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USB Mobile Charger Circuit

This document presents a digital logic design (DLD) solar battery charger circuit project by students at the University of Central Punjab. It introduces a USB mobile charger circuit that provides a regulated 4.7 volt output from a 5V USB source to safely charge mobile phones. The circuit diagram and operation are described, including components like a 470 ohm resistor, 100uF capacitor, BC547 transistor, 4.7V zener diode, and 1N4007 diode. It regulates the output voltage using the transistor, controls it with the zener diode, and protects polarity with the diode. Connecting the USB plug to the circuit allows charging a mobile phone for use while traveling.

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Shahzaib Ali
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706 views3 pages

USB Mobile Charger Circuit

This document presents a digital logic design (DLD) solar battery charger circuit project by students at the University of Central Punjab. It introduces a USB mobile charger circuit that provides a regulated 4.7 volt output from a 5V USB source to safely charge mobile phones. The circuit diagram and operation are described, including components like a 470 ohm resistor, 100uF capacitor, BC547 transistor, 4.7V zener diode, and 1N4007 diode. It regulates the output voltage using the transistor, controls it with the zener diode, and protects polarity with the diode. Connecting the USB plug to the circuit allows charging a mobile phone for use while traveling.

Uploaded by

Shahzaib Ali
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Digitial Logic Design

(DLD)
Solar Battery Charger
Presented by:
G1F18BSCS0083 Muhammad Usama
G1F18BSCS0092 Muhammad Shahzaib
G1F18BSCS0107 Muhammad Nadeem
G1F18BSCS0084 Muhammad Waleed

Prof G.A Khan


PGC GRW
Univeristy Of Central Punjab
Gujranwala Campus
USB Mobile Charger Circuit
Now the charging of your mobiles has been made easy with the help of USB outlets present in
the Laptop and PC. For the charging of your mobile phone, this circuit provides you a regulated
voltage of 4.7 volts. 5 volts of DC voltage and 100mA of current is being provided by the USB
outlet which is well enough for the mobile phone charging slowly. We can use this circuit to
charge the mobile while we are in journey also.
The USB port of the mobile is used for the charging, as the USB port is the very helpful voltage
source that can charge the mobile. Nowadays, there are two to four USB ports on the laptops
that are available in the market. USB actually refers to Universal Serial Bus. It is one of the
newest incarnations of method which is used to get information in as well as out from your
computer. We are concerned at the fact that ±5 volts of power is being provided by the USB port
to the external devices and can avail at the pin number1 while on pin number 4, it is 0V. Till 100
mA of current can get from the USB port which is more than sufficient that we required for this
small application.

USB Mobile Charger Circuit Diagram:

Components used in this Circuit:

 R1-470E
 C1-100uF/25V
 T1-BC547
 Zener diode-4.7V/. 5W
 Diode-1N4007

Components Description:
 Resistor: Flow of current in the circuit is being controlled by the resistor.
 Capacitor: It is mainly used to store the charges. It is of two types polarized and
non-polarized, electrolytic capacitor is an example of polarized while ceramic and
paper is non polarized.
 Transistor: It used to enlarge the signal strength or to open or close the circuit.
 Zener Diode: When the voltage achieves the breakdown point it starts working but
in the reverse bias state.
 Diode: It is a having two terminal named as anode and cathode. It allows the current
to flow only in the forward direction while stopping the flow of current in the
backward direction.

USB Mobile Charger Circuit Description:

The large number of mobile batteries work on 3.6 volts 1000


to 1300mAh.These battery are combinations of three Lithium cells whose voltage rating is
1.2 volts for each. And for charging mobile quickly there is a need of 4.5 volts and current
range of 300-500 mA.

If you want to increase the efficiency of your battery than it is good to charge it slowly. The
circuit which is explained below work on 4.7 regulated voltage and provide sufficient
amount of current for the slow charging of your mobile phones. The voltage at the output is
harmonized by the transistor named T1. While the output voltage is being controlled by the
Zener diode ZD and the polarity of the output which is supply is protected by D1.

”A type” of USB plug should be connected with the front part of the circuit. To ease the
polarity identification connects pin1 to the red color wire while the black color of the wire is
connected with pin 4.Now connect the output of the circuit with the appropriate charger pin
to attach it with your mobile phones. After all the parts of the circuit gather together, put the
USB plug in the socket and from the circuit measure the output with the help of multimeter.
If you got the correct output and if the polarity is connected in the right manner then attached
your mobile phone with it.

Now a days you will get a multicharger easily available marker just purchase one and charge
your moble easily when you are in train or bus as every now carries laptop or note pad with
them.

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