【摘要】：非接觸供電技術是近年來受到廣泛專注的一項電能變換技術，其采用原副邊分離的變壓器，利用磁場耦合原理傳輸電能，其供電靈活、可靠，無火花和觸電危險，因而已在人體植入設備、手機以及電動汽車充電等多種場合得到了應用。 在非接觸供電系統(tǒng)中，負載參數甚至主電路參數都要求變化。對于人體植入設備等應用場合，非接觸變壓器的間距及變換器負載更是實時變化，這就要求非接觸供電系統(tǒng)具有良好的參數變化適應能力。本文以串串補償非接觸諧振變換器作為研究對象，探討其自激控制方法的實現，以提高變換器對系統(tǒng)變參數的適應性并獲得良好的動態(tài)性能。 論文首先根據串串補償非接觸諧振變換器的互感等效模型，在考慮繞組電阻的條件下，分析并推導了變換器的輸出電壓增益、轉移阻抗、輸入阻抗以及效率傳輸特性，揭示了串串補償非接觸變換器的自激控制特性——通過檢測變換器副邊電流過零點控制逆變器開關管的通斷就可以讓變換器自動工作在高頻增益交點、實現自激控制，并給出了相應的自激控制系統(tǒng)框圖。 論文在構建自激控制系統(tǒng)框圖的基礎上，指出變換器副邊電流相位的準確檢測和非接觸反饋是自激控制實現的關鍵，并從相位檢測元件、延時特性分析、延時補償電路多方面進行了深入細致地研究，以確保自激工作點的準確性。論文提出了用于相位檢測的測試繞組短路的非接觸電流互感器，詳細分析了其工作原理，研究了其測試誤差。并從整個控制系統(tǒng)的角度討論了電路各單元對電流相位信號的延時影響，指出需要加入時間延遲補償電路進行修正。根據控制電路延時時間基本固定的特性，提出了RCR時間延遲補償電路，保證在變換器的工作頻段內實現固定時間的超前補償。論文還結合啟動階段上管驅動電源初始建壓困難的問題，，給出了解決方案，保證了啟動的可靠實現。 最后，論文設計并搭建了一臺采用非接觸電流互感器的60W自激控制串串補償非接觸諧振變換器，進行了詳細的實驗研究。變換器的穩(wěn)態(tài)實驗結果證明了所提出的非接觸互感器和時間延遲補償電路的有效性。在自激控制方法下，變換器獲得了近似恒定的輸出，在10mm氣隙滿載條件下變換器效率達89.2%，20mm氣隙下效率達84%。為驗證自激控制的快速響應性，論文還設計了相應的動態(tài)測試電路，相關實驗證明了自激控制方法可在一個開關周期內響應變換器參數變化。論文給出的動、靜態(tài)特性的實驗結果充分表明所提出的自激控制串串補償非接觸諧振變換器可以自動適應變壓器參數和負載參數的變化，具有良好的動態(tài)特性。
[Abstract]:Contactless power supply technology is a widely focused electric energy conversion technology in recent years. It adopts transformer which is separated from the original side and uses magnetic field coupling principle to transmit electric energy. Its power supply is flexible, reliable, non-sparking and electrocution dangerous, and its power supply is flexible, reliable and free of spark and electric shock. As a result, it has been used in many fields such as human implant device, mobile phone and electric vehicle charging and so on. In the contactless power supply system, the load parameters and even the main circuit parameters need to be changed. For applications such as human implanted equipment, the distance between non-contact transformers and the load of the converter are changed in real time, which requires the non-contact power supply system to have a good adaptability to the variation of parameters. In this paper, the serial compensation contactless resonant converter is taken as the research object, and the realization of its self-excitation control method is discussed in order to improve the adaptability of the converter to the variable parameters of the system and obtain good dynamic performance. Firstly, according to the mutual inductance equivalent model of series compensation contactless resonant converter, the output voltage gain, transfer impedance, input impedance and efficiency transmission characteristics of the converter are analyzed and deduced under the condition of considering winding resistance. The self-excited control characteristic of series compensation contactless converter is revealed. The self-excited control can be realized by detecting the switching on and off of the inverter switch controlled by the side current crossing zero, which can make the converter work at the high frequency gain intersection automatically, and realize the self-excited control by detecting the switching on and off of the inverter. The block diagram of self-excited control system is given. Based on the frame diagram of the self-excited control system, it is pointed out that the accurate detection and non-contact feedback of the secondary current phase of the converter is the key to the realization of the self-excited control, and the delay characteristics of the converter are analyzed from the phase detection elements and the delay characteristics. The delay compensation circuit is studied in many aspects in order to ensure the accuracy of the self-excited working point. In this paper, a non-contact current transformer for measuring winding short circuit for phase detection is proposed, its working principle is analyzed in detail, and its testing error is studied. From the point of view of the whole control system, the delay effect of each unit of the circuit on the current phase signal is discussed, and it is pointed out that the time delay compensation circuit should be added to modify the current phase signal. According to the characteristic that the delay time of the control circuit is fixed, the RCR time delay compensation circuit is proposed to ensure that the fixed time advance compensation can be realized in the working frequency band of the converter. Combined with the difficulty of the initial build-up of the tube driving power supply in the start-up phase, the solution is given to ensure the reliable realization of the start-up. Finally, a 60W self-excited control series compensated contactless resonant converter with contactless current transformer is designed and built, and a detailed experimental study is carried out. The steady-state experimental results of the converter demonstrate the effectiveness of the proposed contactless transformer and time delay compensation circuit. Under the self-excited control method, the output of the converter is approximately constant. The efficiency of the converter is up to 89.2% under the full load condition of 10mm air gap and 84% under 20mm air gap. In order to verify the fast response of self-excitation control, the corresponding dynamic test circuit is also designed. The experiments show that the self-excitation control method can respond to the change of converter parameters in a switching period. The experimental results of dynamic and static characteristics show that the proposed series compensation contactless resonant converter with self-excited control can automatically adapt to the change of transformer parameters and load parameters and has good dynamic characteristics.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM452;TM724

【參考文獻】

相關期刊論文 前1條

1 侯佳;陳乾宏;嚴開沁;李明碩;張強;阮新波;;新型S/SP補償的非接觸諧振變換器分析與控制[J];中國電機工程學報;2013年33期

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