ADAPTIVE FUZZY LOGIC CONTROL OF A UNIVERSAL BRIDGELESS CHARGER FOR WIDE VOLTAGE BATTERY CHARGING SYSTEMS

Abstract

The increasing adoption of electric vehicles (EVs), portable energy storage systems, and industrial battery applications has accelerated the demand for efficient battery chargers capable of supporting wide output voltage ranges. Conventional battery chargers employing diode bridge rectifiers suffer from increased conduction losses, poor power quality, and reduced efficiency. This paper proposes an Adaptive Fuzzy Logic Controller (AFLC)-based universal bridgeless battery charger designed to operate over a wide battery voltage range while ensuring high efficiency and improved power quality. The proposed charger integrates a bridgeless power factor correction topology with an adaptive fuzzy control strategy to regulate charging current and output voltage under varying input and battery conditions. The adaptive fuzzy controller dynamically adjusts control actions based on charging state, load variations, and voltage deviations, thereby overcoming the limitations of conventional proportional-integral controllers. The charger supports multiple battery chemistries and voltage ratings without requiring significant modifications. MATLAB/Simulink simulations demonstrate that the proposed approach achieves near-unity power factor, low total harmonic distortion (THD), fast transient response, and enhanced charging efficiency across a wide operating range. The obtained results validate the suitability of the proposed system for next-generation universal battery charging applications.