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chopper
Associate

Join Date: Nov 2009
Posts: 31

mobile phone charging characteristic

01/30/2010 2:05 AM

hi everyone, i have a project which involve charging cell phone, therefore i would like to find out mobile phone internal charging characteristic.

I open up my cell phone charger and wat i saw is transformer and some rectifying circuit.

So what i would like to ask is , what will happen when the cellphone battery is fully charge?will the internal circuit in the cellhone limit the current which enters the phone?or the current will be continuosly provided until a person switches of the charger?

thanks for the reply
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Electroman
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United Kingdom - Member - Olde Member!! Engineering Fields - Instrumentation Engineering - New Member

Join Date: Jul 2006
Location: Dunstable, England
Posts: 2821
Good Answers: 45
#1

Re: mobile phone charging characteristic

01/30/2010 10:53 AM

The batteries often have internal circuits to regulate and charge the battery as well as external sensing - the battery charger is just a dumb switch mode power supply.

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Haajee
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Join Date: Feb 2006
Posts: 1758
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#2
In reply to #1

Re: mobile phone charging characteristic

01/31/2010 5:38 AM

Regards

Exactly what you say for old & cheaper Chargers. Some 3 years back it was of 1 x stepdown 5V transformer, 1 x rectifier diode & all. Some had a Bridge rectifier instead of diode. And mostly single input voltage, i.e. 220V or 110V.

But some better are in market & with mobile-phone kit. No transformer, multivoltage i.e. almost from 90V to 250V, electronic-controlled supply, slim in size & weight.

And of course control of charge is built-in phones not in charger.
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