A Nonlinear Characteristic Impedance Tracking Controller for the CCM-DCM Boost Converter

A robustly stable nonlinear control algorithm for the DC-to-DC single switch Boost converter is proposed. The scheme does not require current sensors but only measurements of the capacitor voltage. The design procedure is based on the well-known passivity-based control (PBC) methodology. With this technique damping is injected by 'placing' artificial resistors in the circuit such that the characteristic impedance can be matched dynamically. In contrast to the conventional damping assignment philosophy, the design presented in this paper does not need the extension with an adaptive mechanism to ensure robustness against unmodeled changes in the load resistance. The controller is tested for both continuous (CCM) and discontinuous conduction (DCM) mode