Battery charging is an essential and crucial issue regarding the cycling life and
performance of batteries. The objective of this study was to design and promote
the fast battery charger based on fuzzy logic control technique. In this study, a
fuzzy-logic-control-based (FLC-based) LiFePO battery charger was
experimented. The proposed charger takes the voltage and current of battery into
account, and adjusts the pulse width modulation (PWM) duty cycle accordingly.
The result showed that the proposed battery charger has the potentiality to retain
speed up time charging upto 33% at 2C current rate, which is less than existing
economical speed up time charging. Besides, at fuzzy logic condition the rate of
efficiency at 1C, 2C and 2.5C were 77, 82 and 81% respectively, while in case of
without fuzzy logic condition it were 77, 76, and 75 at at 1C, 2C and 2.5C. In
future this charging system can be utilized in various fields including electric
vehicles and many other portable devices.
Keywords: Electric Vehicle (EV), Fuzzy Logic Controller, LiFePO , PWM