Faculty Publications
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Publications by NITK Faculty
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Item A Fuzzy Logic Based Switching Methodology for a Cascaded H-Bridge Multi-Level Inverter(Institute of Electrical and Electronics Engineers Inc., 2019) Azeem, H.; Yellasiri, Y.; Jammala, V.; Shiva Naik, B.S.; Panda, A.K.In this letter, an unusual switching technique is implemented using a fuzzy logic approach. The proposed technique simplifies the conventional method by eliminating the traditional logic-gate design. The fuzzy logic pulse generator acts as a lookup table as well as a pulse generator. On the basis of the modulation index as input, controlled membership functions (MFs) and rules of the fuzzy logic controller open various possibilities of producing pulses directly. The proposed technique is evaluated on the cascaded multi-level inverter with symmetric and asymmetric operations using selective harmonic elimination pulsewidth modulation. MFs are designed on the basis of pre-calculated firing conditions for different modulation index values. Hardware verification is carried out to support the proposed switching technique. © 1986-2012 IEEE.Item A Novel Quadruple Boost Inverter With New Optimized Fuzzy-Based Switching Scheme(Institute of Electrical and Electronics Engineers Inc., 2024) Aditya, K.; Yellasiri, Y.; Shiva Naik, B.S.; Nageswar Rao, B.N.; Panda, A.K.This brief proposes a novel quadruple boost nine-level inverter (QB-NLI) and an optimized switching pattern using fuzzy logic controller. The suggested method simplifies the traditional approach by removing the conventional logic gate circuit design. The pulse signal generator and lookup table are both derived using a fuzzy logic pulse generator. Fuzzy logic controller (FLC) and Controlled membership functions (MFs) rules open numerous prospects for generating pulses based on the input as modulation index. The suggested technique is examined on the proposed QB-NLI topology using the selective harmonic elimination PWM method. MFs are created based on averaging Newton Rapson and quantizer firing angles for diverse modulation index (mi) values. The proposed QB-NLI structure comprises ten switches with one dc-voltage source and two capacitors. The proposed structure's circuit description, modes of operation, proper component selection, and a new fuzzy-based switching scheme are presented. Further, a discussion about the comparative analysis of the proposed switching technique with other switching techniques concerning THD and RMS voltages is presented. In addition to the simulation results, experimental tests are conducted under various load conditions on the built-in hardware prototype to evaluate the proposed QB-NLI structure and switching technique. © 2023 IEEE.