發(fā)布時(shí)間：2018-06-14 06:24

  本文選題：移相全橋 + 高升壓比　； 參考：《浙江大學(xué)》2014年碩士論文

【摘要】：移相全橋直流變換器作為最為經(jīng)典的拓?fù)渲?在中大功率應(yīng)用方面一直廣受歡迎。主要是由于拓?fù)浔旧泶嬖谲涢_(kāi)關(guān)易實(shí)現(xiàn),結(jié)構(gòu)簡(jiǎn)單等優(yōu)點(diǎn),同時(shí)由其演變而得到了很多零電壓、零電流拓?fù)浣Y(jié)構(gòu),但是該拓?fù)涫怯葿uck變換器演變而來(lái),所以其主要使用于降壓型應(yīng)用場(chǎng)合,對(duì)于升壓型場(chǎng)合,則要依靠變壓器來(lái)實(shí)現(xiàn)升壓作用。移相全橋變換器自身具有的軟開(kāi)關(guān)特性還是吸引了廣大的工程師將其應(yīng)用于升壓場(chǎng)合,而應(yīng)用于升壓場(chǎng)合必然會(huì)暴露諸多缺陷和問(wèn)題。本文主要設(shè)計(jì)了雙變壓器原邊繞組并聯(lián)副邊整流串聯(lián)結(jié)構(gòu)將移相全橋推廣至高升壓應(yīng)用場(chǎng)合,并對(duì)使用中的關(guān)鍵問(wèn)題進(jìn)行分析,同時(shí)給出相應(yīng)的解決方案。首先,本文針對(duì)高升壓應(yīng)用場(chǎng)合,專門(mén)設(shè)計(jì)了雙變壓器原邊繞組并聯(lián),副邊整流串聯(lián)的結(jié)構(gòu),有效減小了變壓器的匝比,降低二極管電壓應(yīng)力,分析了應(yīng)用移相全橋變換器諧振電感帶箝位二極管的拓?fù)浣Y(jié)構(gòu)的工作原理,詳盡介紹了加入箝位二極管后變換器工作的各個(gè)模態(tài),為二極管的箝位機(jī)制提供了理論分析,同時(shí)給出了仿真研究結(jié)果。其次,本文重點(diǎn)對(duì)于移相全橋應(yīng)用于高升壓比場(chǎng)合中的諸多難點(diǎn)問(wèn)題進(jìn)行了分析研究,主要包括針對(duì)高升壓場(chǎng)合專門(mén)設(shè)計(jì)的雙變壓器原邊繞組并聯(lián),副邊整流串聯(lián)結(jié)構(gòu)相對(duì)于傳統(tǒng)電路結(jié)構(gòu)優(yōu)勢(shì),如在變壓器設(shè)計(jì)、溫升,二極管電壓應(yīng)力,占空比丟失等方面的突出貢獻(xiàn)；滯后臂的軟開(kāi)關(guān)如何實(shí)現(xiàn)、隔直電容的大小對(duì)于變換器工作狀態(tài)的影響、箝位二極管不同的箝位位置對(duì)于變換器工作狀態(tài)的影響以及整流二極管的吸收電路分析設(shè)計(jì)等等問(wèn)題,驗(yàn)證了雙變壓器結(jié)構(gòu)在高升壓場(chǎng)合應(yīng)用中的優(yōu)勢(shì),同時(shí)對(duì)難點(diǎn)問(wèn)題提出了相對(duì)應(yīng)的解決方案。最后,為了驗(yàn)證分析及設(shè)計(jì)的合理性,制作了1.5kW的移相全橋直流升壓變換器的樣機(jī)。通過(guò)實(shí)驗(yàn)驗(yàn)證了雙變壓器原邊繞組并聯(lián)副邊串聯(lián)結(jié)構(gòu)能夠有效降低功率變壓器溫升,提升變換器效率,方便整流二極管選型,實(shí)現(xiàn)移相全橋高升壓場(chǎng)合應(yīng)用。移相全橋變換器作為DC/DC變換器領(lǐng)域里廣受推崇的拓?fù)浣Y(jié)構(gòu)之一,是中大功率場(chǎng)合最常用的拓?fù)浣Y(jié)構(gòu),本文設(shè)計(jì)的雙變壓器原邊繞組并聯(lián),副邊串聯(lián)結(jié)構(gòu)能夠?qū)⑵渫茝V至高升壓比的場(chǎng)合,因而具有相當(dāng)重要的意義。對(duì)其應(yīng)用中的各個(gè)難點(diǎn)問(wèn)題均給出了詳盡的分析與解決方案,具有重要的工程實(shí)踐意義,希望對(duì)于各位工程師能有參考價(jià)值。
[Abstract]:Phase-shifted full-bridge DC / DC converter, as one of the most classical topologies, has been widely used in medium and large power applications. The main reason is that the topology itself is easy to realize and the structure is simple. At the same time, a lot of zero-voltage and zero-current topologies are obtained by its evolution, but the topology is evolved from the Buck converter. Therefore, it is mainly used in the application of voltage-down, for the boost-up, it depends on the transformer to achieve the boost-up effect. The soft-switching characteristic of phase-shifted full-bridge converter has attracted many engineers to apply it to booster field, but it will inevitably expose many defects and problems. In this paper, a series structure of parallel auxiliary side rectifier with primary winding of double transformer is designed to extend the phase shift full bridge to the application of high boost voltage. The key problems in use are analyzed, and the corresponding solutions are given. First of all, for the application of high boost voltage, this paper specially designed the structure of double transformer's primary side winding in parallel and secondary side rectifier in series, which can effectively reduce the turn ratio of transformer and the voltage stress of diode. The working principle of the resonant inductance band clamped diode using phase-shifted full-bridge converter is analyzed. The modes of the converter with clamping diode are introduced in detail, which provides a theoretical analysis for the clamping mechanism of the diode. At the same time, the simulation results are given. Secondly, this paper focuses on the analysis and study of many difficult problems in the application of phase-shifted full-bridge in high booster ratio, mainly including the parallel connection of dual transformer primary side windings specially designed for high boost occasions. The secondary side rectifier series structure is superior to the traditional circuit structure, such as the outstanding contribution in transformer design, temperature rise, diode voltage stress, duty cycle loss, and how to realize the soft switch of the lagging arm. The influence of the capacitance on the working state of the converter, the influence of different clamping position of clamping diode on the working state of the converter, and the analysis and design of the absorption circuit of rectifier diode, etc. The advantages of the dual transformer structure in high voltage booster applications are verified, and the corresponding solutions to the difficult problems are put forward. Finally, in order to verify the rationality of the analysis and design, a 1.5 kW phase-shifted full-bridge DC boost converter prototype is made. It is proved by experiments that the series structure of parallel auxiliary edges of the primary side windings of double transformers can effectively reduce the temperature rise of power transformers, improve the efficiency of the converter, facilitate the selection of rectifier diodes, and realize the application of the phase-shifting full-bridge high boost voltage situation. As one of the most popular topologies in DC / DC converters, phase-shifted full-bridge converters are the most commonly used topologies in medium and high power situations. The secondary side series structure can be extended to high boost voltage ratio, so it is of great significance. The detailed analysis and solution of each difficult problem in its application are given, which have important engineering practical significance, and hope to be of reference value to the engineers.
【學(xué)位授予單位】：浙江大學(xué)
【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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