1. By Abner Molina UTA REU Summer 2013 Group: Dr. Chiao Midterm Presentation Date: 7/9/2013 WIRELESS POWER TRANSMISSION

2. OVERVIEW Experimental Objective Introduction Background Information Materials Procedure Data/Observations Results Conclusion

3. EXPERIMENTAL OBJECTIVE Increase efficiency of wireless power being transmitted through: Different design of antennas (repeaters) Different circuitry: Class E amplifier Phase lock loop (PLL)

4. INTRODUCTION Done by Peter Woods

5. BACKGROUND INFORMATION University of Hong Kong conducted study in Mid-Range Wireless Power Transfer With: 2-coil systems 4-coil systems Coils used in study were all radial[1] Goal is coming up with a better design

6. BACKGROUND INFORMATION Designs: Repeater 1: Inductance93.36 μH Outer Radius18 cm Inner Radius5 cm Spacing0.5 cm

7. BACKGROUND INFORMATION Repeater 2: Inductance40.74 μH Outer Radius18 cm Inner Radius14 cm Spacing0.5 cm

8. BACKGROUND INFORMATION Repeater 3: Inductance28.72 μH Outer Radius18 cm Inner Radius5 cm Spacing1 cm

9. BACKGROUND INFORMATION Repeater 4, Reciever, Transmitter: Inductance176.3 μH Outer Radius18 cm Turns10

10. BACKGROUND INFORMATION Class E Amplifier RF choke allows DC current to flow when switch on Blocks AC signals when switch off Shunt capacitor charges and discharges in on-off cycle Tuning allows fundamental sinusoid to appear at ouput [2 ] Tuning allows circuit to be at resonating frequency Max power

11. BACKGROUND INFORMATION Class E Amplifier [2]

12. MATERIALS Litz Wire Antenna Frame Capacitors Oscilloscope Function Generator DC Power Supply

13. PROCEDURE Set Up

14. DATA/OBSERVATIONS (40 CM)

15. DATA/OBSERVATIONS (60 CM)

16. DATA/OBSERVATIONS (80 CM)

17. RESULTS 40 CM Repeater 1 produce higher efficiency 60 CM Repeater 1 produce higher efficiency 80 cm Repeater 3 produce higher efficiency

18. CONCLUSION Repeater 1 produced higher efficiency for: 40 cm 60 cm Repeater 3 produced higher efficiency for 80 cm Test designs using PLL Using new Litz wire Produce more control experiments Incorporate LABView for precise results

19. ACKNOWLEDGMENTS [1] Lee, C.K.; Zhong, W.X.; Hui, S.Y.R., "Recent progress in mid-range wireless power transfer," Energy Conversion Congress and Exposition (ECCE), 2012 IEEE, vol., no., pp.3819,3824, 15-20 Sept. 2012 doi: 10.1109/ECCE.2012.6342288 [2] Tao Wang. “Optimized Class-E RF Power Amplifier Design in Bulk CMOS.” ProQues, 2007. Web.

20. ANY QUESTION?