Fuzzy based controllers for single inductor multiple output buck converter

The paper orients to involve fuzzy based reasoning principles in the design of control strategies for improving the time response of single inductor multiple output (SIMO) dc-dc converters. The dc-dc converters with multiple outputs typically attempt to share the inductor current for varying loads and in turn necessitates accounting for cross regulation between the outputs. The philosophy envisages minimizing the output voltage variations to ensure a regulated output and augurs to reject line and load disturbances. It includes in its framework the design of a conventional PI controller, Fuzzy Logic Controller and Fuzzy based PI Controller. The simulation results of a single input dual output converter obtained from a MATLAB
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platform reveal that the Fuzzy based PI controller offers low rise time, settling time, steady state error value in addition to enjoying a higher immunity to load/line variations when compared with other controllers. The test results obtained using hardware with Fuzzy based PI control algorithm implemented in 89C51 Micro Controller validate the simulated response.