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Wireless mobile charging by Inductive Coupling.


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Wireless mobile charging by Inductive Coupling.

  1. 1. Wireless Charging Circuit Using Inductive Coupling BY:- Siddhant Singh
  2. 2. Overview What is wireless power transmission(WPT)? Why is WPT? History of WPT Types of WPT ◦ Techniques to transfer energy wirelessly Advantages and disadvantages Applications Conclusion 11/2/14 Wireless Power References Transmission 2
  3. 3. What is WPT? The transmission of energy from one place to another without using wires Conventional energy transfer is using wires But, the wireless transmission is made possible by using various technologies 11/2/14 Wireless Power Transmission 3
  4. 4. Why WPT? Reliable Efficient Fast Low maintenance cost Can be used for short-range or long-range. 11/2/14 Wireless Power Transmission 4
  5. 5. History Nikola Tesla in late 1890s Pioneer of induction techniques His vision for “World Wireless System” The 187 feet tall tower to broadcast energy He managed to light 200 lamps from a distance of 40km 11/2/14 Wireless Power Transmission 5
  6. 6. Energy Coupling The transfer of energy ◦ Magnetic coupling ◦ Inductive coupling Simplest Wireless Energy coupling is a transformer 11/2/14 Wireless Power Transmission 6
  7. 7. Inductive coupling Primary and secondary coils are not connected with wires. Energy transfer is due to Mutual Induction 11/2/14 Wireless Power Transmission 7
  8. 8. An example 11/2/14 Wireless Power Transmission 8
  9. 9. Block Diagram of circuit 11/2/14 Wireless Power Transmission 9
  10. 10. Description of diagram 11/2/14 Wireless Power Transmission 10 Works on the principle of inductive coupling Contains two sections-The Transmitter section and the Receiver section Transmitter coil converts the DC power to high frequency AC signal Receiver coil receives the power and convert it into AC signal
  11. 11. Transmitter Section 11/2/14 Wireless Power Transmission 11
  12. 12. Transmitter Section Description  DC power Source: It consists of a step down transformer that step downs the supply voltage to a desired level, and a rectifer circuit convert that AC voltage to DC signal Oscillator Circuit: A modified Royer Oscillator circuit is used in our project. With this circuit we can easily achieve a high oscillating current for the transmitter coil. Two N channel enhancement power MOSFET are 11/2/used 14 Wireless Power Transmission Two chokes (L1 & L2) are used 12
  13. 13. Transmitter Section (cont…) the transmitter coil L(inductor)  resistors R1,R2,R3 and R4 (works as a biasing network for Q1&Q2)  The operating frequency of the oscillator is determined by the resonance formula given below F = ½ × π × √ (LC) The equation for finding the inductance 11/2/of 14 a single Wireless layer Power air core coil is given below. Transmission 13
  14. 14. Recevier Section 11/2/14 Wireless Power Transmission 14
  15. 15. Reciver Section Description consists of receiver coil  rectifier circuit and a voltage regulator IC. The rectifier circuit in the receiver section converts this AC voltage in to DC Voltage control IC helps to provide a constant limited regulated output voltage to the load for charging 11/2/14 Wireless Power Transmission 15
  16. 16. Recevier section (cont….)  LM 7805 voltage regulator IC is used  The IC gives a regulated 5V as its output It don’t allow more than 5V to the output. Copper wire having diameter of 8cm is used. equation for finding the inductance of a single layer 11/2/14 air core Wireless coil is Power given below Transmission 16
  17. 17. Advantages of near-field techniques No wires No e-waste Need for battery is eliminated Efficient energy transfer using RIC Harmless, if field strengths under safety levels 11/2/14 Wireless Power Transmission Maintenance cost 17
  18. 18. Disadvantages Distance constraint Field strengths have to be under safety levels Initial cost is high In RIC, tuning is difficult High frequency signals must be the supply Air ionization technique is not feasible 11/2/14 Wireless Power Transmission 18
  19. 19. Applications Near-field energy transfer ◦ Electric automobile charging  Static and moving ◦ Consumer electronics ◦ Industrial purposes  Harsh environment Far-field energy transfer ◦ Solar Power Satellites ◦ Energy to remote areas ◦ Can broadcast energy 11/2/14 globWalilryel e(sins Pfuowtuerr e) Transmission 19
  20. 20. Conclusion Transmission without wires- a reality Efficient Low maintenance cost. But, high initial cost Better than conventional wired transfer Energy crisis can be decreased Low loss In near future, world will be completely wireless 11/2/14 Wireless Power Transmission 20
  21. 21. References S. Sheik Mohammed, K. Ramasamy, T. Shanmuganantham,” Wireless power transmission – a next generation power transmission system”, International Journal of Computer Applications (0975 – 8887) (Volume 1 – No. 13) Peter Vaessen,” Wireless Power Transmission”, Leonardo Energy, September 2009 11/2/14 Wireless Power C.C. Leung, T.P. Chan, Transmission K.C. Lit, K.W. 21
  22. 22. THANK YOU! 11/2/14 Wireless Power Transmission 22