本文選題：開(kāi)關(guān)電容 + AC-AC變換器��； 參考：《中國(guó)計(jì)量學(xué)院》2014年碩士論文

【摘要】：開(kāi)關(guān)電容變換器主要由開(kāi)關(guān)管和電容組成，能夠?qū)崿F(xiàn)電壓變換和能量轉(zhuǎn)換，是一種典型的無(wú)感變換器，具有體積小、重量輕、功率密度大等優(yōu)點(diǎn)，隨著電子設(shè)備的小型化發(fā)展，開(kāi)關(guān)電容AC-AC變換器的應(yīng)用前景將非常廣闊。 本文提出了一種基于開(kāi)關(guān)電容原理的新型AC-AC變換器，能夠?qū)崿F(xiàn)變比為1/4或4的交流電壓變換。設(shè)計(jì)給出了其電路拓?fù)浣Y(jié)構(gòu)，并對(duì)工作原理做了詳細(xì)的分析。為研究變換器的效率問(wèn)題，將電路拓?fù)浜?jiǎn)化成開(kāi)關(guān)電容基本單元，運(yùn)用一階電路全響應(yīng)原理推導(dǎo)出了其等效內(nèi)阻表達(dá)式，并給出了其他主要電路參數(shù)的計(jì)算公式，包括等效電容、功率開(kāi)關(guān)管的損耗、變換器效率等。根據(jù)其效率表達(dá)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(chǔ)上，建立了仿真模型，對(duì)電路拓?fù)浣Y(jié)構(gòu)進(jìn)行仿真驗(yàn)證，分別進(jìn)行了降壓和升壓仿真分析，，其結(jié)果驗(yàn)證了該拓?fù)浣Y(jié)構(gòu)的有效性。 最后，根據(jù)理論分析和仿真驗(yàn)證的結(jié)果，設(shè)計(jì)并研制了一臺(tái)500W220V/55V開(kāi)關(guān)頻率50kHz的原理樣機(jī)，并分別進(jìn)行降壓和升壓實(shí)驗(yàn)。在降壓實(shí)驗(yàn)時(shí)，輸入電壓設(shè)為220V，變換器的空載輸出電壓為55.5V，在阻性、容性負(fù)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(shí)驗(yàn)時(shí)，輸入電壓設(shè)為55V，變換器的空載輸出電壓為219.3V，效率最大為90.69%，實(shí)驗(yàn)結(jié)果驗(yàn)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(xué)位授予單位】：中國(guó)計(jì)量學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM46

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本文編號(hào)：2007968