feedback with isolation galvanic

[Naoufel Elkhayati]

Hi.
I need to realise my power supply with adjustable output voltage 0-30v with current lower than 30A with response time 1ms

So after a lot of research, I choose to use push-pull dc-dc convert and now I work about the voltage feedback .I need to control the voltage between 0 and 30v with a microcontroller so you should use an isolation galvanic .can you give me some solution for this problem? How can I used inductance to have the image of output voltage like this image? And if you have any other solution please share it with me

**broken link removed**

 

[chuckey]

if you use a voltage to frequency converter with an off set. So 0V = 1 KHZ and 30 V = 31 KHZ. Your transformer then deals with 1 to 31 KHZ.
Frank

 

[FvM]

The popular isolation method used in most switched mode supplies is opto coupler.

A standard opto coupler can transmit the analog feedback signal over the isolation barrier, but it doesn't provide stable gain or offset. The solution is to generate the voltage and/or current setpoint on the secondary side, do the comparison and feed it to a PI controller. Then transmit the error signal trough the opto coupler. By working of the PI controller, opto coupler gain and offset variations are cancelled.