How can I measure in a exact point of a electronic circuit each cycle in Simulink?

Dear sir,

I am trying to simulate a buck circuit in Simulink. I have the circuit and I probe it in open loop and it works. The problem is when I try to work in close loop (I use a PWM control of the inductor current).

I need the value of the current in the inductor. This shape is triangular. I put a current sensor in my circuit and I get it. But for my control, I want to measure in the middle of the rising edge, because I need the average current. How can I do it?. I know that this point is in the middle of my duty cycle. I attach a capture of my circuit.

Thank you very much for your time.

[SIN YAN WU]

You can use this

https://www.mathworks.com/help/physmod/sps/powersys/ref/mean.html

try it.

[Álvaro Morales Muñoz]

That is a solution. But is there an option to get the value in a exact moment? I do not know why, I am having a high varation in the average value.

Thank you very much. I apreciate this attention a lot.

[Lud Erma]

Hi. U should synchronize carrent mesuarment with Hi value of PWM triangle carrier. It is center of DUTY, it works in case symmetrycal PWM carrier.

[Álvaro Morales Muñoz]

Thank you for your answer. Yes, I am using a symmetrycal PWM carrier. How can I do that in a efficient way? I tried this (see the images), but the result oscilates. I think it is not the best way.

Answer 1

[Tony Lennon]

SIN YAN WU on 31 Mar 2020 at 16:00

You can use this

https://www.mathworks.com/help/physmod/sps/powersys/ref/mean.html

try it.

Answer 2

[Tony Lennon]

Álvaro Morales Muñoz on 31 Mar 2020 at 17:18

That is a solution. But is there an option to get the value in a exact moment? I do not know why, I am having a high varation in the average value.

Thank you very much. I apreciate this attention a lot.

Answer 3

[Tony Lennon]

Lud Erma on 31 Mar 2020 at 17:55

Hi. U should synchronize carrent mesuarment with Hi value of PWM triangle carrier. It is center of DUTY, it works in case symmetrycal PWM carrier.

Answer 4

[Tony Lennon]

Álvaro Morales Muñoz on 7 Apr 2020 at 16:10

• Duda.PNG

• Duda 2.PNG

Thank you for your answer. Yes, I am using a symmetrycal PWM carrier. How can I do that in a efficient way? I tried this (see the images), but the result oscilates. I think it is not the best way.

[Álvaro Morales Muñoz]

I need to fix this to close the answer.