USB Cellphone Charger circuit

Posted on Feb 7, 2014

You can charge your Mobile Phone from the USB outlet of PC. This simple usb cellphone charger circuit can give regulated 4. 7 volts for charging the mobile phone. USB outlet can give 5 volts DC and 100 mA current which is sufficient for the slow charging of mobile phones. Most of the Mobile Phone battery is rated 3. 6 volts at 1000 to 1300 mAh.

USB Cellphone Charger circuit
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These battery packs have 3 NiMh or Lithium cells having 1. 2 volt rating. Usually the battery pack requires 4. 5 volts and 300-500 mA current for fast charging. But low current charging is better to increase the efficiency of the battery. The circuit described here provides 4. 7 regulated voltage and sufficient current for the slow charging of the mobile phone. Transistor T1 is used to give the regulated output. Any medium power NPN transistor like CL100, BD139, TIP122 can be used. Zener diode ZD controls the output voltage and D1 protects the polarity of the output supply. Front end of the circuit should be connected to a A type USB plug. Connect a red wire to pin1 and black wire to pin 4 of the plug for easy polarity identification. Connect the output to a suitable charger pin to connect it with the mobile phone. After assembling the circuit, insert the USB plug into the socket and measure the output from the circuit. If the output is OK and polarity is correct, connect it with the mobile phone. T1 & D1 will drop approx 0. 7 volts each, so 5V (usb) min 1. 4 volts will drop too much volts. More over it is mentioned if input polarity is wrong then battery will be damaged. In presence of D1 reverse volts will be blocked then how it can damage battery. Clarification of these facts required please Most Mobile battery is rated between 3. 2 to 3. 6 volts. Even if T1 and D1 drops voltage, sufficient voltage will be available to...

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