Simulation of Single-Input Fuzzy Logic Control of Multi-output Zero-Voltage Switching Push-pull Quasi-resonant Converter

摘要

Recently the concept of quasi-resonant converters (QRCs) have been introduced to replace the conventional PWM converters to increase the power packing density and efficiency by commutating switches under Zero-voltage (ZVS) or Zero-current condition(ZCS). Multi-output dc-dc converters, which provide several, regulated and isolated outputs are widely used in the many applications. To meet the requirement of medium power applications a push-pull converter is proposed in this work. To improve the closed-loop performances of the QRCs and to achieve easy digital implementation of control algorithm, a single-input fuzzy logic controller (SFLC) is proposed and implemented in simulation with one dimensional fuzzy rule table for the voltage control of multi-output push-pull ZVS-QRCs. The performance measures of PI, CFLC and SFLC based on simulation results in terms of settling time, offset and Integral Square error are compared.