Using the USB port on your computer to charge your player’s batteries is not always practical. What if you do not have a computer available at the time or if you do not want to power up a computer just for charging? Or what if you are traveling? Chargers for Mobile Phones iPods and MP3 players are available but they are expensive and you need separate models for charging at home and in the car.
This charger can be used virtually anywhere. While we call the unit a charger, it really is nothing more than a 5V supply that has a USB outlet. The actual charging circuit is incorporated within the iPOD or MP3 player itself, which only requires a 5V supply. As well as charging, this supply can run USB-powered accessories such as reading lights, fans and chargers, particularly for mobile phones.
The supply is housed in a small plastic case with a DC input socket at one end and a USB type "A" outlet at the other end, for connecting to Mobile Phone, an iPod or MP3 player when charging. A LED shows when power is available at the USB socket. Maximum current output is 660mA, more than adequate to run any USB-powered accessory.
Pictures, PCB and Circuit Diagram:
Parts:
P1 = 1K
R1 = 1R-0.5W
R2 = 1R-0.5W
R3 = 1R-0.5W
R4 = 1K
R5 = 560R
R6 = 10R-0.5W
R7 = 470R
C1 = 470uF-25V
C2 = 100nF-63V
C3 = 470pF
C4 = 100uF-25V
D1 = 1N5404
D2 = 1N4001
D3 = 1N5819
D4 = 5.1V-1W Zener Diode
D5 = 5mm. Red LED
L1 = 220uH
S1 = USB 'A' Type Socket
SW1 = On/Off Switch
IC1 = MC34063A
Specifications:
Output voltage ----------------------5V
Output current ---------------------660mA maximum for 5V out
Input voltage range ------------------9.5V to 15V DC
Input current requirement ----------500mA for 9V in, 350mA for >12V input
Input current with output shorted--- 120mA at 9V in, 80mA at 15V in
Output ripple ------------------------14mV (from no load to 660mA)
Load regulation ----------------------25mV (from no load to 660mA)
Line regulation ----------------------20mV change at full load from 9 to 18V input
No load input current ----------------20mA
(The specification for the computer USB 2.0 port requires the USB port to deliver up to 500mA at an output voltage between 5.25V and 4.375V).
The circuit is based around an MC34063 switch mode regulator. This has high efficiency so that there is very little heat produced inside the box, even when delivering its maximum output current. The circuit is more complicated than if we used a 7805 3-terminal regulator but since the input voltage could be 15V DC or more, the voltage dissipation in such a regulator could be 5W or more at 500mA. and 5W is far too much for a 7805, even with quite a large heatsink. Credit for this circuit goes to SiliconChip, A wonderful electronics magazine.
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19 comments:
hello,
im currently studying A2 Design Technology at my 6th form and this 'mobile phone and ipod battery charger circuit board' is exactally the circuit board i need for my project. im designing and making a charging station, which needs two USB ports on a circuit board which are either battery powered or powered by the mains. the reason for me telling you this, is that i have a few questions about this circuit board and also i was wondering if you would be interested in making this or a similar circuit board for me for a fee?
kind regards,
luke.
Lmckenzie.howard@googlemail.com
@Luke
Actually this design comes from Silicon Chip and i have not tested it myself. I am 100% sure that it works fine. Tell me what you want to know. I will try to explain.
hi,
i have project to build solar usb mobile phone charge(iphone, Blackberry, nokai, etc) and i need to know if this circuit will work fine if it is powered by using solar cell with 6v output voltage.
Can you please tell me the exact values of the resistors that used in this circuit.
best regards
Ahmad
Can you tell me what is the serial number of TVS diode you used?
Regards
Ahmed
what resistor to change to adjust the voltage and current?
hello again,
can you please also tell me the D3 - TVS diode you used.
thanks,
Luke
Lmckenzie.howard@googlemail.com
Hi,
I am thinking to build this. As per the circuit the diode D2 is TVS while D3 is IN5819. Is TVS diode a schottky? if so please post the number or type of replacement schottky diode. Did not get any result when I googled this TVS diode.
HELP us!!! When we connect our ipod to charger it does not indicate that its charging and the led light goes off! pls help...
Help me aswell!! I've made this circuit board and honestly exactally the same thing happens to me!! I've tested how the voltage going through the circuit to the USB and there's 9volts... Maybe the USB is the wrong way around other than that can't see a fault!? Please help... And if you find a way to make yours work (comment above) please let me know how! Ha thanks.
Lmckenzie.Howard@googlemail.com
luke.
@Zen1133
Just check out connections same as located in diagram.
@Luke
Have you adjusted voltages through P1?
Hi Luke and Zen 1133,
I think that you have swapped the D2 and D3 diodes. D2 is the TVS diode which i think is a fast zener of 27 Volts and D3 is IN 5819.Look up data sheet of MC34063A by on semiconductors. it has a same circuit in it except the input D1 and D2.
Regards
Karanbir
Hi All,
TVS diode is a Transient Voltage Suppressor diode.
Regards
Karanbir
circuit looks great. one question, would it be able to charge a mobile phone battery with 900mA current rating.
@Anonymous
Yes it can charge 900mA current rating battery.
@Izhar Fareed
thank you.
IS THE COMPONENTS VALUE CORRECT ?
DOES THIS CIRCUIT WORKS?
Hello,
Haw thin can you make a phone charger? Can you make a 4 mm thin ?
Thank you for your time.
Socivoi_andrei@yahoo.com
can I substitute MC34063A to TD34063?
can someone explain the working of the circuit
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