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(BUCK BOOST)variable duty cycle pulse generator ....help!!!

pisaac001

New Member
am designing a Buck boost converter on simulink ... as u know with a buckboost... the set output does not change even if the input changes....
aslo the duty cycle needs to be changed with input voltage in order to have the desired output (-vout/-vout-vin)=dutycycle
i have attachd the circuit..
basically i want a duty cycle that changes as the input voltage changes..
is there away to get variable duty cycle on simulink
if not how do i build one ..
pls look at the circuit help me plsssss lol am ready to listen to ideas
am not sure if i explained the problem right if u dnt understnd wat i mean plss ask
 

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