Hi all,

As new DC-DC converters are being proposed, associated control method should be proposed and based on the small-model signal analysis of the DC-DC converters. Using average space state (ASS) method, we can derive a full small-signal model of any DC-DC converters (though this is a tedious task and somehow less intuitive). This model can be very useful for conventional voltage mode control (VMC) method.

However, with new DC-DC converters, as more L,C and components are added, the order of DC-DC converters' small-signal model increases. Generally, the order of DC-DC converter equals to the number of L, C components. That is to say, the small-signal becomes more complex and sometimes, voltage-mode control method is not suitable anymore.

Current mode control (CMC) is a well-known method which can ease the controller design because in CMC the order of DC-DC converter reduces (inductor now plays a role as an current source, disappearing the second order caused by LC filter, and making the order become 1st one). Even reading the very technical works (such as from Ridley's PhD thesis etc., I cannot find any generalized method to derive the small-model signal using CMC. The derivations of CMC are almost only for conventional (simple) buck, boost, buck-boost converters.

How about a generalized method for any DC-DC converter ones with CMC method? (For example, are there any method such as using average state space method to derive small model signal of any DC-DC converters in current mode control?). Do you have any suggestions?

Thanks,

Ha