Car battery charger

Posted on Feb 6, 2014

Given below, is a very simple circuit that can be used for charging car batteries. In this circuit there is facility for monitoring the charging current and voltage. The circuit is based on the IC MC78T12ABT from Freescale. The IC is nothing but a 7812 in TO-3 package with 3A capacity. The transformer T1 steps down the mains voltage and diodes D1&D

Car battery charger
Click here to download the full size of the above Circuit.

2 does the job of rectification. Capacitor C1 does the filtering and C2 acts as a decoupling capacitor. The ground terminal of IC1 is lifted to 2. 1V using the diodes D3, D4 and D5. So the output from the IC1 will be a regulated 14. 1V (12+2. 1). The battery is charged via diode D6. The D6 blocks reverse flow of current from battery to charging circuit when the mains power is not available. Meter M1 shows the charging current and M2 shows the charging voltage.

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