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American University of the Middle EastCEEE201PROJECT


Our project relies upon tow thoughts the first one it’s an electrical circuit dependent on sunlight solar energy and the second one is an electrical charger circuit and on the off chance that you order them together you will have sun based power charger . We picked the sunlight based power since it’s a sustainable power source, accessible anyplace, ecofriendly, and cost sparing).

According to (Glenn T.Drilek) & (Merl E.converse) “The present invention provides for a fully flexible and variant battery charger which adjusts automatically to the charging mode and the voltage required.

The battery charger of the present invention automatically provides the most expedient charging mode, by providing a constant voltage region, a constant current region”.


The reason we picked this task the sun powered power – That it’s a sustainable power source, and it’s a source that you can find it anyplace.

The sun oriented vitality its great since it is eco-accommodating which implies that there are no unsafe gases originated from the sun powered board ,sun oriented power gives cost sparing on the grounds that you won’t have to pay for the power and as you probably are aware the expense of power keeps on ascending.

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Where the expense of the sunlight based board keeps on falling, and it’s a simple method to have power in poor nations.


I_max= I_SC= V_B1/R_5

I_LED = (V_B1- V_LEDF- V_DF)/(R_5+ R)

  • 1 – in the beginning we chose the yelow led to know if the solar is working or not “the led is 9 voltage “
  • 2 – thin we had a dayod silicon , and we used it to stop the electric from reversing in the battery.

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  • 3 – the voltage regulator have three limbs “the output is 5 volt because it’s charging in that voltage “

the two sides in the middle each one of them must have a specific value of voltage. one of them is 2 volt and the other one is 2.2 volt. While the positive is 5 volt and the ground is considered as 0 volt. all of the smartphones companies strategy is that they use these amount of voltage values to charge the phones.


  • 1- recognition of the need: the need of our task is to have sunlight based capacity to diminish the utilization of power ,additionally we can spare the general population reserves
  • 2- Definition of the design problem: The issue with solar power when you use it should happens when the sun is shining and if the weather cloudy the light or power will be less. Along these lines, substantial capacity frameworks should be produced to give a dependable wellspring of power when the sun isn’t shinning around evening time or when cloud goes overhead.
  • 3- definition of the design criteria an constraints: the design criteria that its an reliable solar energy charger that’s we chose the a good voltage regulator and a good solar panels that can work in hot spots and it’s a high caliber to work for quite a while
  • 4-the design loop:
    • -our first thoughts were to build a charger that easy to carry an we can take advantage of it everywhere
    • – we chose to run with a simple charger but after researching we chose to build a solar power charger
    • – we conclude that the solar power charger is the least difficult and the most appropriate, suitable for us

Complete Resultes:

Solar panel can be replaced with voltage source in series with resistance. So current is controlled as following:

I_max= I_SC= V_B1/R_5 = 9V/10=900 mA

This step is useful in simulation to replace the solar panel.

In day time the circuit left half will be as following:

In DC steady state C1 and C2 will be open circuits but they are useful in the circuit for filtering and fill drops in voltage.

A 0.7VDC will absorbed by D2 diode and a current will flow turning on the LED and the rechargeable battery will charge.

Forward voltage of LED VLEDF = 2.2V from datasheet of the LED

Forward voltage of diode VDF = 0.7V

Current passing through LED:

I_LED = (V_B1- V_LEDF- V_DF)/(R_5+ R) = (9-2.2-0.7)/(100+10) =54mA

That will feed the 7805-voltage regulator with:

V_in= I_LED*R + V_LEDF =54m – 100+2.2

V_in=7.6 V

The regulator will cut the input voltage and produce fixed 5 VDC required to power the USB.

Voltage divider circuit:

It’s used to give specific voltages on data pins of the USB. These voltages supposed to be seen by some smart phones to begin charging.

This extra divider circuit is optional because not all mobile phones need them on the USB data.

V_(D-)=V_cc R_4/(R_3+R_4 )=5 51/(51+75)=2V

V_(D+)=V_cc R_2/(R_2+R_1 )=5 51/(51+75)=2VDC

We can calculate currents I1 and I2

I_1=V_cc/(R_3+R_4 )=5/(51+75)=0.04mA

I_2=V_cc/(R_1+R_2 )=5/(51+43)=0.05m


Simulation shown below were got from Proteus software. The results were as expected.

LED is ON when we start simulation. Voltages produced as we calculated in previous section. Currents simulation also have close values to our calculations as shown below.


To close our project rely upon basic material and a basic sunlight power circuit and when we picked the sunlight power solar energy as our project we think about that its simple and eco-Fridley

We used a voltage controller voltage regulator that can change over any measure of voltage to 5 voltage since all the new advanced mobile phone require a 5 voltage of power to charge so the majority of our venture relies upon the advanced mobile phone organizations data.

Refrences :

  • 1- Converse, M. E., & Darilek, G. T. (1983). U.S. Patent No. 4,390,828. Washington, DC: U.S. Patent and Trademark Office

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American University of the Middle EastCEEE201PROJECT. (2019, Nov 22). Retrieved from

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