Cuk Converter (Modulation Index, Inductances)

Thread Starter


Joined Oct 2, 2023
Hello! I'm currently trying to figure out how to solve a) and b) and I'd be happy about every single clue!
Additionally, I'm not used to the English terms and I'm doing a semester abroad, so I'm not on the same level as my course requires.

My solution for a) would be:

Modulation Index Min = (V_o-V_in,max)\(V_inmin-V_in,max) =0.5
Modulation Index Max = (V_o-V_in,min)\(V_inmax-V_in,min) =0.5

Logically, it seems wrong to me.

for b):


For maximum I'd use the same formula like L_2min, just using D_max instead. Is the solution correct?

Thanks in advance for any help!


Joined Jun 17, 2014
Hello there,

Why don't you do a more full analysis and then you can check this yourself. This will help when you don't have anyone to ask if the solution is right or wrong.

Start by writing a set of ODE's and go from there. It will be interesting too.
Have you ever done an analysis like this before? Like say on a buck circuit.