1. Wireless Power Transmission and Near Field Communication
國立台北科技大學 電子工程系
林丁丙 教授

2. Outline Introduction Wireless Power Transmission (WPT)
Near Field Communication (NFC)
Wireless Power Transmission
Literature Review
Proposed Design and Parametric Analysis
Near Field Communication
Proposed Design and Theoretical Analysis
Conclusions

3. Outline Introduction Wireless Power Transmission (WPT)
Near Field Communication (NFC)
Wireless Power Transmission
Literature Review
Proposed Design and Parametric Analysis
Near Field Communication
Proposed Design and Theoretical Analysis
Conclusion

4. Why Transmit Power by Wireless Instead of Wire?
Advantages of WPT
Safety
Flexibility
Reliability
Operation Frequency
100 ~ 200 KHz (Short distance)
6.28 MHz and MHz (Middle distance)
0.3~ 300 GHz (Long distance)

5. WPT for Short Distance (1/2)
Operation Frequency：100 ~ 200 KHz
Transmission Distance：Less than 5 cm IP IS
Equivalent Circuit
𝐸 =− ∆Φ ∆𝑡
Faraday’s law
IP：Primary current
IS：Secondary current
H：Magnetic Field
Schematic Diagram

6. WPT for Short Distance (2/2)
Name of Organization：Wireless Power Consortium
Operation Frequency：100 ~ 200 KHz
Output Power：5 ~ 15 W
Charging Methods：Magnetic Field Coupling
Fixed Position
Free Position
(Moving Coil)
Free Position
(Array Coil)

7. Application of WPT for Short Distance
Nokia Lumia 920
Samsung Galaxy S4
Nexus 4

8. WPT for Middle Distance (1/2)
Name of Organization：NFC Forum
Operation Frequency：13.56 MHz
Output Power：Less than 5 W
Charging Methods：Magnetic Field Coupling
Transmission Distance：Less than 50 cm
NFC Antenna
NFC Antenna of New HTC One
Schematic Diagram

9. WPT for Middle Distance (2/2)
Name of Organization：Alliance for Wireless Power
Operation Frequency：13.56 MHz、6.28 MHz
Output Power：20 ~ 50 W
Charging Methods：Magnetic Resonance
Transmission Distance：Less than 2 M
Magnetic Field
Current
Schematic Diagram
Equivalent Circuit

10. WPT for Middle Distance
Application of
WPT for Middle Distance
Sony Z1
NFC
Phone
Speaker
Nokia Lumia 920
Phone
Camera Lens
NFC

11. Schematic Diagram of Microwave Wireless Power Transmission
WPT for Long distance
Operation Frequency：0.3 ~ 300 GHz
Output Power： Less than 0.5 W
Charging Methods：Microwave
Transmission Distance：More than 2 M
Schematic Diagram of Microwave Wireless Power Transmission

12. Outline Introduction Wireless Power Transmission (WPT)
Near Field Communication (NFC)
Wireless Power Transmission
Literature Review
Proposed Design and Parametric Analysis
Near Field Communication
Proposed Design and Theoretical Analysis
Conclusion

13. Efficiency Calculation for WPT
Conversion Efficiency
CE: Conversion Efficiency
𝜼 𝑪𝑬 = 𝑷 𝑫𝑪 𝑷 𝒊𝒏
Total Transmission Efficiency
𝑷 𝒊𝒏 = 𝑮 𝒓 ∙ 𝑮 𝒕 ∙ 𝝀 𝟐 𝟒𝝅𝒅 𝟐 𝑷 𝒕
𝜼 𝒕 = 𝑷 𝑫𝑪 𝑷 𝒕 = 𝑷 𝒊𝒏 𝑷 𝒕 ∙ 𝑷 𝑫𝑪 𝑷 𝒊𝒏 = 𝑷 𝒊𝒏 𝑷 𝒕 ∙ 𝜼 𝑪𝑬

14. Block Diagram for Rectenna
Proposed Rectenna in currently research Zd Za
Za = Zd for maximum power transfer Pi Po
𝐼𝐿=−10log⁡( 𝑃 𝑜 𝑃 𝑖 )
For IL = 0.48 dB
Po = 0.89 x Pi

15. Literature Review for WPT (1/2)
The new dual-diode rectenna can provide at least twice
the dc output voltage than the traditional one

16. Literature Review for WPT (2/2)
Additional matching network is needed for better power transformation
3rd harmonic rejection filter will cause the additional loss
Matching Network

17. Proposed DCP Rectenna (1/3)
Proposed dual circularly polarized rectenna with high-order harmonic rejection property
From View
Bottom View
Side View