A Kumar R
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India
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Hi Mikay,
I have a few thoughts which might answer your question.
First of all, i don't think it is the model of ideal loss less buck converter. Because, without modelling the load this circuit is just a low-pass filter as raja pointed out. It is ideal from the view point of not having any resistances (DCR or ESR) associated with inductance and capacitance. But, not having load component does not mean an ideal buck converter and it should be there.
Without the load resistance what happens is the entire inductor current will flow through the capacitor (DC+ ripple). But, in normal buck converter only the ripple component will flow through the capacitor which will integrate it and give us the voltage ripple. But, here what is happening is there is dc current flowing through the cap and it will keep on integrating it and it will manifest itself as huge oscillations at the output. I think that is why you are observing those oscillations at the output.
Connect some load res at o/p and see the magnitude of oscillations.
Thanks Anil Reddy
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