本文選題：磁耦合諧振式 + 頻率跟蹤　； 參考：《重慶大學(xué)》2016年碩士論文

【摘要】：磁耦合諧振式無線能量傳輸是近十年新興的中等距離電能傳輸技術(shù),利用磁場(chǎng)在電感線圈中的共振耦合,實(shí)現(xiàn)傳輸功率和距離的提高。由于傳輸距離、功率、成本和靈活性的優(yōu)勢(shì),磁耦合諧振技術(shù)已成為無線能量傳輸領(lǐng)域的研究熱點(diǎn)�，F(xiàn)有研究表明,磁耦合諧振系統(tǒng)在耦合系數(shù)較高時(shí)存在嚴(yán)重的頻率分裂現(xiàn)象,激勵(lì)源頻率成為制約功率提高的重要因素。收發(fā)線圈之間的距離具有隨機(jī)性的特點(diǎn),難以保證負(fù)載接收功率和額定功率的吻合。本文將從理論上分析最佳頻率的偏移規(guī)律和功率的衰減特性,提出相應(yīng)的頻率跟蹤和功率控制策略。頻率跟蹤方面,本文利用互感理論對(duì)串聯(lián)型諧振回路進(jìn)行建模,分析最佳頻率點(diǎn)隨耦合系數(shù)的變化規(guī)律。當(dāng)系統(tǒng)處于過耦合狀態(tài)時(shí),由于收發(fā)回路的阻抗特性發(fā)生變化,系統(tǒng)的最大功率傳輸頻率點(diǎn)向固有頻率兩側(cè)偏移,且發(fā)送回路在該頻率點(diǎn)仍將保持諧振狀態(tài)。因此,跟蹤發(fā)送回路諧振頻率的偏移,可以實(shí)現(xiàn)過耦合狀態(tài)下的功率提高。結(jié)合羅耶振蕩器的工作原理,系統(tǒng)采用改進(jìn)的羅耶電路實(shí)現(xiàn)頻率跟蹤、電壓逆變和共振耦合功能。功率控制方面,在線圈的感應(yīng)范圍內(nèi),系統(tǒng)傳輸功率總是隨距離的增加而迅速衰減。為保證負(fù)載接收功率和額定功率的一致性,本文在收發(fā)兩端建立通信鏈路,通過接收狀態(tài)的實(shí)時(shí)監(jiān)控和反饋調(diào)節(jié),保證接收功率的穩(wěn)定和準(zhǔn)確。由于電感線圈的諧振電壓、磁通量的變化率和感應(yīng)電壓存在正比關(guān)系,本文提出利用升壓電路進(jìn)行功率控制的策略。為了適應(yīng)升壓電路的要求,系統(tǒng)采用比例-積分-微分調(diào)節(jié)器來控制羅耶振蕩電路的輸入電壓,從而達(dá)到調(diào)節(jié)傳輸功率的目的。基于電路理論的分析和仿真結(jié)果,本文搭建一套完整的磁耦合諧振式無線能量傳輸裝置并進(jìn)行測(cè)試。結(jié)果表明,該裝置可以在12cm距離內(nèi)實(shí)現(xiàn)5W穩(wěn)定功率的傳輸。
[Abstract]:Magnetic coupling resonant wireless energy transmission is a new medium distance power transmission technology in recent ten years. By using the resonance coupling of magnetic field in inductance coil, the transmission power and distance can be improved. Due to the advantages of transmission distance, power, cost and flexibility, magnetically coupled resonance technology has become a hot topic in the field of wireless energy transmission. The current studies show that the frequency splitting phenomenon of the magnetically coupled resonance system is serious when the coupling coefficient is high and the frequency of the excitation source is an important factor restricting the power increase. The distance between the receiving and transmitting coils is random, so it is difficult to match the load receiving power with the rated power. In this paper, the migration law of optimal frequency and the attenuation characteristics of power are analyzed theoretically, and the corresponding frequency tracking and power control strategies are proposed. In the aspect of frequency tracking, the mutual inductance theory is used to model the series resonant loop, and the variation law of the optimal frequency point with the coupling coefficient is analyzed. When the system is in an over-coupled state, the maximum power transmission frequency of the system deviates to both sides of the natural frequency due to the change of the impedance characteristics of the transceiver loop, and the transmission loop will remain resonant at this frequency point. Therefore, tracking the offset of the resonant frequency of the transmission loop can improve the power in the over-coupling state. Combined with the working principle of Royer oscillator, the system adopts the improved Loyer circuit to realize frequency tracking, voltage inversion and resonance coupling. In power control, in the inductive range of the on-line loop, the transmission power of the system always decreases rapidly with the increase of the distance. In order to ensure the consistency of load receiving power and rated power, this paper establishes a communication link at both ends of the receiving and transmitting stations, and ensures the stability and accuracy of the received power by real-time monitoring and feedback adjusting of the receiving state. Because the resonant voltage of inductance coil and the rate of change of magnetic flux are proportional to the inductive voltage, a power control strategy using boost circuit is proposed in this paper. In order to meet the requirements of the boost circuit, the proportional integral differential regulator is used to control the input voltage of the Loyer oscillating circuit, so as to adjust the transmission power. Based on the analysis of circuit theory and simulation results, a complete set of magnetic coupling resonant wireless energy transmission device is built and tested. The results show that the device can transmit 5 W stable power within 12cm distance.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM724

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