A novel sensorless sliding Mode Control strategy for DC to DC converters: Analysis, modeling and simulation

DC-DC switch-mode converters recently have been increasingly used in many EV and HEV applications when the power distribution is in the form of multi-converter DC electrical system due to their good specifications. Different control strategies such as sliding mode control and current mode control have been applied to DC-DC converters to improve their robustness, efficiency, and stability. However, most of them need to measure the inductor current or output voltage to work properly; especially when the variation of input voltage or output load is large. This paper proposes a new control strategy by modification of two afore-mentioned schemes and elimination of inductor current and capacitor voltage sensors by introducing converter model and feed-forward of the input voltage. Thus, a dynamic current reference is also derived to mitigate the large load/input voltage variations effects. The output voltage dynamically tracks the reference voltage even when disturbances in input voltage or load current are large. Discrete-time computer simulation results are presented to validate the robustness and fast dynamical response of proposed control scheme. Thus, realization with DSP controller becomes feasible.