Passivity Based Control of Dc-Dc Converters Operating In Discontinuous Conduction Mode
Keywords:
Passivity Based Control, DC-DC Converters, Discontinuous conduction mode (DCM)Abstract
This paper discusses the extension of the passivity based control approach to DC-DC converters operating in discontinuous conduction mode (DCM) such as buck, boost and buck-boost. To do this, a valid average model for these power converters is presented. The proposed regulator is based on a “damping injection” scheme, achievable through nonlinear dynamical feedback. The idea of this strategy is to synthesize the control law in order to ensure that the closed loop system is passive and therefore asymptotically stable. The performances of the proposed passivity-based control are evaluated for the buck converter. The regulating feedback law, derived on the basis of a buck model composed of ideal switches and ideal circuit components is assessed, via computer simulations. The paper, unlike other studies in the literature, shows that the proposed control provides excellent dynamic performances for the DC-DC converters operating in DCM. It is capable to provide a good regulation of the output voltage in a wide range of the load resistance.
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