer weighs almost 3.5 kg , i need lighter and small
output , not must be sinusoidal ,
any idea ? pls help

 

https://www.jameco.com/shop/keyword=5-Volt-100-Amp-Power-Supply

 

That is a lot of watts. What is the application?

Are you looking to build or find an off-the-shelf solution?

Are square waves acceptable?

Is efficiency critical?

Is this one-off or will it go into production?

 

Do you want to use AC as the output at 80Amps?

 

That is a lot of watts. What is the application?

Are you looking to build or find an off-the-shelf solution?

Are square waves acceptable?

Is efficiency critical?

Is this one-off or will it go into production?

application is heating , that is why output waves are not crucial , square waves are acceptable
of course , more efficiency is better , up 85 %
i prefer ready made off-the-shelf solution ,

 

That's a relief (that you want ready-made).

Can you use the DC power supply mentioned by Ramussons in post #2?

 

Do you want to use AC as the output at 80Amps?

yes

 

That's a relief (that you want ready-made).

Can you use the DC power supply mentioned by Ramussons in post #2?

that is not relief , for thousand pieces of ready made ! and AC is preferable , because i need smaller and lighter PS , needs to eliminating bulky filtering caps and rectifiers

 

Why can't you use a mains voltage heating element?

 

Why can't you use a mains voltage heating element?

it is not regular resistive heating element

 

it is not regular resistive heating element

What is it?

 

my opinion is : half-bridge SMPS configuration without final rectifier and capacitors .
but , no idea of finding high frequency transformer with such high current output

 

What are you using for heating elements, and what temperature range, as this can determine the voltage?

 

Obviously not Peltier, because they need DC.

 

What are you using for heating elements, and what temperature range, as this can determine the voltage?

For example, I used sophisticate bended stainless steel knife, heated by 60kHz low voltage, high current, transformer,
for cutting fancy things from plastic sheet.
ADDED:

Hi All,
i need 5-6 v , 80-90 amper AC power , although i can use step down transformer of mains 50/60 hz , it is so bulky and heavy , 400 w such transformer weighs almost 3.5 kg , i need lighter and small
output , not must be sinusoidal ,
any idea ? pls help

As power source I used electronic transformer, like THIS.

Inside electronic transformer:

https://cxem.net/pitanie/5-346.php

 

For example, I used sophisticate bended stainless steel knife, heated by 60kHz low voltage, high current, transformer,
for cutting fancy things from plastic sheet.
ADDED:

As power source I used electronic transformer, like THIS.
View attachment 265395
Inside electronic transformer:
View attachment 265386View attachment 265387
https://cxem.net/pitanie/5-346.php

Thank you Danko , for very useful advice of a solution , any info of electronic transformer with higher power than 300w ? like 400-500 w.
And for the step down ferrite ring , would you pls advise on sizes of toroid core and number of turns to fit its power capacity

 

any info of electronic transformer with higher power than 300w ? like 400-500 w.

I did not see any information about electronic transformer with power more than 300 W.
But, as mentioned in this article, electronic transformers are able normally work
with load power up to 150% of nominal.

And for the step down ferrite ring , would you pls advise on sizes of toroid core and number of turns to fit its power capacity

1. Use some online calculator, like this: http://dicks-website.eu/coilcalculator/
Or
2. Depends on your qualification, you easily can replace 12 V winding on ferrite ring
inside electronic transformer with required 5 V winding (few turns).