【摘要】：無線電能傳輸(Wireless Power Transfer,WPT)技術(shù),是一種使用電磁場為傳能媒介,從而實現(xiàn)電能在空間上無線傳輸?shù)募夹g(shù)。它植根于控制技術(shù)、電力技術(shù)和電子技術(shù)這三門技術(shù)領(lǐng)域,一直受到研究者的密切關(guān)注。通過WPT技術(shù)能避免用電設(shè)備和供電端的電氣接觸,確保了供電體系的穩(wěn)定性和安全性。在磁場型WPT系統(tǒng)中,處于松耦合狀態(tài)的發(fā)射線圈和接收線圈實現(xiàn)了能量的傳遞,加之補償電路的存在,整個系統(tǒng)是一個復(fù)雜的高階非線性系統(tǒng)。為了提高系統(tǒng)的傳能能力,需確保系統(tǒng)運行在高頻條件下,此時系統(tǒng)對頻率變化十分敏感。實際應(yīng)用中,線圈相對移動導(dǎo)致的互感變化和負載變化都可能對系統(tǒng)的諧振匹配造成影響,從而導(dǎo)致諧振頻率的漂移等問題,這對電路的功率傳輸?shù)燃壓托识加惺謬乐氐挠绊�。如何通過控制和電路方式解決系統(tǒng)對互感和負載變化的頻率敏感性,提升工作頻率的穩(wěn)定度十分具有研究價值。本文針對于此提出了在系統(tǒng)中采用LLC復(fù)合諧振電路的方法。本文圍繞WPT系統(tǒng)中補償電路的研究,主要做了以下的工作:(1)介紹了WPT系統(tǒng)中諧振補償電路的作用,介紹了基本的諧振拓撲,并分析了已有拓撲的一些特點,然后提出了應(yīng)該采用的復(fù)合諧振拓撲模式,并提出采用LLC復(fù)合諧振拓撲這一方案。(2)提出了一種具有雙邊LLC復(fù)合諧振結(jié)構(gòu)的WPT系統(tǒng),詳細分析了其諧振條件及相應(yīng)的證明過程。用阻抗模型對系統(tǒng)進行了詳細的分析,得到了系統(tǒng)所具有的特性,并推導(dǎo)出了相應(yīng)的輸出表達和功率表示。(3)針對雙邊LLC結(jié)構(gòu)過于復(fù)雜這一缺點,提出了S-LLC型簡化拓撲,從阻抗模型驗證了該拓撲依舊具有雙邊LLC系統(tǒng)具有的頻率特性,并推導(dǎo)了此時的系統(tǒng)輸出表達,并提出了一種可運用于該系統(tǒng)的移相控制方式。(4)對LLC復(fù)合諧振拓撲引入后的系統(tǒng)參數(shù)設(shè)計與優(yōu)化進行了概括的分析,說明了并聯(lián)電感Lm和負載取值在非理想?yún)?shù)條件下對系統(tǒng)性能的影響,并給出了一個比較合理的參數(shù)取值范圍。(5)根據(jù)分析的S-LLC系統(tǒng)的輸出特性和控制進行了仿真和實驗來驗證相關(guān)理論推導(dǎo)特性。
[Abstract]:Radio energy transmission (Wireless Power Transfer,WPT (Radio Energy Transmission) technology is a kind of technology which uses electromagnetic field as energy transmission medium to realize wireless transmission of electric energy in space. It is rooted in the three technical fields of control technology, power technology and electronic technology, and has been paid close attention by researchers. Through WPT technology, the electrical contact between electrical equipment and power supply terminal can be avoided, and the stability and safety of power supply system can be ensured. In the magnetic field WPT system, the transmitting coil and the receiving coil in the loose coupling state realize the energy transfer, coupled with the existence of the compensation circuit, the whole system is a complex high-order nonlinear system. In order to improve the energy transmission ability of the system, it is necessary to ensure that the system runs under the condition of high frequency, and the system is very sensitive to the frequency change. In practical application, the mutual inductance change and load change caused by the relative movement of coil may affect the resonance matching of the system, which leads to the drift of resonance frequency, which has a very serious influence on the power transmission level and efficiency of the circuit. How to solve the frequency sensitivity of the system to mutual inductance and load change through control and circuit, and how to improve the stability of working frequency is of great research value. In this paper, a method of using LLC composite resonant circuit in the system is proposed. Based on the research of compensation circuit in WPT system, the main work of this paper is as follows: (1) the function of resonant compensation circuit in WPT system is introduced, the basic resonant topology is introduced, and some characteristics of existing topology are analyzed, and then the composite resonant topology mode that should be adopted is put forward, and the scheme of adopting LLC composite resonant topology is proposed. (2) A WPT system with bilateral LLC composite resonant structure is proposed. The resonance conditions and the corresponding proof process are analyzed in detail. The impedance model is used to analyze the system in detail, the characteristics of the system are obtained, and the corresponding output representation and power representation are derived. (3) in view of the fact that the bilateral LLC structure is too complex, the S-LLC simplified topology is proposed, and the impedance model verifies that the topology still has the frequency characteristics of the bilateral LLC system, and deduces the output expression of the system at this time. A phase shift control method which can be used in the system is proposed. (4) the design and optimization of system parameters after the introduction of LLC composite resonance topology is analyzed, and the influence of parallel inductance Lm and load value on the performance of the system under the condition of non-ideal parameters is explained. A reasonable range of parameters is given. (5) according to the output characteristics and control of the analyzed S-LLC system, simulation and experiments are carried out to verify the theoretical derivation characteristics.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM724

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