Small-signal analysis of interleaved dual boost converter

This paper presents a systematic development of steady-state, small-signal models of interleaved dual boost converter operating in a continuous current mode. These models are derived by employing the well-known signal flow graph method. This signal flow graph approach provides a means to directly translate the switching converter into its equivalent graphic model, from which a complete behaviour of the converter can easily be studied. Steady-state performance, small-signal characteristic transfer functions are derived using Mason's gain formula. The bode plots of audiosusceptibility, input impedance, output impedance, and control-to-output transfer functions are determined and illustrated using MATLAB for different values of load resistances, duty ratios. Small-signal frequency responses obtained from the signal flow graph method are validated with PSPICE simulator results. To validate the signal flow graph modelling equations, sample steady-state experimental results are provided. Copyright (C) 2001 John Wiley & Sons, Ltd.