JEYARAJ.C - (105902133029)

MANIBHARATHI.S- (105902133034)

RAJESH.J - (105902133051)

USB Mobile Phone Charger Using the LC7805

Voltage Regulator

voltage charger cannot be taken with us during a traveling and it has many limitations.

so ,To avoid these limitations , we use the brand new model of usb cable charger using ordinary lithium batteries.

To charge our mobile phones ,we use a voltage regulated charger.

This circuit is useful to charge your mobile phone during your travel where there is no available AC power, will be able to refill 3-4 times in place. 

GND

7805

CLOCK USB

Input +9vOutput +5v

LC

BLOCK DIAGRAM

Input of 9v is given as input side .Battery of positive is connected to diode of D1

All it is really is two or more resistors/capacitors/diodes/inductors in series to connected

but the values are adjusted to achieve a specific voltage output.

the diode which ensures current flows in only one direction (we don’t want any mishaps). Of course, diodes do have a drop voltage.

Then we have two decoupling capacitors to smooth out the voltage coming in, and going out

The output is, get on voltage regulator circuit side.

When battery power is applied to the circuit through S1, transistor Q1 conducts and Green LED lights on .

Charging current flows from the collector of Q1.but ac power is not available.

Zener diode D2 is used. To reduce the charging voltage to 4.7 volts.

Most of the Mobile phone batteries are rated at 3.6 V/500 mA. A single pen torch cell can provide 1.5 volts and 1.5 Amps current.

Usb refers to types of cable, connectors used to connect these many

types of external devices.such as computers, mobile phones. The output gives 20 mA current for slow charging. If more current is

required for fast charging, reduce the value of R4 to 47 ohms so that 80 mA current will be available.

Input

When battery power is applied to the circuit through S1, transistor Q1 conducts and Green LED lights on .

Charging current flows from the collector of Q1.but ac power is not available.

Zener diode D2 is used. To reduce the charging voltage to 4.7 volts.

Most of the Mobile phone batteries are rated at 3.6 V/500 mA. A single pen torch cell can provide 1.5 volts and 1.5 Amps current.

Usb refers to types of cable, connectors used to connect these many

types of external devices.such as computers, mobile phones. The output gives 20 mA current for slow charging. If more current is

required for fast charging, reduce the value of R4 to 47 ohms so that 80 mA current will be available.

Input of 9v is given as input side .Battery of positive is connected to diode of D1

All it is really is two or more resistors/capacitors/diodes/inductors in series to connected

but the values are adjusted to achieve a specific voltage output.

the diode which ensures current flows in only one direction (we don’t want any mishaps). Of course, diodes do have a drop voltage.

Then we have two decoupling capacitors to smooth out the voltage coming in, and going out

The output is, get on voltage regulator circuit side.

• L7805/7805 voltage regulator (18¢).

•100 µF electrolytic capacitor (2¢).•10 µF electrolytic capacitor (2¢).

•1N400x rectifier diode (I used the 1N4001, 1.4¢).•9 V battery harness

•USB cable

To take easily for any where

Simple and low cost circuit

To avoid week less of batteries

Easily to made

To save power supply

To use travelling time To use ,not on power supply situations

http://www.elctroschematic.com

Refernce papers on ; electronic for you