Buck Boost Converter with PI control

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Weijie Yin
Weijie Yin 2011-12-6
回答： G.A Chaudhry 2014-9-4
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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回答（2 个）

SUDHAKAR REDDY AKKI
What ever you done is wrong. so, just Replace the the Power switch and inductor ...
G.A Chaudhry
G.A Chaudhry 2014-9-4
the direction of the diode is not correct if u r considering buck-boost topology as well.

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