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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 multiconverter 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. Keywords -Buck Converter ； Current Mode ； Sliding Mode； Sensorless ControlI.

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