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Real-Time Implementation of Modified Fuzzy Logic Controller for a Non-Linear Quasi-Resonant DC-DC Converter

This paper describes the design and implementation of Modified Fuzzy Logic Controller (MFLC) for a non-linear quasi-resonant converter (QRC). It is shown that the two-dimensional rule table of conventional FLCs (CFLCs) used in power converters can be reduced to one-dimensional rule table using MFLC. The proposed MFLC reduces the memory space and computing time of the fuzzy algorithm. The tuning of scaling factors and the generation of fuzzy rules is also easier when compared with CFLC. As a result, realizing MFLC in a Microcontroller or Digital Signal Processor is made simple. The proposed controller structure is universal and it can be directly applied to any of the dc-dc converter topologies. In this paper, the application of MFLC is successfully verified for the voltage control of Extended Period (EP)-ZCS/ZVS-QRC through simulation and experimental studies using TMS320F2407A Processor. The ability of MFLC compared to CFLC, to achieve good transient response for load variations and supply disturbances are demonstrated.