【摘要】：隨著消費類電子和信息技術(shù)(IT)產(chǎn)品的快速更新?lián)Q代,開關(guān)電源的小型化高效化成為了必然的發(fā)展趨勢。為了降低電流諧波對電網(wǎng)的污染,提高電網(wǎng)供電的質(zhì)量,開關(guān)電源通常采用前級為功率因數(shù)校正(PFC)器、后級為DC-DC變換器的兩級電路拓?fù)浣Y(jié)構(gòu)。 采用交錯并聯(lián)Boost變換器構(gòu)建前級PFC電路,可以降低輸入、輸出電流紋波和開關(guān)管的電流應(yīng)力,提高電路的功率密度,控制方案采用基于電感電流臨界導(dǎo)通(CRM)模式的恒定導(dǎo)通時間控制,可以簡化電路結(jié)構(gòu),降低開關(guān)損耗和電磁干擾(EMI)；LLC諧振變換器因其軟開關(guān)特性,適合工作在高開關(guān)頻率場合,且輸入電壓范圍寬,動態(tài)響應(yīng)能力強,成為了后級DC-DC變換器的首選電路拓?fù)?為進一步提高低壓輸出場合的效率,將同步整流技術(shù)引入LLC諧振變換器,采用檢測漏源極電壓的方法來實現(xiàn)對同步整流管的控制。 在上述基礎(chǔ)上,詳細(xì)地分析了高功率因數(shù)的帶同步整流半橋LLC諧振電路的工作原理,介紹了電路的具體設(shè)計過程和參數(shù)選擇依據(jù),最后,分別研制了兩臺實驗樣機,一臺為300W的交錯并聯(lián)Boost型PFC樣機,另一臺為240W的帶同步整流半橋LLC諧振電路樣機,并將兩者進行級聯(lián)調(diào)試,給出相應(yīng)的實驗波形。實驗結(jié)果表明：系統(tǒng)變換電路獲得了高功率因數(shù)和高效率。
[Abstract]:With the rapid upgrading of consumer electronics and information technology (IT) products, the miniaturization and efficiency of switching power supply has become an inevitable trend of development. In order to reduce the pollution of current harmonic to the power grid and improve the quality of power supply, the switching power supply usually adopts the two-stage circuit topology of the first stage as power factor correction (PFC) and the second stage as DC-DC converter. An interleaved Boost converter is used to construct the front-stage PFC circuit, which can reduce the input and output current ripple and the current stress of the switch transistor, and improve the power density of the circuit. The control scheme adopts constant on time control based on the inductor current critical conduction (CRM) mode, which can simplify the circuit structure and reduce the switching loss and electromagnetic interference (EMI);). Due to its soft-switching characteristics, LLC resonant converter is suitable for high switching frequency, and has a wide input voltage range and strong dynamic response. It has become the first choice of circuit topology for later-stage DC-DC converter. In order to improve the efficiency of low voltage output, the synchronous rectifier technology is introduced into the LLC resonant converter, and the control of the synchronous rectifier is realized by detecting the drain source voltage. On the basis of the above, the working principle of the high power factor half bridge LLC resonant circuit with synchronous rectifier is analyzed in detail. The specific design process and parameter selection basis of the circuit are introduced. Finally, two experimental prototypes are developed respectively. One 300W interleaved boost PFC prototype and the other 240W LLC resonant circuit prototype with synchronous rectifying half-bridge were debugged and the corresponding experimental waveforms were given. The experimental results show that the system achieves high power factor and high efficiency.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM461

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