【摘要】：隨著科學(xué)技術(shù)的快速進(jìn)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(yīng)用。但是,大量電力電子裝置廣泛的接入電網(wǎng),會(huì)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(huì)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(duì)象,提出了一種兩級(jí)電路結(jié)構(gòu)的高功率因數(shù)LLC諧振變換器裝置。前級(jí)電路結(jié)構(gòu)為無(wú)橋Boost功率因數(shù)校正器,后級(jí)電路結(jié)構(gòu)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(guān)注。 本文首先介紹了無(wú)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(wú)橋Boost功率因數(shù)校正器的控制方案,實(shí)現(xiàn)電壓與電流的雙閉環(huán)控制。本文通過(guò)小信號(hào)分析法建立了無(wú)橋Boost功率因數(shù)校正器的小信號(hào)模型,推導(dǎo)出系統(tǒng)總的開(kāi)環(huán)傳遞函數(shù),并利用無(wú)損吸收技術(shù)改善開(kāi)關(guān)管的開(kāi)關(guān)軌跡,降低開(kāi)關(guān)管兩端電壓的變化速率。 其次,本文對(duì)半橋LLC諧振變換器的拓?fù)浣Y(jié)構(gòu)進(jìn)行了分析,并通過(guò)基波分析法建立了LLC諧振變換器的等效電路模型。在一個(gè)諧振周期內(nèi),將半橋LLC諧振變換器劃分為六個(gè)不同的工作模態(tài),詳細(xì)的闡述了每個(gè)模態(tài)的工作過(guò)程,并從實(shí)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(jié)構(gòu),減小變換器體積,文章討論了LLC諧振變換器的磁集成技術(shù),將諧振電感與勵(lì)磁電感集成到同一磁性元件中。 最終,設(shè)計(jì)并制作了一臺(tái)輸出功率為480W的試驗(yàn)裝置,并對(duì)試驗(yàn)裝置進(jìn)行了系統(tǒng)的調(diào)試,測(cè)量了裝置關(guān)鍵點(diǎn)的實(shí)驗(yàn)波形。對(duì)測(cè)量得到的實(shí)驗(yàn)波形進(jìn)行分析表明：實(shí)驗(yàn)樣機(jī)具有高功率因數(shù)、高電路效率等特點(diǎn)。
[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(xué)位授予單位】：廣西大學(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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本文編號(hào)：2239070