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farahalid
Apprentece

12 Posts
Posted - Jul 18 2012 :  09:39:27 AM  Show Profile  Reply with Quote
my circuit use 5VDC source but from socket is AC source. how can i change AC to DC,, should i use rectifier circuit,,,how??
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Jul 18 2012 :  3:07:14 PM  Show Profile  Reply with Quote
Buy a 5V DC wall adapter plug. That gets 5VDC from 110VAC. There are thousands for sale on ebay. Cheap as dirt!
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farahalid
Apprentece

12 Posts
Posted - Jul 27 2012 :  1:27:29 PM  Show Profile  Reply with Quote
output voltage of my phone charger is 5.6V. which type of battery suitable for my charger?? is it lithium ion??
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Jan 18 2014 :  10:45:02 AM  Show Profile  Reply with Quote
quote:
Originally posted by farahalid

output voltage of my phone charger is 5.6V. which type of battery suitable for my charger?? is it lithium ion??

If your phone is about 30 years old or more then it uses a lead-acid battery.
If it is about 20 years old then it uses a Ni-Cad or Ni-MH battery.
If it is about 10 years old then it uses a Lithium battery.
Why don't you read the label on your battery??

Your phone has a complicated charger circuit inside made to charge its battery. The 5.6V adapter is simply a power supply for the charger circuit.

If you connect your 5.6V power supply directly to a battery then the battery will blow up without having the charging circuit.
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Mar 14 2014 :  12:15:06 PM  Show Profile  Reply with Quote
quote:
Originally posted by farahalid

I am fascinated how a cell phone battery charger knows when the battery is fully charged such that it cuts off the power to prevent further charging.

If its based on sensing a particular voltage has been reached, i wonder how is that achieved?
Or is it achieved by measuring the state of charge?

Is there a simple circuit to detect a certain voltage?

Please learn about charging a Lithium battery. www.batteryuniversity.com

I told you that the charging IC senses the charging current and when it drops to a low amount then it turns off the charger.
When the charging battery voltage reaches 4.20V then IT IS NOT FULLY CHARGED! It is only about 70% fully charged.
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