12 V Car battery charger based 7812

Published:2013/3/18 20:58:00 Author:Ecco | Keyword: 12 V , Car battery charger | From:SeekIC

Below isa verysimplecircuitthat can be usedto charge12vcar battery. In this circuitthere isinstallationstocontrolthe charging currentand voltage. Thecircuit is based onthe circuitMC78T12ABTICfrom Freescale. ICis actually a7812with a TO-3packagewith a capacity of3A. T1is atransformertoreducevoltageand thediodesD1andD2 performas arectifier.C1capacitoris to filterandthecapacitorC2 decoupling. The ground terminalofIC1is raisedto2.1Vusingthe diodesD3,D4andD5. Thus, theoutputofIC1is fed to14.1V(12+2.1).The battery is chargedthroughdiodeD6. D6 blocksthe flow ofreversecurrent from the batteryto the load circuit when AC poweris not available. MeterM1 showsthe charging currentand M2ofthe charge voltage.



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