▌01 無線充電系統
1.背景
在昨天(2021-02-09)無線充電系統的功率與效率 的文章在 公眾號(TSINGHUAZHUOQING) 發出之后，張斌 給出了兩點建議：
- 諧振電容要用c0g的，而且要注意電壓電流應力，不能用x7r，其容值會變，串串補漏感和自感都可以，發射端用LCC補償，可實作有無接收端時發射線圈都恒流，更適合比賽，現在ev無線充電也是這樣做的，
- 利茲線的漆包要燙透（不冒黑色泡為止，沾松香水后用錫爐燙更好），否則線圈的阻會影響效率，無線充電系統有個最優負載的概念，大家可以查查文獻，耦合系數k，線圈的交流阻，最優負載，三個主要因素直接影響效率，
其中關于功率部分采用LCC拓撲結構可以在無負載情況下形成輸出恒流的特性會提高系統在運行動態程序中的可靠性，下面通過查找相關論文進行綜述研究，
相關實驗研究：
- 100W無線電耦合功率測驗實驗
2. 研究論文：
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An Optimizable Circuit Structure for High-Efficiency Wireless Power Transfer
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Applying LCC Compensation Network to Dynamic Wireless EV Charging System
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The Design and Optimization of a Wireless Power Transfer System Allowing Random Access for Multiple Loads
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List itemHigh-efficiency wireless power transfer by optimal load and metamaterial slab
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Measuring Wireless Charging Efficiency In the Real World
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Wireless charging efficiency: how to measure in the real world
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Wireless Power Transfer – The Jockeying For Leadership PositionFor Industry Standards Has Begun!
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A Double-Sided LCC Compensation Network and Its Tuning Method for Wireless Power Transfer
注意：很多的文章只能夠在清華校內網路上從ieeexplore.ieee.org上下載下來，
▌02 Paper Review
1. An Optimizable Circuit Structure for High-Efficiency Wireless Power Transfer
Paper Link:An Optimizable Circuit Structure for High-Efficiency Wireless Power Transfer
（1）Scaling Factor
- Using word “shunt” refer to parallel .
- Define the scaling factor: relative distance
s c a l i n g ?? f a c t o r = t r a n s f e r ? d i s tan ? c e c o i l ?? d i a m e t e r ?? scaling\,\,factor = {{transfer\,dis\tan ce} \over {coil\,\,diameter\,\,}} scalingfactor=coildiametertransferdistance?
▲ Mixed-resonant coupleing circuit with its three degenerated forms
（2）Using Scatter Factor
▲ Scatter Parameter Definition
Definition of S21:
∣ S 21 ∣ = 2 ? V L V S ? ( R s R L ) 1 2 \left| {S_{21} } \right| = 2 \cdot {{V_L } \over {V_S }} \cdot \left( {{{R_s } \over {R_L }}} \right)^{{1 \over 2}} ∣S21?∣=2?VS?VL???(RL?Rs??)21?
Power Efficiency : η = ∣ S 21 ∣ 2 \eta = \left| {S_{21} } \right|^2 η=∣S21?∣2
⊙ Applying LCC Compensation Network to Dynamic Wireless EV Charging System
Applying LCC Compensation Network to Dynamic Wireless EV Charging System
▲ Diagram of symmetrical T-compensated network
（1）T-symmetrical compensated network
Input resistance:
Z
i
=
X
2
Z
0
Z_i = {{X^2 } \over {Z_0 }}
Zi?=Z0?X2?
Load Current:I0
I
0
=
U
i
j
X
I_0 = {{U_i } \over {jX}}
I0?=jXUi??
When Z is one mutual inductance, we can substitude the second coil as reflect resistance, which value is :
Z r = ( ω M ) 2 Z 2 Z_r = {{\left( {\omega M} \right)^2 } \over {Z_2 }} Zr?=Z2?(ωM)2?
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Parameters:
-
M: Mutual inductance;
ω \omega ω: radian(Angular, Circular) frequency;
Z 2 Z_2 Z2?: The second turns load.
（2）設計副邊補償網路
▲ 接收線圈等效電路
- 根據最優接收效率設計：
首先根據對稱T型補償電路公式， Z i = X 2 Z 0 Z_i = {{X^2 } \over {Z_0 }} Zi?=Z0?X2?，假設 Z i = R L _ O P T _ η Z_i = R_{L\_OPT\_\eta } Zi?=RL_OPT_η?， Z 0 = 8 / π 2 ? R L Z_0 = 8/\pi ^2 \cdot R_L Z0?=8/π2?RL?（全橋整流負載），那么 X s = R L _ O P T _ η ? 8 π 2 R L X_s = \sqrt {R_{L\_OPT\_\eta } \cdot {8 \over {\pi ^2 }}R_L } Xs?=RL_OPT_η??π28?RL? ?
根據文章中（A6）大體確認：
R L _ O P T _ η = ω M R P 2 R P 1 ≈ ω M R_{L\_OPT\_\eta } = \omega M\sqrt {{{R_{P2} } \over {R_{P1} }}} \approx \omega M RL_OPT_η?=ωMRP1?RP2?? ?≈ωM
這部分參見下面閱讀的文章中的討論，
因此：
（3）設計原邊補償網路引數
▲ 發送線圈補償網路示意圖
其中副邊反射電阻在負載等于最佳效率電阻式對應： R r e f a v = ω M R_{refav} = \omega M Rrefav?=ωM
Step1： Determine the Irq:
I r q = P o u t / η e R r e f I_{rq} = \sqrt {P_{out} /\eta _e R_{ref} } Irq?=Pout?/ηe?Rref? ?
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Argument:
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Pout: Output power;
η \eta η: Primary to secondary coil efficiency
Rref: Equvalent reflect resistance from receive coil
Step2: Determine Xp:
X
p
=
U
i
I
r
q
X_p = {{U_i } \over {I_{rq} }}
Xp?=Irq?Ui??
其中: α , β \alpha ,\beta α,β可以取1來進行計算，
2. Maximum Energy Efficiency Tracking for Wireless Power Transfer Systems
- Maximum Energy Efficiency Tracking for Wireless Power Transfer Systems
Review Detail: Review: Maximum Energy Efficiency Tracking for Wireless Power Transfer Systems
3.A Double-Sided LCC Compensation Network and Its Tuning Method for Wireless Power Transfer
A Double-Sided LCC Compensation Network and Its Tuning Method for Wireless Power Transfer
（1） Contents
- A theoretical analysis of double-sided LCC compensation
- ZVS tuning method
- Design method and Experimental.
▲ Double-Sided LCC compensation Topology
▌結論
■ 相關文獻鏈接:
- 無線充電系統的功率與效率
- 公眾號(TSINGHUAZHUOQING)
- 100W無線電耦合功率測驗實驗
- Applying LCC Compensation Network to Dynamic Wireless EV Charging System
- The Design and Optimization of aWireless Power Transfer System Allowing Random Access for Multiple Loads
- List itemHigh-efficiency wireless power transfer by optimal load and metamaterial slab
- 100W無線充電方案文獻調研 - 資訊HUB
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標籤：區塊鏈
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