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praveensachin
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Joined: 09-Jul-2011
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Quote praveensachin Replybullet Topic: mobile cell phone charger using ic555
    Posted: 09-Jul-2011 at 9:14pm
need documentation of 30 pages..applications,advantages nd disadvantages nd working.......etc for mobile cell phone charger using ic555

 
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kranthikumar
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Joined: 21-Sep-2008
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Quote kranthikumar Replybullet Posted: 21-Jul-2011 at 12:56am
Came across this download...must be of some help to u....

Mobile Charger Circuit

Here’s a simple charger that replenishes the cellphone battery within two to three hours. Basically, the charger is a current-limited voltage source. Generally, cellphone battery packs require 3.6-6V DC and 180-200mA current for charging. These usually contain three NiCd cells, each having 1.2V rating.

Current of 100mA is sufficient for charging the cellphone battery at a slow rate. A 12V battery containing eight pen cells gives sufficient current (1.8A) to charge the battery connected across the output terminals. The circuit also monitors the voltage level of the battery. It automatically cuts off the charging process when its output terminal voltage increases above the predetermined voltage level.

Download Mobile/Cellphone Battery Charger Circuit

 
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