On the Generalized-Proportional-Integral Sliding mode Control of the "Boost-Boost" Converter

This paper presents a multi-variable DC-to-DC converter of the "boost-boost" type constituted by two cascaded "boost" converters in continuous conduction mode, each feeding an independent resistive load. A sliding mode feedback controller, based on the generalized proportional integral (GPI) approach, is developed for the regulation task. The feedback control scheme uses only output capacitor voltage measurements, as well as input signals represented by the switch positions. In addition robustness of the feedback scheme is tested by non-modeled sudden load resistance variations in the last resistive load. Experimental results verify theoretical predictions.