Switching converters are nonlinear dynamic systems of variable structure. The control of output variables is accomplished by the proper choice of sequence and time duration of OFF and ON states of the switches. The theory of VSS (Variable Structure Systems) and deliberate introduction of sliding modes makes possible realization of rather simple and yet quite efficient control schemes for various types of converters (DC-DC, AC-AC, DC-AC). This paper presents a method for control system synthesis of DC-AC converters in the class of VSS systems.
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