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
Outline
Introduction

Wireless Power Transmission (WPT)

Near Field Communication (NFC)
Wireless Power Transmission

Literature Review

Proposed Design and Parametric Analysis
Near Field Communication

Literature Review

Proposed Design and Theoretical Analysis
Conclusions
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Outline
Introduction

Wireless Power Transmission (WPT)

Near Field Communication (NFC)
Wireless Power Transmission

Literature Review

Proposed Design and Parametric Analysis
Near Field Communication

Literature Review

Proposed Design and Theoretical Analysis
Conclusion
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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 13.56 MHz (Middle distance)

0.3~ 300 GHz (Long distance)
[1] Z. Yuwei, H. Xueliang, T. Linlin, B. Yang and Z. Jianhua, “Current research situation and developing tendency
about wireless power transmission,” in Proc. 2010 Int. Conf. Electrical and Control Engineering, pp. 3507-3511.
[2] Wireless Power Consortium
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WPT for Short Distance (1/2)
Operation Frequency：100 ~ 200 KHz
Transmission Distance：Less than 5 cm
Faraday’s law
∆Φ
𝐸=−
∆𝑡
IS
IP
Equivalent Circuit
IP：Primary current
IS：Secondary current
Schematic Diagram
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H：Magnetic Field
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
Free Position
(Moving Coil)
(Array Coil)
[1] Z. Yuwei, H. Xueliang, T. Linlin, B. Yang and Z. Jianhua, “Current research situation and developing tendency
about wireless power transmission,” in Proc. 2010 Int. Conf. Electrical and Control Engineering, pp. 3507-3511.
5/32
[2] Wireless Power Consortium (http://www.wirelesspowerconsortium.com).
Application of
WPT for Short Distance
Samsung Galaxy S4
Nokia Lumia 920
[1] Z. Yuwei, H. Xueliang, T. Linlin, B. Yang and Z. Jianhua, “Current research situation and developing tendency
Nexus 4
about wireless power transmission,” in Proc. 2010 Int. Conf. Electrical and Control Engineering, pp. 3507-3511.
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[2] Wireless Power Consortium (http://www.wirelesspowerconsortium.com).
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
Schematic Diagram
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NFC Antenna of New HTC One
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
Current
Transmission Distance：Less than 2 M
[1] Z. Yuwei, H. Xueliang, T. Linlin, B. Yang and Z. Jianhua, “Current research situation and d
Magnetic
about Field
wireless power transmission,”
in Proc. 2010 Int. Conf. Electrical and Control Engineeri
[2] Wireless Power Consortium (http://www.wirelesspowerconsortium.com).
[3] NFCDiagram
Forum (http://nfc-forum.org/).
Schematic
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Equivalent Circuit
[4] Alliance for Wireless Power (http://www.rezence.com/).
Application of
WPT for Middle Distance
NFC
Phone
Speaker
Sony Z1
Phone
Camera Lens
NFC
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Nokia Lumia 920
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
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Outline
Introduction

Wireless Power Transmission (WPT)

Near Field Communication (NFC)
Wireless Power Transmission

Literature Review

Proposed Design and Parametric Analysis
Near Field Communication

Literature Review

Proposed Design and Theoretical Analysis
Conclusion
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Efficiency Calculation for WPT
Conversion Efficiency
CE: Conversion Efficiency
𝜼𝑪𝑬
Total Transmission Efficiency
𝑷𝑫𝑪 𝑷𝒊𝒏 𝑷𝑫𝑪 𝑷𝒊𝒏
𝜼𝒕 =
=
∙
=
∙ 𝜼𝑪𝑬
𝑷𝒕
𝑷𝒕 𝑷𝒊𝒏
𝑷𝒕
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𝑷𝒊𝒏
𝑮𝒓 ∙ 𝑮𝒕 ∙ 𝝀𝟐
=
𝑷𝒕
𝟒𝝅𝒅 𝟐
𝑷𝑫𝑪
=
𝑷𝒊𝒏
Block Diagram for Rectenna
Proposed Rectenna in currently research
Za Zd
Za = Zd for maximum power transfer
Pi
Po
𝑃𝑜
𝐼𝐿 = −10log( )
𝑃𝑖
For IL = 0.48 dB
Po = 0.89 x Pi
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Literature Review for WPT (1/2)
The new dual-diode rectenna can provide at least twice
the dc output voltage than the traditional one
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Literature Review for WPT (2/2)
Additional matching network is needed for better power
transformation
3rd harmonic rejection filter will cause the additional loss
[1] Z. Yuwei, H. Xueliang, T. Linlin, B. Yang and Z. Jianhua, “Current research situation and developing tendency
about wireless power transmission,” in Proc. 2010 Int. Conf. Electrical and Control Engineering, pp. 3507-3511.
[2] Wireless Power Consortium (http://www.wirelesspowerconsortium.com).
[3] NFC Forum (http://nfc-forum.org/).
[4] Alliance for Wireless Power (http://www.rezence.com/).
[5] Y. J. Ren and K. Chang, “5.8-GHz circularly polarized dual-diode rectenna and rectenna array for microwave
Matching
Network
power transmission,”
IEEE Trans. Microw. Theory Tech., vol. 54, no. 4, 2006, pp. 1495-1502.
[6] C. H. Chin, Q. Xue and C. H. Chan, “Design of a 5.8-GHz Rectenna Incorporating a New Patch Antenna,”
IEEE Antenna and Wireless Propagat. Letter, vol. 4, 2005, pp. 175-178.
[7] T. C. Yo, C. M. Lee, C. M. Hsu and C. H. Luo, “Compact Circularly Polarized Rectenna With Unbalanced
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Circular Slots,” IEEE Trans. Antennas and Propag., vol. 56, Mar. 2008, pp. 882-886.
Proposed DCP Rectenna (1/3)
Proposed dual circularly polarized rectenna with high-order
harmonic rejection property
From View
Bottom View
Side View
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