STABILIZATION AND ROBUSTIFICATION OF NEGATIVE OUTPUT SUPERLIFT LUO CONVERTER USING SLIDING MODE CONTROL APPROACH

This paper depicts the design and implementation of non-linear control approach called sliding mode control for Negative Output Elementary Superlift Luo converter (NOESLLC).DC-DC converters finds its applications majorly in all power electronic industries nowadays. In order to provide a good regulation of output in these converters it is mandatory to make them operate in the closed loop mode using various controllers like P, PI and PID controller. But the usage of these controllers has resulted in an unsatisfactory regulation of the output voltage under large variation of system parameters. To overcome this, an approach called sliding mode control (SMC) technique is proposed and discussed here. The NOESLLC converts the positive input voltage into a negative output voltage in geometric progression. The design of the controller is done with the tuning of its gain parameter and implemented in the circuit by using the state space model of the converter. The main advantage of SMC over conventional control is its stability and good response variations with respect to the input. Simulation results are presented using PSPICE and MATLAB to validate the theoretical design and to illustrate the strength of the proposed controller