I have read from several different sources that the duty ratio for a Cuk converter is
(Vo/Vin)=(-D/(1-D)

but several other sources say its:
(Vo/Vin)=(D/(1-D)


which is the correct one...i'm tad bit confused..

 

Short answer: The former ((i.e. -D/[1-D]) is correct (from a 'positive' perspective)...

Note that Ćuk conversion schemes are, in essence, a variant of buck/boost topology (q.v.) hence the similar operation/performance thereof...


Best regards
HP

 

Short answer: The former ((i.e. -D/[1-D]) is correct (from a 'positive' perspective)...

Note that Ćuk conversion schemes are, in essence, a variant of buck/boost topology (q.v.) hence the similar operation/performance thereof...


Best regards
HP

This is a snippet from the power electronics book from mohan and undeland, they say otherwise...
furthermore, I did some simulation and I got results which say (Vo/Vin)=(D/(1-D) is correct

 

This is a snippet from the power electronics book from mohan and undeland, they say otherwise...
furthermore, I did some simulation and I got results which say (Vo/Vin)=(D/(1-D) is correct

If you already know the answer, why did you ask?

 

If you already know the answer, why did you ask?

just to make sure....

 

The first responder did not accomplish that. Maybe some other people will answer and you can arrive at a two out of three or a three out of five consensus.

 

The first responder did not accomplish that. Maybe some other people will answer and you can arrive at a two out of three or a three out of five consensus.

yeap

 

This is a snippet from the power electronics book from mohan and undeland, they say otherwise...
furthermore, I did some simulation and I got results which say (Vo/Vin)=(D/(1-D) is correct

The sign on the duty cycle is a matter of convention (specifically "truth" in the logical sense) - I stand by my reply -- On the other hand, if your perspective works for you, fair enough! -- 'tho I daresay insistence upon counter-conventionalism seems an unnecessary obstruction to communication...

Sincerely best regards
HP

 

The sign on the duty cycle is a matter of convention (specifically "truth" in the logical sense) - I stand by my reply -- On the other hand, if your perspective works for you, fair enough! -- 'tho I daresay insistence upon counter-conventionalism seems an unnecessary obstruction to communication...

Sincerely best regards
HP

Thanks for the reply HP, I was just a bit puzzled as to why different folks used different signs. It makes sense now...Thank you