【摘要】：隨著科學技術的快速進步,模塊化、高頻化以及高可靠性的電力電子裝置在工業(yè)及日常生活中得到廣泛的應用。但是,大量電力電子裝置廣泛的接入電網(wǎng),會引起電網(wǎng)諧波污染,影響電網(wǎng)的正常工作。因此,發(fā)展綠色的、高效的電力電子裝置是社會發(fā)展的要求。本文以分布式電源系統(tǒng)的前端AC/DC變換器為研究對象,提出了一種兩級電路結構的高功率因數(shù)LLC諧振變換器裝置。前級電路結構為無橋Boost功率因數(shù)校正器,后級電路結構為半橋LLC諧振變換器,裝置在提高功率因數(shù)與電路效率方面效果顯著,因此備受關注。 本文首先介紹了無橋Boost功率因數(shù)校正器的工作原理,并采用平均電流模式作為無橋Boost功率因數(shù)校正器的控制方案,實現(xiàn)電壓與電流的雙閉環(huán)控制。本文通過小信號分析法建立了無橋Boost功率因數(shù)校正器的小信號模型,推導出系統(tǒng)總的開環(huán)傳遞函數(shù),并利用無損吸收技術改善開關管的開關軌跡,降低開關管兩端電壓的變化速率。 其次,本文對半橋LLC諧振變換器的拓撲結構進行了分析,并通過基波分析法建立了LLC諧振變換器的等效電路模型。在一個諧振周期內(nèi),將半橋LLC諧振變換器劃分為六個不同的工作模態(tài),詳細的闡述了每個模態(tài)的工作過程,并從實現(xiàn)寬范圍電壓增益與高效率的角度出發(fā),優(yōu)化了諧振槽的電路參數(shù)。然后,為了優(yōu)化電路結構,減小變換器體積,文章討論了LLC諧振變換器的磁集成技術,將諧振電感與勵磁電感集成到同一磁性元件中。 最終,設計并制作了一臺輸出功率為480W的試驗裝置,并對試驗裝置進行了系統(tǒng)的調(diào)試,測量了裝置關鍵點的實驗波形。對測量得到的實驗波形進行分析表明：實驗樣機具有高功率因數(shù)、高電路效率等特點。
[Abstract]:With the rapid development of science and technology, modular, high-frequency and high-reliability power electronic devices have been widely used in industry and daily life. However, a large number of power electronic devices are widely connected to the power grid, which will cause harmonic pollution and affect the normal operation of the power grid. Therefore, the development of green, efficient power electronic devices is the requirement of social development. Taking the front-end AC/DC converter of the distributed power system as the research object, a two-stage circuit structure with high power factor LLC resonant converter is proposed in this paper. The former circuit structure is a bridge free Boost power factor corrector, while the latter one is a half-bridge LLC resonant converter. The device has a remarkable effect in improving power factor and circuit efficiency, so it has attracted much attention. In this paper, the working principle of the bridge free Boost power factor corrector is introduced, and the average current mode is used as the control scheme of the bridge free Boost power factor corrector to realize the double closed loop control of voltage and current. In this paper, the small signal model of the bridge free Boost power factor corrector is established by the small signal analysis method, the total open loop transfer function of the system is derived, and the switch path of the switch tube is improved by using the lossless absorption technique. Reduce the rate of voltage change at both ends of the switch tube. Secondly, the topology of half-bridge LLC resonant converter is analyzed, and the equivalent circuit model of LLC resonant converter is established by fundamental analysis. In a resonant period, the half-bridge LLC resonant converter is divided into six different working modes, and the working process of each mode is described in detail, and from the point of view of realizing wide range voltage gain and high efficiency, The circuit parameters of the resonant slot are optimized. Then, in order to optimize the circuit structure and reduce the volume of the converter, the magnetic integration technology of the LLC resonant converter is discussed. The resonant inductance and the excitation inductor are integrated into the same magnetic element. Finally, a 480W test device with output power is designed and manufactured, and the test device is debugged systematically, and the experimental waveform of the key points of the device is measured. The analysis of the experimental waveform shows that the experimental prototype has the characteristics of high power factor and high circuit efficiency.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46

【參考文獻】

相關期刊論文 前10條

1 趙晨;石洋;吳新科;謝小高;錢照明;;三元件串聯(lián)LLC諧振變流器的優(yōu)化設計策略[J];電工技術學報;2008年01期

2 王慧貞;張軍達;;一種新型無橋Boost PFC電路[J];電工技術學報;2010年05期

3 毛鴻,吳兆麟;有源功率因數(shù)校正器的控制策略綜述[J];電力電子技術;2000年01期

4 杜忠,陳治明;一種新穎的PFC無損吸收方法[J];電力電子技術;2003年05期

5 劉慶豐,王華民,孫立萌,冷朝霞;基于IGBT并聯(lián)諧振逆變器工作方式的分析研究[J];電力電子技術;2004年04期

6 歐陽茜;吳國良;錢照明;;LLC諧振全橋DC/DC變流器的優(yōu)化設計[J];電力電子技術;2007年01期

7 周小義;張興;伍瑤;;基于單周期控制的有源功率因數(shù)校正器的研制[J];電力電子技術;2007年01期

8 賁洪奇;金祖敏;劉宇;;單級橋式有源功率因數(shù)校正變換器拓撲研究[J];電力電子技術;2007年08期

9 李志忠;虞龍;王志強;;新型半橋串并聯(lián)諧振高頻感應加熱封口機電源[J];電力電子技術;2008年05期

10 梁昊;張軍明;;一種簡化的LLC諧振變換器小信號分析方法[J];電力電子技術;2011年10期

，

本文編號：2239070