12 Volt Battery Charging Circuit System

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Many of the electronic appliances work on 12VDC, and if its portable appliance it uses a 12V Battery to power up. In case the battery drains up fast we also need chargers for these rechargeable batteries. This project serves this need in a very simple and compact construct. With power source from the mains supply through an adapter this project can charge a battery with auto cut off feature. The output should be given to a 12VDC Battery. When a 12VDC Adaptor is connected to the system, the system powers up and scans if the output terminal has a voltage level less than 12VDC or not. If the Battery level is below 12VDC then the charging circuit is triggered ON. Charging remains ON till the Battery level reaches 12V and then the charging circuit is turned OFF automatically. The voltage sensing IC senses the voltage level to trigger the charging events. 12VDC voltage level has to be configured into the IC so that it considers this voltage level as the reference level. Once the reference is set the monitoring by the IC triggers a relay to charge the Battery if it is found to be below the reference level. Similarly, the relay is turned OFF automatically once the charge level reaches or passes by the reference level or 12VDC.