Buck Boost Converter with PI control

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Weijie Yin
Weijie Yin on 6 Dec 2011
Answered: G.A Chaudhry on 4 Sep 2014
http://img97.imageshack.us/img97/9180/buckboostconverter.jpg
Hi all,
I am trying to implement a PI controller to regulate the output voltage of a Buck Boost Converter. The link shows my circuit layout. The way i implemented the PI controller with PWM works on a buck converter.
However, when i switch it to a buck boost converter, it doesnt work. From what i see, there is no output being feedback to the sum-er to be added to the Vref of 20V.
Appreciate any help on this, as i have been stuck at this problem for days.

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Answers (2)

SUDHAKAR REDDY AKKI
SUDHAKAR REDDY AKKI on 27 Jan 2012
What ever you done is wrong. so, just Replace the the Power switch and inductor ...
G.A Chaudhry
G.A Chaudhry on 4 Sep 2014
the direction of the diode is not correct if u r considering buck-boost topology as well.

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