Battery charger is used to recharge a dc battery. Battery charger consists of a step down transformer, a rectifier circuit, a filter circuit. The step down voltage from the transformer is fed to the dc rectifier which is filtered by filter circuit and finally sent to the dc battery which is to be recharged. The battery charger may be continuous charging type or intermittent charging type. In a battery charger which continuous charging type the low rating dc current is continuously supplied to the battery while it is connected to the load. This way the battery keeps on recharging while its supplying dc power to a load. In intermittent type battery charger, the charger charges the dc battery after some intervals but with high currents. This way the battery gets charged instantly for the amount it gets from the battery charger. A battery charger has a DC voltmeter which displays the charging voltage, a DC ammeter which shows the charging current at which the battery is being recharged by the battery charger, a protection devices which disconnects the battery charger from the battery in case there is a short circuit or overcharging of the battery. Battery charges find their applications where ever there are batteries. The batteries are installed as secondary source of power supply in case of power failure where a critical protection system is working. Battery charges are also equipped with the indicating equipments to display the battery state. Battery charger can have remote monitoring RTUs fitted with them to monitor the state of battery charger from a remote central control room. Softbitonline manufacture such GSM/GPRS wireless data loggers & RTUs.
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SMS or text based switching also requires a relay to be fitted with the modem along with a circuit to switch on or off the equipment. (110314)