Author Topic: Precise definition of CCM vs DCM (converters)  (Read 729 times)

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Offline MattjdTopic starter

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Precise definition of CCM vs DCM (converters)
« on: March 31, 2019, 03:47:49 am »
Hi, I'm studying buck,boost, and buck boost converters and I am a little confused on the exact definition of CCM vs DCM.

I have some plots for a buck,boost, and buck boost converter. I plotted the transient response for buck, boost, and buckboost. In the case of the buck boost converter and the boost converter there is a short time, before steady state is reached, that the current through the inductor goes below zero. I.e. it was zero for some instant of time. Now from what I've read, I believe that would mean DCM, despite having designed for a L>Lcrit which would be needed for CCM. Now at steady state, the current through the inductor for all 3 topologies is never zero.

Is a more precise definition of CCM, that during steady state, the current through the inductor never reaches zero? DCM on the other hand, will have zero current at some point in time in steady state.
 


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