本文選題：直流變換器 + 高增益�。� 參考：《上海電力學(xué)院》2017年碩士論文

【摘要】：傳統(tǒng)能源的匱乏、環(huán)境污染的加劇、電力需求的增長,使得大力發(fā)展清潔能源成為可持續(xù)發(fā)展戰(zhàn)略的重要選擇。升壓直流變換器在以綠色能源為一次能源的應(yīng)用場合中具有極其重要的作用,比如在分布式發(fā)電系統(tǒng)、新能源汽車、LED燈驅(qū)動(dòng)和有源功率因數(shù)校正等領(lǐng)域。傳統(tǒng)Boost變換器因結(jié)構(gòu)簡單被廣泛使用,然而其電壓增益有限。提高電壓增益的方法有很多,而拓?fù)涞膭?chuàng)新對(duì)于在低成本的條件下提高升壓直流變換器的電壓增益更具有一定的優(yōu)勢(shì)。本文在當(dāng)前發(fā)展的直流變換器升壓技術(shù)的基礎(chǔ)上,從拓?fù)鋭?chuàng)新的角度提出了幾種新型的高增益直流變換器。首先,論文利用耦合電感技術(shù),提出了基于耦合電感的新型高增益軟開關(guān)直流變換器,詳細(xì)分析了該變換器的拓?fù)浣Y(jié)構(gòu)、不同的工作模態(tài)及電路中參數(shù)的選擇依據(jù),并與其它變換器進(jìn)行了性能對(duì)比。研究結(jié)果證明該變換器具有幾個(gè)優(yōu)勢(shì):(1)該變換器實(shí)現(xiàn)了從耦合電感匝比和占空比多自由度來調(diào)控電壓增益,突破了傳統(tǒng)升壓變換器中僅由占空比來調(diào)整電壓比的局限;(2)全部開關(guān)器件上的電壓應(yīng)力都比輸出電壓低;(3)該變換器的功率開關(guān)管能軟開通,二極管能在零電流狀態(tài)下自然關(guān)斷,大大緩解了反向恢復(fù)問題,電路損耗降低。其次,論文利用Z源網(wǎng)絡(luò)技術(shù),提出了基于Z源網(wǎng)絡(luò)的高增益低應(yīng)力的直流變換器,文中對(duì)該變換器的拓?fù)浣Y(jié)構(gòu)、工作原理和穩(wěn)態(tài)性能進(jìn)行了討論,并與其它變換器進(jìn)行了性能對(duì)比分析。研究結(jié)果證明本變換器具有的幾個(gè)優(yōu)勢(shì):(1)該變換器利用Z源網(wǎng)絡(luò)進(jìn)一步提升了電壓增益,避免占空比工作在接近1的情況;(2)該變換器的結(jié)構(gòu)使得功率開關(guān)管兩端的電壓應(yīng)力明顯降低;(3)Z源網(wǎng)絡(luò)中的電容紋波可以相互抵消,有助于降低電路中的紋波。最后,論文結(jié)合開關(guān)電容技術(shù),提出了帶有電感-電容結(jié)構(gòu)的高增益Boost變換器,文中介紹了該變換器的拓?fù)浣Y(jié)構(gòu)和其在連續(xù)導(dǎo)通模式和斷續(xù)導(dǎo)通模式下的工作原理,給出了不同變換器間性能對(duì)比分析及該變換器所涉及的參數(shù)設(shè)計(jì)。研究結(jié)果證明本變換器具有的幾個(gè)優(yōu)勢(shì):(1)該變換器在開關(guān)管導(dǎo)通時(shí)利用開關(guān)電容增加了電感-電容結(jié)構(gòu)兩端的充電電壓,在開關(guān)管關(guān)斷時(shí)電感和電容的串聯(lián)放電,從而變換器的電壓增益大大提升,這種方式能降低開關(guān)管的占空比;(2)該變換器占空比的減小能有效降低開關(guān)管上的電流紋波,電路損耗得以降低。論文中提出的新型升壓直流變換器,具有高增益、低應(yīng)力的優(yōu)勢(shì),使其適用于低壓新能源發(fā)電系統(tǒng)等場合。
[Abstract]:Due to the shortage of traditional energy, the aggravation of environmental pollution and the increase of electricity demand, the development of clean energy has become an important choice of sustainable development strategy. Booster DC / DC converters play an important role in applications where green energy is used as primary energy, such as distributed generation systems, new energy vehicles driving LED lights and active power factor correction (APFC). Traditional Boost converter is widely used because of its simple structure, but its voltage gain is limited. There are many ways to improve the voltage gain, and the topology innovation has a certain advantage to improve the voltage gain of the boost DC converter under the condition of low cost. In this paper, based on the current development of DC converter boost technology, several new high gain DC / DC converters are proposed from the viewpoint of topology innovation. Firstly, a novel high gain soft-switching DC / DC converter based on coupling inductance is proposed, and its topology, different working modes and the selection of parameters in the circuit are analyzed in detail. The performance of the converter is compared with that of other converters. The results show that the converter has several advantages: (1) the converter can control the voltage gain from the coupling inductor turn ratio and duty cycle multiple degrees of freedom. It breaks through the limitation that only duty cycle is used to adjust the voltage ratio in the traditional boost converter. (2) the voltage stress on all switching devices is lower than the output voltage. 3) the power switch of the converter can be turned on soft, and the diode can be turned off naturally at zero current state. The reverse recovery problem is greatly alleviated and the circuit loss is reduced. Secondly, a high gain and low stress DC / DC converter based on Z source network is proposed in this paper. The topology, working principle and steady state performance of the converter are discussed. The performance of the converter is compared with that of other converters. The results show that the converter has several advantages: 1) the converter uses the Z-source network to further enhance the voltage gain. The structure of the converter makes the voltage stress at the two ends of the power switch obviously reduce the capacitance ripple in the power switch network, which is helpful to reduce the ripple in the circuit. Finally, a high gain Boost converter with inductance and capacitor structure is proposed, and its topology and its working principle in continuous and intermittent on-mode are introduced. The performance comparison and analysis among different converters and the design of parameters involved in the converter are given. The results show that the converter has several advantages: (1) the switching capacitor is used to increase the charging voltage at both ends of the inductor-capacitor structure, and the series discharge between the inductor and the capacitor is achieved when the switch is off. Thus, the voltage gain of the converter is greatly increased, and the duty cycle of the switch can be reduced by this way. The decrease of the duty cycle can effectively reduce the current ripple on the switch and reduce the circuit loss. The new boost DC / DC converter proposed in this paper has the advantages of high gain and low stress, which makes it suitable for low voltage new energy generation system.
【學(xué)位授予單位】：上海電力學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM46

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