Wireless Mobile Charger Circuit Diagram

Wireless Mobile Charging is one of the trending topics in the field of electronics thus we also decided to build a Wireless Mobile Charger Circuit Diagram using various commonly available components. The project Wireless Mobile Charger Circuit Diagram posted here can deliver 271mA at 5.2V so you charge mobile phones and also can be used to drive low power loads such as LED1 and LED2 as shown in figure 2.

Working Principle of Wireless Mobile Charger Circuit Diagram

Wireless Mobile Charger uses the inductive coupling principle. In this principle, two LC-tuned circuits communicate at the same tuned frequency i.e. tuned frequency of the transmitter must be equal to the tuned frequency of the receiver. Here, we had to use LC-tuned to produce and transfer the magnetic field which is received by another LC-tuned circuit.

Circuit Description of Wireless Mobile Charger Circuit Diagram

For simplicity and better description, we have divided Wireless Mobile Charger Circuit Diagram into sections i.e. transmitter circuit and receiver section

Transmitter Circuit for Wireless Mobile Charger Circuit Diagram: –

The transmitter circuit of the Wireless Mobile Charger Circuit Diagram is shown in figure 1 and is built around timer IC 555, a general-purpose NPN transistor BC547, N-channel MOSFET IRF540N, LC-tuned circuit, and a 5-volt series voltage regulator 7805.

Let us first talk about what a tuned circuit is? In the above circuit, we used a tuned collector oscillator (L1 with C1 and C2). The tuned collector oscillator uses a parallel L-C circuit in the collector circuit as the load and this circuit determines the frequency of oscillation. The output voltage developed across the tuned circuit is inductively coupled to the base circuit.

Timer IC 555 is used here for pulse generation thus it is arranged in astable multivibrator mode. The output of IC 555 (pin 3) is connected to the base of the general-purpose transistor T1 which is used to drive the MOSFET T2. The MOSFET T2 is used to switch the L-C tuned circuit which further transmits the oscillating magnetic field.

Series voltage regulator IC2 is used to provide operating voltage for the entire circuit (+5V) from +12V as shown in figure 1.

Receiver Circuit for Wireless Mobile Charger Circuit Diagram: – Receiver circuit shown in figure 2 is built around LC tuned circuit (L2 with C7 and C8), a current regulator (buck and boost) IC MC34063, Schottky diode (1N5819), and a few passive components. The transmitted oscillation magnetic field is detected by L-C tuned build around inductor L2 with capacitors C7 and C8 which is further changed to DC voltage using bridge rectifier BR1 and filtered using capacitors C9 and C10.

The ripple-free DC voltage is now given to buck/boost IC, configured into buck regulator mode. The output voltage is further filtered using an L-C filter and is connected to LED through current limiting resistors R9 and R10.

Receiver Circuit for Wireless Mobile Charger with Female USB Connector: The receiver circuit for the mobile charger shown in figure 3 is a little different than the receiver circuit posted above in figure 2. Both the LED (LED1 and LED2) is replaced by a female USB connector. Connect the female USB as shown in figure 3. VCC (RED wire) is connected to the positive terminal of capacitor C13 where GND (Black wire) is connected to the circuit ground. Both the data pin (D- and D+) is not connected.

receiver circuit for wireless mobile charger

PCB Construction for Wireless Mobile Charger Circuit Diagram: – The actual size solder side PCB design and component side PCB design of the transmitter circuit of the Wireless Mobile Charger Circuit Diagram are shown in figure 3 and figure 4 respectively. Similarly, figure 5 and figure 6 show the solder side and component side of the receiver circuit of the Wireless Mobile Charger Circuit Diagram.

Figure 4: Solder Side PCB of Wireless Mobile Charger Circuit Diagram Transmitter

Figure 5: Component Side PCB of Mobile Charger Circuit Diagram Transmitter

Figure 6: Solder Side PCB of Mobile Charger Circuit Diagram Receiver

Figure 7: Component Side PCB of Mobile Charger Circuit Diagram Receiver

Click Here To Download the PCB Diagram

3d view of wireless mobile charge transmitter circuit

Figure 8: 3D View of Wireless Mobile Charge Transmitter Circuit

3d view of wireless mobile charge receiver circuit

Figure 9: 3D View of Wireless Mobile Charge Receiver Circuit

Math’s involves in Wireless Mobile Charger Circuit Diagram

The entire calculation shown below is done by considering the parts list value in this circuit.

  1. Transmitter Circuit: – As the 555 is wired in an astable multivibrator thus we have to calculate pulse oscillation.

Charging time = 0.693\times (R_1 + R_2) \times C_3

Discharging time = 0.693\times R_2 \times C_3

Oscillating Frequency of 555 =  \dfrac{1.44}{(R_1 + 2R_2)\times C_3} = 18.94 KHz

LC Tuned Frequency  F_T = \dfrac{1}{2\pi \sqrt{LC}}

Where L = L1 = 180µH

C = C1 + C2 = 0.1µF + 0.1µF = 0.2µF

Therefore, F_T = 26.5\ KHz \approx = 26 KHz

  1. Receiver Circuit: –

LC-tuned frequency must be equal to the transmitter-tuned frequency of 26 kHz. Thus,

F_R = \dfrac{1}{2\pi \sqrt{LC}}

Where, L = L1 = 195 µH

C = C7 + C8 = 180nF + 12nF = 192 nF

F_R = 26.010\ KHz \approx 26 KHz

  1. Output Voltage V_O = V_{ref}(1 + \dfrac{R_7}{R_6})

Vref of IC3 = 1.25V

R7 = 15 KΩ

R6 = 4.7 KΩ

Therefore, Output Voltage (VO) = 5.2V

Output Current = 271mA

Power Output =  Volt \times Current = 5V \times 2.71mA = 1.4W

Input Voltage = 12V

Input Current = 180mA

Power Input  = Volt \times Current = 12V \times 180mA = 2.16W

Now, we can calculate  Efficiency = \dfrac{Output\ Power}{Input\ Power} = \dfrac{1.4W}{2.16W} = 68.4%

Note: You can increase the efficiency of the circuit by using a magnetic core instead of an Air Gap as shown in Figure 7.

Figure 8: Magnetic-Code Inductor Coil

PARTS LIST OF WIRELESS MOBILE CHARGER CIRCUIT DIAGRAM

Resistor (all ¼-watt, ± 5% Carbon)
R1, R4 = 1 KΩ

R2, R3 = 3.3 KΩ

R5 = 150 Ω

R6 = 4.7 KΩ

R7 = 15 KΩ

R8 = 0.33 Ω

R9, R10 = 68 Ω

Capacitors
C1, C2 = 0.1 µF (Polyester Capacitor)

C6 = 0.1 µF (Ceramic Disc)

C3, C4, C9 = 0.01 µF (Ceramic Disc)

C5 = 100 µF/25V (Electrolytic Capacitor)

C7 = 180 nF (Polyester Capacitor)

C8 = 12 nF (Polyester Capacitor)

C10, C12, C13 = 220 µF/25V (Electrolytic Capacitor)

C11 = 470 pF (Ceramic Disc)

Semiconductors
IC1 = NE555 (Timer IC)

IC2 = LM7805 (Series Voltage Regulator, 5V)

IC3 = MC34063 (Buck/ Boost Regulator IC)

D1 = 1N5819 (Schottky Diode)

T1 = BC547 (General Purpose NPN Transistor)

T2 = IRF540N (N-Channel MOSFET)

BR1 = DB107 (Bridge Rectifier)

LED1, LED2 = 1-watt LED

Miscellaneous
L1 = 180µH inductor using a 35-turn, 50mm diameter of 26SWG enameled copper wire

L2 = 195µH inductor using a 45-turn, 50mm diameter of 26SWG enameled copper wire

L3 = 220µH Fixed Inductor

CON1 = 2-pin Terminal Connector

Heat Sink for Series Voltage Regulator (7805)

CON2 = Female USB Connector

 

60 Thoughts to “Wireless Mobile Charger Circuit Diagram”

  1. James RR

    Thankyou very much sir.
    i was searching for this projects since long.
    is this projects works.

  2. Shaurya Singh

    has any one done this project for real,as i will be doing this for my collage and so would you like to give me any advice related this project??please reply asap.

    1. The project wireless mobile charger posted here is 100% verified.
      Here in the link below we had posted the author prototype
      https://www.facebook.com/BestEngineeringProjects/posts/1528539337195340

      1. Shaurya Singh

        THANK YOU VERY MUCH
        you made things really clear and simple for me?

      2. Shaurya Singh

        your efforts are very much appreciated

  3. Shaurya Singh

    sir in the output circuit from where do we take output to the cell phone

    1. For output you have to replace both the LEDs (LED1 and LED2) with USB connector where positive terminal is connected to positive leads of capacitor C13 and negative terminal is connected to negative terminal of capacitor C13.

  4. Shaurya Singh

    please help asap

  5. Shaurya Singh

    Thanky sir just one last thing is it possible to convert 220 volt ac to a 12 v 180mA for input in transmitter circuit

  6. Shaurya Singh

    sir how to convert 220v ac to 12 volt 180mA dc in order to supply the transmittor

  7. Shaurya Singh

    Sir con i use 12v 1 amp adaptor as source in the transmitter circuit

  8. Shaurya Singh

    Pleade reply asap please

  9. Shaurya Singh

    My project is stuck with the source part rest of it is sorted please help

    1. What source part can you please elaborate please?
      in the transmitter side you can use 12V 1 amp. adapter or you can make your own 12V power simple 12V power supply.

  10. Shaurya Singh

    Sir in the transmitter circuit can we use 12 volt 1 amp adapter as in the calculations you are saying 12 v 180 ma

    1. The circuit designed here draws 180mA at 12V this doesnot not mean you have to use 12V supply at 180mA.
      Any supply which gives more then 180mA at 12V output can be used here, because any system draw current as per requirement not as per supply. So you can use use adapter of 12V at 1amp.
      if you have any further queries then please summerize all in one comment thankyou.

      1. Shaurya Singh

        Thank you for your quick response.

  11. Shaurya Singh

    Can i call or watsapp you please

  12. Shaurya Singh

    Please help sir it is urgent

  13. Shaurya Singh

    Thank you so much
    You guys are the best

  14. mr .x

    can i use this circuit to charge any phone or specific type of phones. And if i want to charge phone battery to charge an electrical car. is that can be possible ??

  15. Shaurya Singh

    thank you so much sir
    this circuit works well
    thank you for your constant support
    https://uploads.disquscdn.com/images/31ec008fa7ecb1fb8f2b9208d4c2ff265b697ef173eb137004c3d7d530ba5c37.jpg

  16. Viraj Patel

    What is the range of the charger…

    1. Depends upon the coil you have used.

  17. Mohamed Asim

    well documented !! …one question please
    what software did you use for PCB designing ???
    thanks for help….

    1. We had used various type of software like Proteous, Altium ect.

  18. Aiden Chau

    Hello, if i want to use to charge the smartphone. How to increase the receiver side output to 5V 1.5A. Thank you very much

  19. tamizh

    sir what is the range of induction?if we use 37swg instead of 26 swg.shouldthe no.of turns be higher to match the induction.

  20. karthi

    Sir,what is the range (distance) of induction? If we use 37swg instead of 26swg should the no of turns be higher to match the inductance

  21. karthi

    sir how many turns are required if we change the swg to 37 from 26
    how to calculate it sir?

    1. High swg wire means larger cross section area. Thus, used for high current.
      So i suggest you to use 37 SWG of wire.

  22. Anubhav Kumar

    Sir when I give 12 volts power supply to the transmitter circuit the 180uH inductor is getting heated up and there is no power transmission from the transmitter to the receiver circuit.Can u help me in rectify this problem?

    1. please make sure about current rating of your coil.
      Generally coil heat-up due to resistive loss.

  23. alvin

    my mosfet part is not activated. do you know what might be the reason?

    1. At first please check the entire connection, if every this is fine then check whether transistor become on or not by using multimeter. If every thing is fine then your mosfet might have issue replace it.

  24. Jagan Krishnan

    what is value of mutual inductance between the coils sir.

  25. Shahin Shaji

    Hai sir…Can I replace the L3 with some other resistor. That inductor is not available to us…plzz reply I have taken your project for my college mini project…..plz reply

    1. Hello,
      Sorry, you cannot replace inductor with resistor.

  26. Shahin Shaji

    Okk thanks sir for your quick response

  27. Shahin Shaji

    Sir, can i replace L3 220uh fixed inductor with 330uh or 100 uh fixed inductor..please response first sir…

    1. I have not tested it yet, but you can give it a try.
      But, I would recommend you to join two 100uh inductors in series.

  28. Shahin Shaji

    Okk thanks sir..sir that inductor is used for filtering purpose so can i use 150uh…And sir i have tested the transmitter side by giving 12v… but the mosfet is getting very hot. What is the problem. I have checked the circuit and it is very perfect

    1. Please recheck the circuit connection, heating of MOSFET is mainly due to the flow of large current when the gate is not fully opened.

  29. karan r akulwar

    I was selected this as my project and a have completed transmitter side circuit so how can i check that my circuit is working well or not or what is the output voltage at coil terminal by which i can understand my circuit is working
    please help me

    1. It’s better to check the output frequency of the transmitter circuit rather than voltage.

  30. karan r akulwar

    hello sir,
    as i am doing this project i was completed the transmiter and receiver part of wireless charger circuit but i stuck in a problem that my transmitter part is not working as i am not able to measure the output frequency so i measure the voltage but at 1st and 3rd terminal from vcc of IRF540 mosfet shows approximately 12v but at the 2nd terminal (o/p) zero volage shows and it not work properly
    so please help mi sir this is very urgent

  31. karan r akulwar

    hellow sir now my project is working
    but 1 thing i want to ask that what very small noise are coming from my transmitter and can i stop this noise

    1. Glad to know that project is working
      There might be two reasons for noise
      1. There might be piezoelectric effects in ceramic capacitors. This is due to a change in voltage across capacitors (C1 and C2).
      2. Another reason is magnetostriction in an inductor L1.

      Do you use core in inductor L1?
      Because core materials produce humming sound when the magnetic flux density changes.

  32. Pablo

    Please Sir, any video for this project, to serve as a guide. Thanks a lot

  33. Freedom hormics

    Hello sir, this project worked just fine as I used it for my final school project.
    I want to build another with a higher current output, is it the number of turns of coil I need to increase? What other thing should be increased?

  34. DISSNAYAKA DMT

    Sir, We’re doing this as our project for university. We connected everything as indicated here. But the Transmitter circuit output voltage is very small normally but when the heat sink of mosfet i touched it shows a 7V output. What might be the problem and what can we do to fix it? Hoping for a reply asap. Thank you!

  35. DISSANAYAKA DMT

    Sir, We’re doing this as our project for university. We connected everything as indicated here. But the Transmitter circuit output voltage is very small normally but when the heat sink of mosfet i touched it shows a 7V output. What might be the problem and what can we do to fix it? Hoping for a reply asap. Thank you!

  36. Elias Abboud

    is there any way we can the schematics so we can download them and run it

  37. M72

    Hello, good time, I had a question about the coils, how many turns should the coils be wound and what is their diameter??

  38. M72

    I mean the number of twists

  39. samed

    Hello Sir,
    Did you make the card designs using the PCB diagrams available on your website?
    When I did the circuit printing, some of the components did not match the holes.
    Can you help me?
    Thank you so much in advance.

  40. John

    But the transmitter circuits diagram is different with the pcb designed!
    Please which one to follow?

  41. Hello

    Can this transmitter circuit deliver 7 W – 10 W to charge a mobile phone?
    If so ? how many windings does my coil has to have? Or how can I calculate that?

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