International Journal of Industrial Electronics and Electrical Engineering (IJIEEE)
The proposed on-line Uninterruptible Power Supply (UPS) offers AC voltage regulation on continuity basis which incorporates with the controllable battery charger. The charge control technique used for battery is constant current charging technique. The constant current is achieved by limiting the duty cycle of charger (or step-down chopper). Based upon the proposed constant current charging technique, a digital charger is designed and is control through PIC 16F877A microcontroller software. In proposed paper, protection of battery over charge and battery under discharge is available with relay trip through PIC 16F877A microcontroller by monitoring voltages on continues basis.