| T O P I C R E V I E W |
| farahalid |
Posted - Jan 01 2012 : 3:11:09 PM
this multi-brand phone charger that can display the status of phone battery and can cut off the suppy.. anyone can tell me,how to make schematic circuit for this project,,,???? i use lithium ion as a cellphone,,,please help me,,,
(Edit...Move to Power Supply) |
| 15 L A T E S T R E P L I E S (Newest First) |
| audioguru |
Posted - Mar 14 2014 : 12:15:06 PM
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. |
| audioguru |
Posted - Jan 18 2014 : 10:45:02 AM
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. |
| farahalid |
Posted - Jul 27 2012 : 1:27:29 PM
output voltage of my phone charger is 5.6V. which type of battery suitable for my charger?? is it lithium ion?? |
| pebe |
Posted - Jul 18 2012 : 3:07:14 PM
Buy a 5V DC wall adapter plug. That gets 5VDC from 110VAC. There are thousands for sale on ebay. Cheap as dirt! |
| farahalid |
Posted - Jul 18 2012 : 09:39:27 AM
my circuit use 5VDC source but from socket is AC source. how can i change AC to DC,, should i use rectifier circuit,,,how?? |
| remosobert |
Posted - Mar 14 2012 : 07:27:51 AM
Hi.., I have not found any battery chargers for the lithium ion batteries that charge one cell at a time which will charge a cell that has gone into protection mode. I think your adjustable voltage charger for lithium battery packs that can go up to higher voltages should work. You should have current limit protection and be able to set the amount of current you want to deliver to the battery, if so limit it to about 200 mA. I hope this helps, thanks. |
| Aaron Cake |
Posted - Feb 12 2012 : 10:37:54 AM
Have you read any of the information I pointed you to? All the datasheets explain it. These chips base charging rate on voltage, current and temperature. They have achieved full charge when the voltage is at an expected point for the temperature of the battery and current used. Li-Ion charging is well known at this point, and there's plenty of information available via the Google. |
| farahalid |
Posted - Feb 04 2012 : 12:39:03 PM
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? |
| farahalid |
Posted - Feb 02 2012 : 12:15:35 PM
what type of IC that should i use in this circuit?? |
| Aaron Cake |
Posted - Jan 28 2012 : 10:20:45 AM
The IC will include all those functions. |
| farahalid |
Posted - Jan 27 2012 : 08:18:44 AM
how can i add voltage and current sensor into my charging circuit ??? |
| Aaron Cake |
Posted - Jan 15 2012 : 10:40:12 AM
It depends on the IC used. It may have a "fully charged" output to which you could connect a transistor to drive a LED or buzzer. Or it may not, in which case you would need to make a voltage switch to turn on the LED/buzzer when the battery voltage reaches full. |
| farahalid |
Posted - Jan 14 2012 : 10:41:15 AM
how to add sound and light to battery charger??? the sound and light will ON when battery is full??? |
| farahalid |
Posted - Jan 09 2012 : 09:51:16 AM
thank you,,,,
|
| Aaron Cake |
Posted - Jan 08 2012 : 10:26:53 AM
The 3rd contact on the battery pack is used to read temperature from a thermistor inside the pack.
Google "lithium ion charging IC" for examples. There are many out there, most coming with detailed datasheets that tell you how to build a charging circuit with them. |
