Abstract:
This paper presents a unified hybrid model with two level
networks for peak current mode controlled buck-boost converters
operating in continuous conduction mode (CCM) and
discontinuous conduction mode (DCM). It is a network model with
two levels in which both a detailed switching model and a small
signal average model are included correspondingly. The
nonlinearity of some electronic components and the parasitical
effects of circuit elements are considered. The nonlinear
inductance is calculated by finite element analysis (FEA). The
dynamical performance of the buck-boost converter can be
obtained from the detailed switching model in the first level
network, and then the frequency domain performance can be
obtained from the average model in the second level network. As
an automatic mechanism of exchanging data between two models
is proposed, all the performances can be obtained automatically.
By implementing the proposed model in Simulink surrounding,
both the large signal transient performance and the frequency
domain behavior of converters are obtained efficiently.
