Wireless power transfer is an emerging technology in power electronics. the day to day consumption of petroleum product increases.so a new method for the public service is through electric vehicle. There is wired transferring electric vehicles are available,but they have a disadvantage of safety.Here in wire less power transmission the power transfer through induction. but the main problem is the accurate positioning of vehicle on the charging station. that will be corrected in the next ppt.

1. BATTERY CHARGER FOR ELECTRIC VEHICLES
BASED ON WIRELESS POWER TRANSMISSION
Presented by: SWATHI M
NAIR

2. SYNOPSIS
• Wireless power transfer(WPT)
• Introduction
• Block diagram
• Transformer EEC
• Specification linked to EV
• Compensation Topologies
EOC
COC
• Result
• Conclusion
• References

3. INTRODUCTION
• Recharging of batteries for e-vehicles
• WPT is also known as ICPT
• Principle: Electromagnetic induction
• More advantageous than any other system.
• Promote the e-vehicles
• ICPT battery charging system
• Main objectives are a) Enhancing the power transfer efficiency
b) Decreasing the charging time

4. PROPOSED SYSTEM
WIRELESS POWER TRANSFER FOR E-VEHICLES
• Principle: induction concept
• Wireless charging station
• Park and leave concept of vehicles
• Power transfer without using power cables
• Uses electric supply to drive vehicles

5. BLOCK DIAGRAM

6. TRANSFORMER EEC
SPECIFICATIONS LINKED TO EV
1. Battery management
2. Battery model
3. Ease of control and inter-operability
4. Shielding.

7. 1. BATTERY MANAGEMENT
• First through constant current mode and followed by constant voltage
mode

8. 2. BATTERY MODEL
• To recharge batteries a heavy frequency AC voltage
• Relation between battery voltage and transformer output voltage
• The equivalent resistance RL is given by

9. 3. EASE OF CONTROL AND INTER-
OPERABILITY
• Transformers Capacitive compensation is mainly to optimize WPT
efficiency.
i.e..,
• Compensation topologies are for to compensate the leakage energy
stored in the coil.
• Operating conditions may vary widely since coreless transformers are
used
• Inter operability may a success key in this felid

10. 4. SHIELDING
• Leakage flux is dominant in air transformer
• Equip charging devices with a specific shielding.
• Shielding is introduced to reduce joule loss
• Structure includes ferrite plate ,Al shorted turns, and an iron plate, coil

11. COMPENSATION TOPOLOGIES
• Leakage flux in a transformer leads to a low power factor
• Capacitances are usually combined with the transformer in order to
compensate the leakage energy stored in the coils
• Widely used compensation topologies are

12. Continued…
• Methodologies to find C1 and C2
1. EOC-EFFICIENCY ORIENTED COMPENSATION
2. COC-CONTROL ORIENTED COMPENSATION

13. 1. EFFICIENCY ORIENTED COMPENSATION
• First calculate Z2 and then Z1
• For serial-serial topology
Behaves as a current source
• For serial-parallel topology
Behaves as a voltage source

14. ANALYSIS IN A AIR CORE TRANSFORMER
• Size of transformer
 Primary coil - 600 x 600 mm2 (dotted lines)
 Secondary coil - 400 x 400 mm2
 Air-gap - 260 mm.

15. CONTINUED…
• Merging two characteristics in a single graph
• Slope of SP topology characteristics should
be zero
• Slope of SS topology characteristics should
be infinite
• Theoretical and measured voltage-current characteristic slope (or ΔU/ΔI)
values are shown

16. DUAL TOPOLOGY
• Combining SS &SP topology using relays in the secondary part, the
inverter can be simply turned to a voltage source or current source.
• Displayed position is SS topology
• Dotted position shows SP topology

17. INVERTER SIMULATION CIRCUIT

18. INVERTER OUTPUT

19. 2. CONTROL ORIENTED COMPENSATION
• It is not to maximize the efficiency of the transformer, but to
simplify its control.
• Compensation capacitances are independent of transformer
parameters.
• Design of primary part and one of the secondary part are not
provided by the same developer.
• It leads to inter operability between components.
• Primary side solutions are less sensitive to secondary side.

20. COMPARISON OF EOC AND COC
• The WPT is tuned with a load of 30W. Then, it is loaded with
RL = 4W. The inverter voltage Uinv is plotted below
• WPT is detuned with the efficiency-oriented compensation
• COC method leads to no change of the waveform that remains a rectified
sine wave

21. CONTINUED…
 COC is no longer efficiency, the
transformer's primary current increases in
an expected manner.
The phenomenon is true only for low load
resistance values
COC method tends to increase the
primary
 current at high load, the output power
is also increased

22. RESULT
• A key point is to verify that the efficiency is not decreased using the
methodology

23. CONCLUSION
• Robustness of control
• simplicity and reliability
• Decreased battery charging time(cycle)
• Inter-operability, or standardization
• Dual-topology ICPT allows to greatly simplify the embedded electronics
by suppressing a DC/DC converter.
• Control-Oriented Compensation enhances the functioning independent
of parameters

24. ADVANTAGES
• The advantages are multiple.
• First, in high voltage transfer, security level is increased because
• simplicity of use (no handling, no plugging),
• safety for users(no electrical hazard, no sparkle risks)
• reliability (no wear, no mechanical fitting)

25. REFERENCES
• [1] J. Shin, S. Shin, Kim, Y., Ahn, S., Lee, S., Jung, G., ... & Cho, D. H., “Design and
implementation of shaped magnetic-resonance-based wireless power transfer system for
roadway-powered moving electric vehicles,” IEEE Trans. on Industrial electronics, V.61, N.3,
2014, pp. 1179-1192,.
• [2] O. H. Stielau and G. A. Covic, “Design of loosely coupled inductive power transfer
systems,” Proc. Int. Conf. Power Syst. Technol., Vol. 1, Dec. 2000, pp. 85–90.
• Tesla Motor charging time calculator, url: https://www.teslamotors.com /models-
charging#/calculator.
• [9] Bruno Siciliano, et al. Robotics: modelling, planning and control. Springer Science &
Business Media, 1st ed. 2010.
• [10] Hassan Zargarzadeh, Sarangapani Jagannathan, and James A. Drallmeier. "Extremum-
seeking for nonlinear discrete-time systems with application to HCCI engines." 2014 American
Control Conference. IEEE, Jun 2014, pp. 861-866.

26. Thank You!