Design a Voltage Feedback Loop w/ PID Controller

[Kasim]

Hi

Can anybody tell me where to put a PID controller in the picture below to design a voltage feedbaxk loop?

Thanks

 

[jim hardy]

Between line VC and the pulse generator.
Difference between measured and desired VC is error , function PID(error) controls pulse width.

 

[Kasim]

Thanks jim.

Would the picture below be correct

 

[jim hardy]

I'd connect top of PID to left side of pulse generator, to represent controlling pulse generator's input, instead of where you have it which is its output .
And i'd add arrowheads to PID so it's intuitive that bottom is PID input and top is output.
Likewise add arrowheads to pulse generator.

The point is you let PID control the pulse width to make correct average voltage over at VC.. That's the basis of feedback control - continually measure , compare, adjust.

 

[Kasim]

Hi Jim

Would this be ok, sorry for bothering you

 

[jim hardy]

Would this be ok,

Your most recent addition looks right , but now you have two PID's.
Erase that first one you drew and it could work.

 

[Kasim]

Yeah was just a rough sketch.. Thanks a lot

 

[jim hardy]

Good luck!