travelling mobile charger by c.jeyaraj
DESCRIPTION
To charge our mobile phones ,we use a voltage regulated charger.These charger cannot be taken with us during a travelling and it has many limitations.To avoid these limitations , we use the brand new model of usb cable charger using ordinary lithium batteries. This device will work to power off only a mobile phone, but anything which requires 5V. to avoid the weekness of batteries so we use the new model of usb mobile phone charger regulator circuit. it’s pretty easy swap out the l7805 for any other similar voltage regulator to provide a different output.TRANSCRIPT
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
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