A low voltage DC Power supply for fluorescent lamps with battery protection unit

Abstract

A wide range of electronic equipment uses Uninterruptible Power System units in order to continue operating in case there is loss of power supply. Due to their battery, the Uninterruptible Power Systems guarantee that the electronic device will operate autonomously for a certain period of time. In this work, an automatic charger/regulator circuit for a lead-acid battery is developed. The charger/regulator circuit consists of the battery charger, the electronic circuit that supplies the load with DC voltage and the circuit that protects the battery from deep discharge.The specifications of the aforementioned circuit are appropriate for the DC voltage supply of a pharos's lighting device (fluorescent lamps). The charger/regulator circuit charges the battery via the 230V AC mains voltage in order to supply the lighting device (load) with 12V DC. In case the mains voltage is interrupted, the battery continues to supply the load with 12V DC. The battery stops to supply the load when its voltage becomes less than 9.5V, in order to avoid damage due to deep discharge. Index Terms -Uninterruptible Power Supply (UPS),Battery's protection.

Electric Heavy Vehicle Transportation Highway (By Catenary System)

“…In our project we have given 230V AC to overhead Transmission line which is taken through supply. When pantograph is connected to transmission line, current is transfer to the rectifier (to convert AC current to DC current) and then provide to motor of the Vehicle [2,7]. Simultaneously current is also provided to battery for charging.…”

“…In this paper we have used the Catenary System technology on which Electric train runs , however we have used Two Line AC System (230 AC). This power is collected through Pantograph and Rectifier is used to convert 230 AC into 12 volt DC ( Fig 7) and by utilising this electrical Power, battery is charged and able to drive the vehicle [2,7] as shown in fig 1 . In this technology we can used small capacity battery (12V-7AH lead acid battery)(Fig. 8) hence overall weight as well as initial cost of the vehicle is also reduced.…”