Continuously Variable AC-DC Power Supply Design

[kvaghela]

Hi,

I need to design continuously variable (variation needs to be controlled digitally using micro-controller) power supply which can provide 1-20 V DC and AC @ 8-10A (shared between AC and DC out). I have some limitation on form-factor of design so I have very limited scope to use 1-20V seconday variac due to it's size.
Could anyone please suggest me what way I should go?

Thanks in advance!
-KV

 

[thannara123]

See these link
**broken link removed**
https://www.edaboard.com/threads/5842/

 

[leo_o2]

Specicially designed IC should be employed to do this.

 

[kvaghela]

See these link
**broken link removed**
https://www.edaboard.com/threads/5842/

Thanks thannara for links.

Specicially designed IC should be employed to do this.

Leo, would you please help me know what type of specially designed IC you want me to employ?

 

[leo_o2]

I means you possibly can't find a general-purpose IC for this now. Pls ask a IC company to customize one for you.

 

[kvaghela]

Thanks for the suggestion LEO, but that could be very expensive for me.
I have designed one PSU which has multiple tapping toroidal tranformer (230V primary/ 0,5 to 17V secondary @ 8A), can I use that transformer and SOMETHING to fine tune voltages in steps of 100mV? e.g I am using 5 and 6 V tapping to output 1V AC, 5 and 7 for 2VAC, and so on, now I need some mechanism to between 1V step to provide resolution of 100mV.