Mobile phones charger Circuits 6v to 12v

Most mobile chargers don't have current/voltage regulation or short-circuit protection. These chargers give raw 6-12V DC for charging the battery pack. Most of the mobile battery packs have a rating of three.6V, 650mAh. For increasing the lifetime of the battery, slow charging at low current is judicious. Six to 10 hours of charging at 150-200mA current could be a appropriate possibility. this may stop heating from the battery and extend its life.

Circuit diagram:

Parts:

Resistors:

P1 = 10K LOG
R1 = 1K
R2 = 1K
R3 = 1K
R4 = 1K
R5 = 3.3K
R6 = 16R/2W
R7 = 220R
R8 = 3.3R
R9 = 1K

Capacitors:

C1 = 470uF/25V
C2 = 10uF/25V
C3 = 1KuF/25V

Semiconductors:

D1 = Red LED
D2 = Green LED
Q1 = BC547
Q2 = BD677
ZD1 = 12V/1W
ZD2 = 5.6V/1W
IC1 = CA3130

 Description:The circuit delineate here, provides around 180mA current at five.6V and protects the transportable from surprising voltage fluctuations that develop on the mains line. that the charger may be left ‘on’ over night to fill again the battery charge. The circuit protects the transportable moreover because the charger by straight off disconnecting the output once it senses a voltage surge or a brief circuit within the battery pack or instrumentation. It may be known as a ‘middle man’ between the present charger and therefore the transportable.

It has options like voltage and current regulation, over-current protection, and high- and low-tension cut-off. an extra specialty of the circuit is that it incorporates a brief delay of 10 seconds to change on once mains resumes following an influence failure. This protects the transportable from instant voltage spikes. once short-circuit happens at the battery terminal, resistance R8 senses the over-current, permitting Q1 to conduct and lightweight up D1. Glowing of D2 indicates the charging mode, whereas D1 indicates short-circuit or over-current standing.

The value of resistance R8 is very important to urge the specified current level to work the cut-off. With the given worth of R8 (3.3 ohms), it's 350 mA. Charging current may also be modified by increasing or decreasing the worth of R7 exploitation the ‘I=V/R’ rule. Construct the circuit on a standard PCB and house in an exceedingly little plastic case. Connect the circuit between the output lines of the charger and therefore the input pins of the transportable with correct polarity.

Electronics Circuit Application