Mobile Phone Battery Charger Circuit Diagram

Small and portable unit, Can be assembled on veroboard

Mobile phone chargers available in the market are quite expensive. The circuit presented here comes as a low-cost alternative to charge mobile telephones/battery packs with a rating of 7.2 volts, such as Nokia 6110/6150.

Circuit diagram:

Mobile Phone Battery Charger Circuit Diagram

Parts

R1 = 1K
R2 = 47R
R3 = 10R
R4 = 47R
C1 = 1000uF-25V
D1 = LEDs any color
D2 = LEDs any color
D3 = LEDs any color
D4 = 1N4007
D5 = 1N4007
IC1 = LM7806
T1 = 9VAC Xformer 250mA
BR1 = Diode bridge 1A

Circuit Operation:

The 220-240V AC mains supply is down-converted to 9V AC by transformer T1. The transformer output is rectified by BR1 and the positive DC supply is directly connected to the charger’s output contact, while the negative terminal is connected through current limiting resistor R2. D2 works as a power indicator with R1 serving as the current limiter and D3 indicates the charging status. During the charging period, about 3 volts drop occurs across R2, which turns on D3 through R3.

An external DC supply source (for instance, from a vehicle battery) can also be used to energies the charger, where R4, after polarity protection diode D5, limits the input current to a safe value. The 3-terminal positive voltage regulator LM7806 (IC1) provides a constant voltage output of 7.8V DC since D1 connected between the common terminal (pin 2) and ground rail of IC1 raises the output voltage to 7.8V DC. D1 also serves as a power indicator for the external DC supply. After constructing the circuit on a veroboard, enclose it in a suitable cabinet. A small heat sink is recommended for IC1.

20 comments:

lautsprecher kabel [Reply]: I am using mobile battery charger since long time but after reading your blog i understand how it works in side that. Nice tutorial with diagram. Thanks for sharing.; 04 September, 2009
lautsprecher kabel [Reply]: I am using mobile phone battery since long time but i don't know how it works in side the charger. After reading your post i understand about it. Nice information with diagram. Thanks for sharing.; 04 September, 2009
Anonymous [Reply]: Your article is useful for those who wants to develop their knowledge in electronics.; 05 December, 2009
Anonymous [Reply]: i am astudent and i have fount your articals important please i request you to sent me more circuit daigrams for mobile charger; 07 December, 2009
Izhar Fareed [Reply]: Dear user !
Subscribe via email to get all upcoming circuits right in your inbox.; 09 December, 2009
Anonymous [Reply]: since long time but after reading your blog i understand how it works in side that. Nice tutorial with diagram. Thanks for sharing.
lookup reverse phone numbers; 11 December, 2009
hari [Reply]: i have a doubt...if ac and dc operates simultenously,the battery will be charged by which source..; 15 December, 2009
kenneth [Reply]: kenneth on 16 april 2010. i have constucted a charger with the knowledge abstract.; 16 April, 2010
sachin [Reply]: SACHIN ARORA @hari...only ac source wil help as we are using transformer which does nt transmit dc voltage to secondry windings...; 04 September, 2010
the boss [Reply]: i want a circuit diagram for n no of led in series .. plz help me out!!!; 15 October, 2010
Viresh [Reply]: There are certainly a whole bunch more details to take into consideration, but thanks for sharing this article.
Offshore Development; 15 November, 2010
Mr Abdulla [Reply]: i want circuit diagram for led light power suply; 18 December, 2010
keerthi [Reply]: thanks for sharing..but i feel more informative if explanation would be done with block diagram of each component used...include some basic functions of each.. asap..; 19 February, 2011
Deependra Singh [Reply]: I want to know that whether both 12V DC supply and AC supply are to be given in circuit?
If not which components are not to be used; 27 June, 2011
Unknown [Reply]: Its good n thanks for sharing.but it would me more better if u provide clear n elaborate explanation about the circuit n i have a doubt that here we are using both ac n dc supply...are they needed compulsory?if so y?n which supply is actually used for chargng here?; 07 November, 2011
Abrar M [Reply]: can 9v ac , 500mA transformer can be used for this circuit; 18 January, 2012
Abrar M [Reply]: i want to know that can i use 500mA transformer instead 250mA transformer; 18 January, 2012
manoj2800 [Reply]: Hi all, i have tried and tested a capacitive dropped regulated power supply for mobile battery charging. Just eliminate the transformer and put 1mf/400vdc capacitor and then followed by rectifier circuit and then 7805 , which is abslutely running commercially. I m a manufacturer of Mobile phones charger in India, and using this circuit only , its very cheaper, say Indian rupees 20/- does it all.
Enjoy.; 02 April, 2012
Manoj Arakulam [Reply]: Which Software is used to draw this schematic diagram?????????; 05 April, 2012
Extreme Circuits [Reply]: Microsoft Windows Paint (mspaint); 06 April, 2012