I have a buck converter and ı should give an input DC 200 V and the output shoud be 72 V.
How can ı set a voltage 72V at the output of this buck converter?
Is there any ratio code? I sent the calculations and netlist file

 

I am not sure what you are asking. Your pwm source right now has duty cycle set to 50%, so you need to change the on time to get the duty cycle that you want.

 

I have a buck converter and ı should give an input DC 200 V and the output shoud be 72 V.
How can ı set a voltage 72V at the output of this buck converter?
Is there any ratio code? I sent the calculations and netlist file

View attachment 148952

 

View attachment 148953
View attachment 148952

Thank you,
How can ı add trace to calculate Output Voltge Ripple DeltaVo/Vo?

 

use these lines at the end of the file
.TRAN 0 10m 9m
.meas maxx max V(3)
.meas minn min V(3)
.meas percent_ripple PARAM (maxx-minn)/(maxx+minn)/2*100

 

use these lines at the end of the file
.TRAN 0 10m 9m
.meas maxx max V(3)
.meas minn min V(3)
.meas percent_ripple PARAM (maxx-minn)/(maxx+minn)/2*100

Unrecognizable command error for these

 

what spice simulator are you using? in ltspice it works nicely.

 

what spice simulator are you using? in ltspice it works nicely.

I use pspice

 

Then either use ltspice, or read the manual on how to do similar measurements in pspice.

 

use these lines at the end of the file
.TRAN 0 10m 9m
.meas maxx max V(3)
.meas minn min V(3)
.meas percent_ripple PARAM (maxx-minn)/(maxx+minn)/2*100

ı didnt understand where is over two

 

ı didnt understand where is over two

I don´t understand what that sentence means.

 

I don´t understand what that sentence means.

In the formula there is an /2. is it for max+min or is it for total equation

 

In the formula there is an /2. is it for max+min or is it for total equation

I tried it but the result is 200.It should be 1 where is the mistake

 

max-min is the peak to peak value
(max+min)/2 is a sort of average, but you could use same actual average function instead and have the result more accurate and versatile.
Ratio of those two is the percentage of ripple.

200-200=0
(200+200/2)=200
0/200=0 so the result should be 0, not 1 and not 200.
I think you have an issue with the brackets.

 

Can you help me to do f part

 

Can you help me to do f part

Input 200V Output 72 V

 

What do you need exactly? Add that resistor in series and do the same measurement.

 

What do you need exactly? Add that resistor in series and do the same measurement.

I add but as i said i can't write the output voltage ripple.I tried you said but result should be 1 without rc and 8 with rc

 

then post what you have