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|Date Adds||Wednesday 29th of March 2017 01:06:41 AM|
Learn how easy it can be to construct a cellular phone charger, that may charge your cellular phone battery from the comfort of your vehicle itself anytime, anywhere.
Cell phones are getting to be so indispensable that it really is so difficult to guide a life without these smart gadgets. We have already mentioned the working of mobile devices in our previous article. But one big drawback (for pessimists) with these mobile devices is their life of the battery, with a limited supply some time and eventually gets discharged from a certain time period of usage. Thus it needs to be recharged whenever it gets flat.
eval(ez_write_tag([[468,60],'brighthubengineering_com-banner-1','ezslot_6']));Normally all cellular phones are provided having a charger of the company's own from your manufacturer itself. But these cellphone chargers Cheap are intended to be used with the domestic AC outlets only, and cannot supply outdoors where an AC supply is just not available (for example during picnics, long tours, trekking, or even in the middle of the highway).
The present circuit of the dc to dc mobile phone charger is very designed to provide in conjunction which has a 12 volt automobile battery, otherwise it may be permanently placed in your car or bike as an emergency mobile phone charger.
The circuitry inside cellular phones is sophisticated and advanced, hence the internal parameters are incredibly strict and sensitive, and also the margin of error is narrowly confined. It absolutely won't charge unless and prior to the charging voltage and current matches exactly using the internal guidelines.
Normally it used in mobile phones are of your 3.7 volt lithium-ion type and also the current (AH) can vary greatly with different models.
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It is wired throughout the well-known 7805 voltage regulator IC, which single handedly performs the function of the perfect cellphone charger.
Keeping the printed side from the IC facing us
The 7805 IC and its configuration as described above are shown in the picture from the IC inside the adjacent image. It will give you a clear Bike Accessories idea for the reader as to what is being discussed.
This resistor does an important function of current limiting and restricts the flow of excess current to the phone. Without this the cell phone may not except the charge and will read "not charging." Connect 100?? /25v and a100nf capacitors on the input and the output with the IC respectively to filter out the voltage spikes and transients even though the vehicle is in motion.
Finally the complete circuit might be enclosed in a very suitable plastic enclosure with two outlets for inputs and outputs each.
Though the circuit in the DC cellular phone charger described above using the 7805 IC might appear to become over simple, yet the charger created from this circuit is unquestionably full of several salient features. They are as follows:
1) Excellent voltage/current regulation.
2) Current restricted to a safe value,
3) Cell phone battery can't ever be overcharged,
4) The IC 7805 is thermally and short circuit protected thus the complete circuit is virtually indestructible.
National University of Singapore
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