PLEASE CONNECT A 10uF ACROSS PIN2 AND PIN4, SO THAT THE OP AMP OUTPUT ALWAYS BEGINS WITH A "HIGH" ON POWER SWITCH ON How to Set Up the Circuit The following circuit corrects this flaw and makes sure that the IC741 is able to monitor and keep track of the battery health continuously under all circumstances. To correct this we need to make sure that at the full-charge level, the battery negative is only cut-off from the supply line, and not from the IC 741 circuit line. This implies that now the IC 741 is unable to monitor the discharging process of the battery, and will be unable to restore the battery charging when the battery reaches the lower discharge threshold? At the full-charge level as soon as the battery negative is cut-off by the TIP122, this negative from the battery is also cut-off for the IC 741 circuit. The above transistorized 6V charger circuit has a mistake. Note: The LED indicator section for all 3 following diagrams were recently modified after a practical testing and confirmationĬircuit#2 PLEASE CONNECT A 10uF ACROSS PIN2 AND PIN4, SO THAT THE OP AMP OUTPUT ALWAYS BEGINS WITH A "HIGH" ON POWER SWITCH ON
If you don't wish to have this latching arrangement, you can very well eliminate the 1N4148 feedback diode. The existing low at pin#6 will also cause pin#3 to become permanently low through the linked 1N4148 diode, and thus the system will be latched, until power is switched OFF and ON again. The battery will now begin charging slowly and as soon a its terminals reaches at 7V, pin#2 will tend to become higher than pin#3, causing pin#6 of the IC to become low, switching OFF the relay and cutting off supply to the battery. This will switch ON the transistor relay driver, which in turn will shift the relay contact from N/C to N/O connecting the charging supply with the battery. Now when battery is connected, the supply from the battery will actuate the circuit, and assuming the battery to be in a discharged state, pin#2 will be lower than pin#3 causing a high at pin#6 of the IC. How it WorksĪssuming no battery is connected with the circuit, when power is switched ON, the relay contact will be at the N/C and no power will be able to reach the IC 741 circuit.
6 VOLT BATTERY CHARGER FULL
The following circuit shows a simple automatic 6 volt 4 to 10 AH battery charger circuit using a 12 volt relay, designed to automatically cut off the supply to the battery as soon as the full charge level for the battery is reached. (At present i am charging my above said battery by simply using LM317 with 220 ohm and 1 kilo ohm resistors and a couple of capacitor) i'm awaiting your article, thank you". Please use transistor instead of relay to stop charging, and also tell me how to use 12 volt relay for the same circuit.Įxplain Which is safe and durable either relay or transistor to cut off charging.
The charger should automatically stop charging as the battery is fully charged. "Dear sir, please post a circuit to charge 6 volt 3.5 ah lead acid battery from 12 volt battery.
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