Travel charger circuit

Posted by Erick Widyanto

Travel charger circuit. Here's a perfect Mobile charger using 1.5 volt pen cells to charge cell phone on a trip. It may replenish mobile phone battery 3 or 4 times in places where AC power isn't available. The majority of the Cell phone batteries are with a rating of 3.6 V/500 mA. Just one pen torch cell can offer 1.5 volts and 1.5 Amps current. Therefore if four pen cells are connected serially, it'll form battery power pack with 6 volt and 1.5 Amps current. When power is used towards the circuit through S1, transistor Q1 conducts and Green Leds.

When Q1 conducts Q2 also conducts since its base becomes negative. Charging current flows in the collector of Q1. To lessen the charging voltage to 4.7 volts, Zener diode D2 can be used. The output gives 20 mA current for slow charging. If more current is needed for fast charging, lessen the worth of R4 to 47 ohms to ensure that 80 mA current is going to be available. Output points are utilized to connect the charger using the cell phone. Use suitable pins with this and fasten with correct polarity.
Travel charger circuit
Travel charger circuit
Part Travel charger circuit

R1 = 1K
R2 = 470R
R3 = 4.7K
R4 = 270R
R5 = 27R
C1 = 100uF-25V
D1 = Green LED
D2 = 4.7V/1W Zener
B1 = 1.5Vx4 Cells
S1 = On/Off Switch
Q1 = BC548
Q2 = SK100