Practical Implementation of Sensorless Robust Control of Boost Converter

Abstract

This paper proposes practical implementation of current sensor-less robust control technique for DC-DC boost converter. Close loop feedback control of DC-DC boost converter requires inductor current as feedback signal. However, inductor current requires expensive sensor for measurement which increases overall cost and complexity of system. To reduce cost, complexity and other associated problems we propose robust method for the estimation of inductor current by employing Higher Gain Observer (HGO). Furthermore, for robust control of output voltage control we used Non singular terminal sliding mode control (NTSMC). Moreover, proposed sensor-less control strategy is practically implemented using Field Programmable Gate Arrays (FPGA). It is shown by simulation that proposed system is robust under parametric variations and unknown disturbances.