A novel sliding mode controller for DC-DC Boost converters

The paper presents a novel sliding mode controller for a bidirectional boost converter. The proposed sliding surface has been analytically derived from the mathematical model of the structure and is guaranteed to be attractive and stable. Contrarily to other sliding mode strategies presented in the technical literature, the approach considers a combination of both the state variables of the converter. The corresponding control input can be easily supplied trough a standard pulse width modulation technique, guarantying a priori known maximum switching frequency and avoiding any insurgence of chattering. The critical point of the proposed control technique is represented by an explicit dependence on load resistance, which is easily solved with a simple online load estimation. The approach has been validated numerically and compared with a state-of-the-art sliding controller.