The charge level is scheduled through the switch S3 that enables to decide on one of the three voltages 6, 12 and 24 V. This signal is converted In square wave through the gates IC5 / A-IC5 / B-IC5 / C-IC5 / D and the synchronized signal, entering TR4 and IC2 then TR1 and TR2,Īs can be seen, DS3-DS4-SCR1-SCR2 form an ideal bridge offering the voltage necessary to charge the battery. The AC mains signal is identified up by two photocouplers OC1-OC2 to be able to know if the zero crossing of the sinusoidal signal occurs at 50 Hz. The integrated circuits of the control circuit of this battery charger are provided from the voltage rectified by DS1-DS2 smoothed by C1 and stabilized at 33 V by TR3 and the DZ1 attached to its base The regulator IC1 after that stabilizes it at 15 V. As displayed in the full circuit diagram of this universal 6V, 12V, 24V automatic battery charger circuit for the automobiles, we employ a transformer T1 of 190 VA reducing the stage 230 V to 32 V (additionally of course).
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