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

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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.

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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 31 Mar 2020
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.
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.

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### 답변(4개)

Tony Lennon 9 Apr 2020

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Tony Lennon 9 Apr 2020
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.

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Tony Lennon 9 Apr 2020
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.

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Tony Lennon 9 Apr 2020
Álvaro Morales Muñoz on 7 Apr 2020 at 16:10
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.

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I need to fix this to close the answer.

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