Small-signal model and control of the interleaved two-phase coupled-inductor boost converter

Coupled-inductor boost converters are under development for high-current, high-power applications ranging from automotive fuel cells to photovoltaics. This paper presents the small-signal analysis of a coupled-inductor boost converter operating in both CCM and DCM. Due to the complexity of operation of a coupled-inductor boost converter operating in DCM, several small-signal models must be derived. Controllers for the converter are developed using the resulting small-signal models. Experimental validation of these controllers is presented from a 1 kW coupled-inductor boost converter laboratory prototype.