6v Battery Charger Circuit For Lead Acid Battery _ Simple Electronics 62622t

6V Battery Charger Circuit for Lead Acid battery : simple electronics

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http://www.simple-electronics.com/2011/10/6v-battery-charger-circuit-...

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converter using IC

This simple charger is good for 6V lead acid batteries.The main part of the

regulator

circuit is the LM317 regulator IC that limits the output voltage based on R1

converter using Zener

and R2 values. The charger automatically turns the supply off when battery

u fan controller

reaches its full charge voltage. It has a led indicator that turns on when the

dc-dc converter by 555

battery is fully charge thus help you when are you going to remove the battery from the charger.

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Part List: D1, D2, D3, D4 - 1N4001, 1N4004 or similar diode Dz - 1N5235B or any 6.8V zener diode

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2012-02-01 11:39 PM

6V Battery Charger Circuit for Lead Acid battery : simple electronics

2 of 4

http://www.simple-electronics.com/2011/10/6v-battery-charger-circuit-...

LM317 pins

PNP transistor pins

NPN transistor pins

Note: If you need a more improve charger with current and voltage control, try to modify the automatic 12V charger circuit.

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Labels: Battery Charger, LM317 circuits

12 COMMENTS:

Umer, November 2, 2011 1:38 AM sir how to modify this circuit to charge a 4V 0.7A lead-acid battery?

DH-gm, November 2, 2011 5:38 AM The easiest way to modify the circuit is just replace the diode

2012-02-01 11:39 PM

6V Battery Charger Circuit for Lead Acid battery : simple electronics

3 of 4

http://www.simple-electronics.com/2011/10/6v-battery-charger-circuit-...

DZ with 3.9V zener diode. This simple modification is enough to charge your battery but it lowers charger efficiency (no big deal). See also the 6V solar charger replace the Dz also with 3.9V zener. It’s the simpler version of the charger above.

Umer, November 2, 2011 8:14 AM what is the purpose of Q1 in this circuit?

DH-gm, November 2, 2011 8:25 AM The main purpose of Q1 is to make sure that the charger is more sensitive and cut off the charging if it senses that the battery is fully charged. Without Q1, the circuit still works the way it is designed but there is a chance that it will take some time before it stops the charging, thus might damage your battery. But you don't have to worry because the two versions are working fine.

Umer, November 2, 2011 8:48 AM thank you sir.

Sambhav, November 5, 2011 6:33 AM what is the current rating of center tap transformer...

DH-gm, November 5, 2011 6:43 AM The transformer rating is dependent on the size of the battery. A 10VA transformer or 1A current will do. Just take note that its useless to size up your transformer above 1.5A since the maximum current that your regulator can control is 1.5A max only.

Umer, November 7, 2011 12:20 AM can I use 9014 or BC548 transistor for Q2, and without center tap 9V 0.5A transformer?

DH-gm, November 7, 2011 12:43 AM 9014 or BC548 transistor for Q2 is okay. Or any NPN transistor of similar specs. For your transformer, convert it in full bridge type, meaning you need two more diodes (4 pcs of diode D1 in total). Just see the AC-DC converter on how your 9V transformer with no center tap is assembled.

Umer, November 9, 2011 8:05 AM what is the purpose of R4 2.2 kilo ohms resistor?

DH-gm, November 9, 2011 1:48 PM The main use of R4 is to make sure that the base voltage of transistor Q2 is 0V when the battery is not fully charged. It will ensure also that the charger will not turn off unless the battery voltage reaches the full charge state.. But you can remove it if you want with out any bad effect to the charger.

Gayan228, December 29, 2011 1:11 AM I want to charge a 6V battery which has 12AH. What should be the values of R1 & R2 or what are the required adjustments to this circuit in order to charge my battery. Many thanks in advance.

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