DIY-wireless charging circuit make yourself!

     Since i have posted an article about wireless charging i am interested in posting an article that makes the readers to understand wireless transfer of chargers in a real time do it yourself experience.
Click here to view the article about wireless charging-theory based explanation.
      This is a simple circuit which  can power up a LED without any wires, at a distance of almost 3 centimeters. This circuit acts as both, step up Voltage converter and also wireless electricity transmitter and receiver.This project is easy to learn and to implement it, and it also a interesting to show to your family that i made a wireless power transfer circuit, etc.. Follow the steps carefully it i made it very simple to understand.
 CLICK HERE TO KNOW THE WORKING OF THIS CIRCUIT

MATERIALS REQUIRED:

1. NPN TRANSISTOR-(2N3904)
2. RESISTOR-(1KΩ)
3. LED
4. 1.5 OR 9V D.C BATTERY
5. COPPER WIRE

TOOLS NEEDED:

1. SOLDERING IRON
2. SOLDERING LEAD
3. SCISSORS OR KNIFE
4. CANDLE OR LIGHTER

MATERIALS USED:

• 2N3904-NPN TRANSISTOR- As the name says it is a transistor of npn type in which the base is made of p-type material whereas the emitter and collector are n-type semiconductor. We can also use PNP type transistor the only change is we want to change the direction of the circuit.  BC 547 and BC337 is also recommended to use.
• RESISTOR- As the name says a device which resists the current flow or the flow of electrons in a conductor is called resistor.  The value of resistor we needed in this project is 1KΩ.
• LED- light emitting diode emits light when current flows through it. Two led's are recommended to carry just in case one fails.
• COPPER WIRE- A copper wire is used to make coil such that electromagnetic induction can be created to transfer the flux in the primary coil. We can find these type of wires in your household wiring systems or in a broken small transformer or a motor.  A wire of medium thickness not greater than 1.5mm radius is preferred.
• BATTERY:  Battery acts as a power source to glow the led.  The more the voltage of the source the more brighter the led is and can transmit upto 2 inches in air.  Also do not use very high voltage because the transistor wont take that much voltage,which is very sensitve.

 CIRCUIT DIAGRAM:

CONNECTING STEPS:

SHORT PROCEDURE:

1. Take a round object such that we can make a magnetic coil of 30 turns and check whether the receiver key is only the key for time.
2. Tie knots on each end of the coil wire which ensures coil wont get unoiling and unresting itself.
3. Make the transmission cable by initially wounding 15 turns and then making a tap continued by another 15 turns of the coils.
4. Burn on the insulator forming up of an oscillator. 
5. 2 ends - coil A
6. 3 ends- coil B.
7. Connect the base of the transformer to any one end of the coil and come here.
8. connect the collector to another free end of the existing coil.
9. If you want solder a little bit of wire from emitter.
10. COIL-A - LED
11. TRIM EXCESS +VE AND LEAD EXTENSIONS
12. TAP OF TRANSMITTER COIL,  +VE
13. THE SOURCE IS MEASURED IN EMITTER. 

STEP 1:

          First analyze the given schematic circuit diagram. The diagram consists of two separate circuit which includes the transmitter circuit and the receiver circuit.  In the transmitter side the voltage and current source- the battery's positive side is connected to the one end of the coil and the other is connected to the emitter side of the transistor.  the base region of the transistor is fused with the resistor of range one kilo ohm.  A center tapped construction is used in coil construction.

STEP 2:

         The first challenging procedure is the making of two coils i.e for the transmitting part and the receiving part.  For the receiving part it is easy, take a round surfaced object and circle 30 turns of copper wire and then twist the last turn around the coil to ensure it won't got loosen. The receiver's coil is very simple which has two copper outlets, In which one is the transmitter and the other is the receiver.  For the transmitter side you are going to make a center tapped coil wounding where you should take the same volume that the receiving side is made.  At first wound 15 turns and tap with a coil loop hanging other programs for diagnozing error  and wound the rest of the fifty turns.

STEP 3:
          Making the transmitter: Take the transistor, and place it so that the flat side is facing up and the leads are facing towards you. The lead on the left is the Emitter, the lead in the middle is Base, and the lead in right is the Collector. Take the resistor and connect one of its ends to the base of the transistor. Take the other end of the resistor and connect it one of the ends (not the tap) from Coil B. Take the other end from Coil B and connect it to the Collector of the transistor. If you want you could connect a small piece of wire to the Emitter of the transistor (It would work as an extension of the Emitter.)  CLICK HERE TO KNOW THE WORKING OF THIS CIRCUIT.

Troubleshooting
             So this are the variations of problems you may face, and how to fix them:
 1) Problem: The transistor becomes too hot!
Solution: Did you use a resistor of the right value? I didn't use a resistor the first time, and it started to smoke. If it does not solve the problem, then try using a heat shrink or using a transistor with higher amp rating.

2)Problem: The light does not light up!!
Solution: The problem is too broad. There could be many reasons behind the problem. But first check the connections. I accidentally swapped the Base and Collector connections, which caused a big problem for me. So check you connection first. If you have a multimeter check to see if you have continuity between your connections. Also make sure that the coils are of the same diameter. Also be careful there no shorting in the circuit.
I don't know about any more problems. But if you are facing some other problems, let me know! I will try to help as much as I can. Also I am a 2nd year eee student, so my scientific knowledge is extremely limited, and so if I make any mistakes, help me find it out. Suggestions for improvements are more than welcome.  THen fiz the led we are going to arth is destiny.

CLICK HERE TO KNOW THE WORKING OF THIS CIRCUIT



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About Sooriyamathy

This blog is created to explain people the concepts, which they are finding difficult to understand in electrical and electronics world. This blog also post stuff related to stargazing.