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Solar Charger Portable Charger
Transcript of Solar Charger Portable Charger
Prof. Adinath Jain
As designers of portable devices pack greater functionality into products, power management requirements have increased. Products require multiple supply rails, battery charging and a variety of power management capabilities – all of which are implemented to maximise battery life. The frustration of a cell phone dying or a laptop powering off is not uncommon in our tech-driven world.
Why Solar Chargers
Solar Powered Portable Charger
R.V College of Engineering
Literature survey - 1
Literature survey - 2
Literature Survey - 3
Dr. G.S Anitha
3.1. Circuit Diagram
3.2. Circuit Components
Therefore solution to all these problems is utilizing the power of the sun, which is available everywhere
Solar Panel (12v 400mA 2w)
Battery - 6v 4.5Ah
Here is a solar charger circuit that is used to charge Lead Acid or Ni-Cd batteries using the solar energy power.
The circuit harvests solar energy to charge a 6 volt 4.5 Ah rechargeable battery for various applications.
The charger has Voltage and Current regulation and Over voltage cut off facilities.
The circuit uses a 12 volt solar panel and a variable voltage regulator IC LM 317.
The solar panel consists of solar cells each rated at 1.2 volts.
12 volt DC is available from the panel to charge the battery. Charging current passes through D1 towards the voltage regulator IC LM 317.
By adjusting its Adjust pin, output voltage and current can be regulated.
VR is placed between the adjust pin and ground to provide an output voltage of 9 volts to the battery.
Resistor R3 Restrict the charging current and diode D2 prevents discharge of current from the battery. Transistor T1 and Zener diode ZD act as a cut off switch when the battery is full. Normally T1 is off and battery gets charging current.
When the terminal voltage of the battery rises above 6.8 volts, Zener conducts and provides base current to T1.
It then turns on grounding the output of LM 317 to stop charging.
Advantages of using solar powered mobile charger-
1. It can be used as a traveling charger
2. It is easy to use
3. Most useful when there is no electricity
4. More comfortable for a physically challenged
5. No fear of electric shock
6. Effective: Compared to the other mobile chargers, the solar chargers are cost effective as it absorbs power from the sun. It does not require electric power.
7. Uninterrupted Power Supply: One of the greatest advantages of solar mobile phone charger is that it can be used to charge mobiles even during power outages.
8. Emergency Purposes: Another benefit is that it hardly requires any electrical outlet. It can therefore be used during emergencies and outdoor purposes.
9. Compact Designs: Solar mobile phone chargers are compact in size and easy to carry around.
1. One of the most important drawbacks is its price. Compared to the ordinary mobile phone chargers, it is quite expensive as it utilizes solar energy captivators.
2. Another significant drawback is the time frame required by the chargers to charge mobile phones. It can take six to eight hours to charge mobile phones Compared to the ordinary chargers.
Solar panels are as good as power supplies of an average of 12V in bright sunlight. The only problem is unregulated voltage due to variation in intensity of light.
• IC LM 317 solves the problem by regulating the output voltage but it again dissipated 2V across it which makes the system less efficient
• Solar charger circuits need voltage regulators so as to charge the batteries at constant voltage.
• The battery charging process should be stopped once it is fully charged and this is ensured using a zener which will start conducting at the cut off voltage.
• The charger circuit is a simple, ready to use lead acid battery charger and is a good way to tap sun’s energy on the go
Solar energy is a clean energy source and it is high time we understand its importance and embrace it in our daily lives.
• Solar cells are the heart of any circuit. In the circuit for this project, Solar panels were used as a power supply and fed into a voltage regulator so as to have a constant voltage charging for the battery.
• Batteries are the easiest way to store energy. Hence solar charger circuits aim at charging batteries rather than driving components.
• Rechargeable batteries like Lead Acid, Li-ion and NiMH are used depending on the user’s requirements. Here we have used sealed Lead Acid ones.
• It is also very necessary to cut off charging once the battery is fully charged. This is managed using a zener diode which switches on at the cut-off voltage and diverts the current through the transistor.
• The battery is thus charged at constant voltage and at desired rate depending on the amount of current supplied.
• Solar energy is the most abundant but least used source of energy. But it’s the solution to most of our problems
• The major challenges we face in going solar is expensive technology, limited space and energy. We need to address them by having more efficient materials and most importantly awareness among people so that they use it to their benefits.
Solar cell phone charger, D-Labs- Massachusetts Institute of Technology. Elizabeth de reqt
This paper represents a research trip to Sabana Grande, Nicaragua where after looking into the various problems faced by the local population, they looked into designing a solar powered cell phone charger than can be built indigenously. This was found to be of high importance as there was no electricity grid in the are and at the same time a large segment of cellphone users who were forced to pay a sum of $5 to $10 per charger for their cellphone.
They were able to design a small charger panel and associated circuitry to eliminate the need to cut the solar cells and still get appropriate voltage and power through DC-DC step up converter. Final prototype was able to charge the phone in 10-12 hours of direct sunlight.
5. Advantages and disadvantages
2.1 Literature survey 1
2.2 Literature survey 2
Solar powered battery charging system, National University of Ireland Galway, Catherine Conaghan
The solar panels voltage would be controlled a DC-DC converter, most likely a
commercial one, and the main circuitry design would be in implementing the mobile phone charging algorithm to charge the mobile phones at the load. It was soon discovered that the charging algorithm for the mobile phones would not be needed as the phones charging algorithms are contained on the phones themselves. However,early research into solar panel powered systems highlighted the need to apply some form of power management to the panel to allow for optimum efficiency.
Paper can be viewed - http://ocw.mit.edu/courses/special-programs/sp-775-d-lab-energy-spring-2011/projects/MITSP_775S11_proj_rptchrg.pdf
Paper can be viewed - http://ohm.nuigalway.ie/0708/cconaghan/Thesis1.pdf
Desert Research Foundation of Namibia and the Gobabeb Training and Reseach Centre.
In late 2006, the DRFN commenced with investigating the feasibility of solar cell phone charging shops as an approach towards establishing Energy Shops in Namibia as specified in Namibia’s Offgrid Energisation Master Plan, 2006. Two shops located in Windhoek’s informal settlement, Havana,has been closely monitored and mentored. The system is capable of charging about 20 cell phones per day and provides daily electricity for 3 hours for each light (replacing the need for candle, paraffin or gas). The system is versatile and can
accommodate any type of cell phone DC charger (car chargers).
2.3 Literature Survey 3
Addition of filters c1 and c2
To reduce the external noise.