Power electronic converter duty ratio

Thread Starter

Johnjacob1992

Joined Feb 27, 2015
7
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..
 

Hypatia's Protege

Joined Mar 1, 2015
3,208
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
 

Thread Starter

Johnjacob1992

Joined Feb 27, 2015
7
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
 

#12

Joined Nov 30, 2010
18,190
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.
 

Hypatia's Protege

Joined Mar 1, 2015
3,208
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
 

Thread Starter

Johnjacob1992

Joined Feb 27, 2015
7
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 :)
 
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