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Home A» DIY Projects A» How To Make Automatic Battery Charger?How To Make Automatic Battery Charger? Have you ever tried to design a battery charger which charges the battery automatically when battery voltage is below the specified voltage? Below charger automatically shut off the charging process when battery attains full charge. This automatic battery charger circuitA is mainly involves two sections a€“ power supply section and load comparison section. Lm317 voltage regulator output is applied to the battery through the diode D5 and resistor R5. If the battery voltage is below 12V, then the current from LM317 IC flows through the resistor R5 and diode D5 to the battery.
When the battery voltage rises to 13.5V, the current flow to the battery stops and zener diode gets the sufficient breakdown voltage and it allows the current through it. Now the base of the transistor gets the sufficient current to turn on so that the output current from LM317 voltage regulator is grounded through the transistor Q1.
The output voltage of the battery charger should be less than 1.5 times of the battery and the current of the charger should be 10% of the battery current.
An Automatic Battery Charger Circuit for sealed lead acid batteries is mentioned in this project.
When the charge in the battery falls below 13.8V, the output of LM358 is high and the output of 555 is low. The AC supply is converted to 15V DC with the help of transformer and bridge rectifier and the Green LED is turned on.
This is important as SCR stops conducting only when the supply voltage is 0 or disconnected from supply and it is possible only with pulsating DC. This is filtered with C1 and when the potential reaches 6.8V, Zener ZD1 starts conducting and supplies enough Gate voltage to SCR2 to turn it on.
As a result, the current flows through SCR2 via R2 and SCR1 is turned off as both gate voltage and supply voltage are cut off.
In the scehmatics of LM317 based 1st Project, I am not able to locate POT, its connections and its value.
Hi , I am just curious to know if this could be used to charge 2 12 volt slap batteries in series with the input voltage coming from the pedaling of a bicycle connected to a motor with the polarities reversed in order to create voltage. Now the 10K adjust the voltage very well but without SCR the red LED only turns off when it is higher than 13 V. The AC source is given to the step down transformer which converts the large AC source into limited AC source, filter the AC voltage and remove the noise and then give that voltage to the SCR where it will rectify the AC and give the resulting voltage to the battery for charging. The AC main voltage is given to the step down transformer the voltage should be down to 20V approx.
When the battery connecter to the charging circuit, the battery will not be dead completely and it will get discharged this will give the forward bias voltage to the transistor through the diode D2 and resistor R7 which will get turned on.
When the battery voltage is dropped the forward bias will be decreased and transistor gets turned off. This will charge the battery when the voltage drop in the battery decreases the forward bias current also gets increased to the transistor when the battery is completely charged the Transistor Q1 will be again turned on and turned off the SCR. The principle behind the circuit lies in controlling the switching of an SCR based on the charging and discharging of the battery. When the battery charge drops below a threshold level, the comparator output is so as to turn the SCR on and the battery gets charging again.
For a voltage of 9V across the potential divider, the voltage across the pot and resistor should be above 5.2V (reference voltage level). Output current from LM311 is about 50mA and since here we are using transistor BC547 with a low base current, we require a resistor of about 150 ohms.

Initially when the circuit is powered and the battery level is below the threshold voltage, the circuit performs the task of charging the battery. Now when the battery starts charging and at a certain point when it is fully charged, the voltage across the potential divider reaches a value above the reference voltage. The AC to DC conversion here uses only the rectifier and may contain AC ripples as there is no filter.
In the previous post we haveA A seen the circuit diagram of 9v battery charger circuit using LM311 and SCRA .In this post let us see the circuit for recharging Lead-Acid battery using Solar panel. Here is the simple circuit to charge 12V, 1.3Ah rechargeable Lead-acid battery from the solar panel.
Solar battery charger operated on the principle that the charge control circuit will produce the constant voltage. Circuit must have adjustable voltage A regulator , so Variable voltage regulator LM317 is selected. Schottky diode isA  used to protect the LM317 and panel from reverse voltage generated by the battery when it is not charging. If the battery requiresA initial current more than 1.5A,it is not recommended to use LM317.
All the above mentioned parameters have to be taken into account before charging a battery. In this project, power is limited because of the thermal resistance of LM317 voltage regulator and the heat sink. I require circuit diagram of solar current controller of 48 volt 30 amp solar current controller.will you please provide me circuit diagram of above. I want to use a solar panel, but I want to automatically stop charging the battery when it is full as well.
This unregulated DC voltage is now applied to the LM317 variable voltage regulator to provide regulated DC voltage.
The output voltage of this voltage regulator is varied by varying the pot 10k which is connected to the adjust pin of LM317. Now base of BD139 NPN transistor gets the current through the zener so that the total current is grounded. At this time zener diode D6 will not conduct because battery takes all the current for charging.
Battery charger should have over voltage protection, short circuit protection and reversed polarity protection. The 15V Zener diode is used to set the LM317 to supply 16.2V at output in the absence of load.
LM336 is used to supply a reference voltage of 2.5V to non-inverting terminal (Pin 3) of LM358. When SCR1 is conducting, 15V DC will flow through the battery and the battery starts to charge. All what you need is to change the circuit to 5 volt output and it come on different circuit. So if you want to charge your battery with AC source then should follow these steps, we need first limit the large AC voltage, need to filter the AC voltage to remove the noise, regulate and get the constant voltage and then give the resulting voltage to the battery for charging. When the transistor is turned off automatically the diode D1 and resistor R3 will get the current to the gate of the SCR, this will triggers the SCR and gets conduct. The AC signal is rectified using a SCR and a comparator is used to detect the battery charge voltage with respect to a reference voltage so as to control the switching of the SCR. Here the SCR acts as a rectifier as well as a switch to allow the rectified DC voltage to be fed to charge the battery.
For this purpose we select a potential divider arrangement consisting of 22K resistor, 40K resistor and a 20k pot.

The SCR gets triggered with a voltage at its Gate terminal through the resistor R1 and diode D1. A For normal charging operation, this reference voltage is more than the voltage across the potential divider and the output of the comparator is less than the threshold voltage required to trigger the NPN transistor into conduction. This implies the voltage at the inverting terminal is less than the voltage at non inverting terminal and the output of the comparator is more than the threshold base emitter voltage for the transistor. At the same time as the diode D3 is forward biased, it starts conducting and this blocks the triggering the SCR gate voltage as it is now connected to low potential or ground. This solar charger has current and voltage regulation and also has over voltage cut off facilities. When the 2N4401 is turned ON by the output of 555, the ADJ pin of the LM317 is grounded and its output voltage is 1.3V. A voltage divider network is used to supply a portion of batterya€™s voltage to inverting terminal (Pin 2) of LM358.
Batteries with different potentials like 6V and 9V can also be charged by choosing appropriate components. When the charge on the battery is almost full, it opposes the flow of current and the current starts to flow via R5.
I will try to charge my 12V battery from my wind tribune I have build with used electronic devices’ components.
In case the battery gets fully charged, this situation is detected using a comparator circuit and SCR is turned off. Primary of the transformer is connected to 230V AC supply whereas the secondary is connected to the rectifier. The transistor and the diode D3 thus remains off and the SCR gate gets triggering voltage through R1 and D1. Consider the IC TP4069, which can give a constant voltage of 4.2V and a programmable current upto 1A. This solar energy is not only used on the Earth but also used in space stations where no electrical power is available. This circuit may also be used to charge any battery at constant voltage because output voltage is adjustable. The output voltage and current are regulated by adjusting the adjust pin of LM317 voltage regulator. LM317 voltage regulator internally has temperature limiting circuit so that if it gets too hot, it shuts down automatically. Im doing a project for my HNC level 4 Electrical and Electronics engineering so i will need to alter some parts. As the DC current starts flowing to the battery through the resistor R2, the battery gets charged.
Again when the battery charge drops below the threshold level, the charging operation resumes in the manner described above. The voltage across the potential divider consisting of the pot RV1 and resistor R4 depends upon the voltage across the battery. The resistor R7 and diode D4 are to ensure a small amount of trickle charging takes place in case of the SCR being in off condition.

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