本文選題：開關電容 + AC-AC變換器　； 參考：《中國計量學院》2014年碩士論文

【摘要】：開關電容變換器主要由開關管和電容組成，能夠實現(xiàn)電壓變換和能量轉換，是一種典型的無感變換器，具有體積小、重量輕、功率密度大等優(yōu)點，隨著電子設備的小型化發(fā)展，開關電容AC-AC變換器的應用前景將非常廣闊。 本文提出了一種基于開關電容原理的新型AC-AC變換器，能夠實現(xiàn)變比為1/4或4的交流電壓變換。設計給出了其電路拓撲結構，并對工作原理做了詳細的分析。為研究變換器的效率問題，將電路拓撲簡化成開關電容基本單元，運用一階電路全響應原理推導出了其等效內阻表達式，并給出了其他主要電路參數(shù)的計算公式，包括等效電容、功率開關管的損耗、變換器效率等。根據(jù)其效率表達式，討論了提高效率的幾種方法，為變換器主要電路參數(shù)的選擇提供了理論依據(jù)。在理論分析的基礎上，建立了仿真模型，對電路拓撲結構進行仿真驗證，分別進行了降壓和升壓仿真分析，，其結果驗證了該拓撲結構的有效性。 最后，根據(jù)理論分析和仿真驗證的結果，設計并研制了一臺500W220V/55V開關頻率50kHz的原理樣機，并分別進行降壓和升壓實驗。在降壓實驗時，輸入電壓設為220V，變換器的空載輸出電壓為55.5V，在阻性、容性負載下，輸出電壓均可保持穩(wěn)定，其效率最大為88.63%；在升壓實驗時，輸入電壓設為55V，變換器的空載輸出電壓為219.3V，效率最大為90.69%，實驗結果驗證了該變換器具有良好的性能。
[Abstract]:Switched capacitor converter is mainly composed of switch tube and capacitor. It can realize voltage conversion and energy conversion. It is a typical sensorless converter. It has the advantages of small size, light weight and high power density. With the development of electronic equipment, the application prospect of switched capacitor AC-AC converter will be very broad.
In this paper, a new type of AC-AC converter based on the principle of switched capacitor is proposed, which can transform the AC voltage to 1/4 or 4. The topology of the circuit is given and the working principle is analyzed in detail. The equivalent internal resistance expression is derived by the full response principle, and the calculation formulas for other main circuit parameters are given, including the equivalent capacitance, the loss of the power switch tube, the efficiency of the converter and so on. According to the efficiency expression, several methods to improve the efficiency are discussed, which provide the theoretical basis for the selection of the main circuit parameters of the converter. On the basis of the analysis, the simulation model is established, and the circuit topology is simulated and verified. The simulation analysis of the buck and boost is carried out respectively. The results verify the validity of the topology.
Finally, according to the results of theoretical analysis and simulation verification, a prototype of 500W220V/55V switching frequency 50kHz is designed and developed, and the pressure lowering and boosting experiments are carried out respectively. In the depressurization experiment, the input voltage is set to 220V, the output voltage of the converter is 55.5V, and the output voltage can be kept stable under resistance and capacitive load. The maximum efficiency is 88.63%. In the boost experiment, the input voltage is set to 55V, the no-load output voltage of the converter is 219.3V and the maximum efficiency is 90.69%. The experimental results verify the good performance of the converter.
【學位授予單位】：中國計量學院
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46

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本文編號：2007968