6V 4Ah Battery Charger Circuit Design With Automatic Cutoff and Full Charge Voltage

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#1 21680441 07 Aug 2018 18:33

madhusoodanan er madhusoodanan er

Anonymous

Post #1
21680441 07 Aug 2018 18:33

I am trying to design a 6 v 5Ah battery charger circuit with automatic cutoff. When the fully charged condition, what will be the terminal voltage. My charging voltage is 7.5v. Please help me.
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#2 21680442 08 Aug 2018 17:40

David Ashton David Ashton

Anonymous

Post #2
21680442 08 Aug 2018 17:40

How you charge a battery depends very much on its chemistry. What type of battery are you charging? Sounds like lead-acid (the voltages fit) but might be NiMh, unlikely to be lithium, could even be NiCd. Tell us more, please!
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#3 21680443 08 Aug 2018 22:53

madhusoodanan er madhusoodanan er

Anonymous

Post #3
21680443 08 Aug 2018 22:53

My battery 6v 4 ah lead acid battery
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#4 21680444 09 Aug 2018 21:16

Rick Curl Rick Curl

Anonymous

Post #4
21680444 09 Aug 2018 21:16

Try this:Go to DigiKey and type "battery charger" in the search box. From the results page, click Active, Lead Acid, 3 cells, and then pick any other features you need. Once you narrow it down to a few IC's, look at the example circuits on the spec sheets and pick the one you're most comfortable with.-Rick
#5 21680445 10 Aug 2018 00:37

madhusoodanan er madhusoodanan er

Anonymous

Post #5
21680445 10 Aug 2018 00:37

Thanks, sir.
#6 21680446 10 Aug 2018 01:30

Rick Curl Rick Curl

Anonymous

Post #6
21680446 10 Aug 2018 01:30

My pleasure.Once you get further along with it, please come back here and let us know how it's going.-Rick
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#7 21680447 14 Aug 2018 06:58

David Ashton David Ashton

Anonymous

Post #7
21680447 14 Aug 2018 06:58

One further comment. not all lead acid batteries are the same. It may be worth getting a datasheet on your specific battery to fine-tune your terminal voltages and other parameters. This may prolong your battery life.
#8 21680448 30 Sep 2018 14:41

Colin Mitchell Colin Mitchell

Anonymous

Post #8
21680448 30 Sep 2018 14:41

Obviously he was not helped.

Just get a 6v AC 1 amp transformer and put a bridge on the output. Put an 8 ohm 5 watt wire wound resistor on the positive line and connect your battery to the leads. Let the battery charge for 8 hours each time it gets flat.
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Topic summary

✨ The discussion focuses on designing a 6V 4Ah lead-acid battery charger circuit with automatic cutoff and determining the appropriate terminal voltage at full charge. It is emphasized that charging parameters depend on battery chemistry, with the user confirming a 6V 4Ah lead-acid battery. Recommendations include consulting specific battery datasheets to optimize terminal voltage and charging parameters for battery longevity. One practical approach suggested involves using a 6V AC 1A transformer with a bridge rectifier and an 8-ohm 5W wire-wound resistor in series to limit current, charging the battery for about 8 hours per cycle. Additionally, searching for lead-acid battery charger ICs on DigiKey and reviewing their datasheets and example circuits is advised to select a suitable integrated solution.
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6V 4Ah Battery Charger Circuit Design With Automatic Cutoff and Full Charge Voltage

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Topic summary