本文關(guān)鍵詞： 功率因數(shù)校正 單開關(guān)隔離型 正弦平方補(bǔ)償 諧振 變導(dǎo)通時(shí)間　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著電力電子設(shè)備的廣泛應(yīng)用,AC-DC開關(guān)變換器為公共電網(wǎng)帶來了嚴(yán)重的諧波污染。功率因數(shù)校正(Power Factor Correction,PFC)技術(shù)可以有效地消除電力系統(tǒng)的諧波污染,提高輸入功率因數(shù)。因此,PFC技術(shù)在AD-DC開關(guān)變換器中得到了廣泛的應(yīng)用。單開關(guān)隔離型PFC變換器具有輸入輸出隔離、成本低、結(jié)構(gòu)簡(jiǎn)單等優(yōu)點(diǎn)而被廣泛應(yīng)用于PFC技術(shù)領(lǐng)域,其中反激PFC變換器最受歡迎。一般來說,由于變壓器漏感的能量需要被RCD緩沖電路消耗,才能避免電路中出現(xiàn)較大的電壓、電流尖峰。因此,反激PFC變換器的工作效率將因其緩沖電路而受到限制。本文致力于研究高功率因數(shù)、高效率的隔離型PFC變換器。傳統(tǒng)峰值電流控制(Peak Current Controlled,PCC)臨界連續(xù)模式(Critical Conduction Mode,CRM)反激PFC變換器的開關(guān)管電流峰值包絡(luò)跟隨輸入正弦半波電壓,導(dǎo)致輸入電流不是標(biāo)準(zhǔn)正弦波。本文提出一種正弦平方補(bǔ)償峰值電流控制(Sine Square Compensated Peak Current Controlled,S2C-PCC)方法。在PCC-CRM反激PFC變換器的開關(guān)管峰值電流包絡(luò)中補(bǔ)償一個(gè)正弦平方項(xiàng),該項(xiàng)系數(shù)由輸入電壓幅值、輸出電壓和變壓器原副邊線圈匝比共同決定。以補(bǔ)償后的峰值電流包絡(luò)對(duì)開關(guān)管電流峰值進(jìn)行控制,使變換器在全輸入電壓范圍內(nèi)實(shí)現(xiàn)單位功率因數(shù)。最后,通過仿真和實(shí)驗(yàn)驗(yàn)證了理論分析的正確性。為降低CRM反激PFC變換器中變壓器漏感的能量損耗,提高變換器的工作效率,本文首次在CRM反激PFC變換器的變壓器副邊引入一個(gè)由諧振電容、變壓器漏感以及續(xù)流二極管組成的諧振網(wǎng)絡(luò),將變換器漏感能量傳遞到負(fù)載,提高了變換器的工作效率,降低了開關(guān)管、二極管的電壓應(yīng)力。同時(shí),采用定導(dǎo)通時(shí)間(Constant On Time,COT)控制方法,還使得變換器的輸入電流變得更加正弦。最后,通過仿真和實(shí)驗(yàn)驗(yàn)證了理論分析的正確性。類似地,本文將諧振網(wǎng)絡(luò)引入到斷續(xù)模式(Discontinuous Conduction Mode,DCM)反激PFC變換器中,解決了 DCM反激PFC變換器低工作效率的問題,但也使得原有的標(biāo)準(zhǔn)正弦輸入電流發(fā)生嚴(yán)重的畸變。因此,為了消除諧振網(wǎng)絡(luò)給DCM反激PFC變換器帶來的不利影響,本文將VOT控制方法應(yīng)用到了 DCM單開關(guān)諧振隔離型PFC變換器中。通過引入輸入電壓和輸出電壓來共同調(diào)節(jié)開關(guān)管導(dǎo)通時(shí)間,使得VOT-DCM單開關(guān)諧振隔離型PFC變換器具有高工作效率、低器件應(yīng)力的同時(shí),還能夠保持和COT-DCM反激PFC變換器同樣高的功率因數(shù)。最后,通過仿真和實(shí)驗(yàn)驗(yàn)證了理論分析的正確性。
[Abstract]:With the wide application of power electronic equipment, AC-DC switching converter has brought serious harmonic pollution to public power grid. Power factor correction (PFC) technology can effectively eliminate harmonic pollution in power system. Therefore, PFC technology has been widely used in AD-DC switching converters. Single switch isolated PFC converters are widely used in the field of PFC technology because of their advantages of input and output isolation, low cost, simple structure and so on. The flyback PFC converter is the most popular. Generally speaking, because the leakage inductance of transformer needs to be consumed by the RCD snubber circuit, it can avoid the large voltage and current spike in the circuit. The efficiency of flyback PFC converter will be limited by its snubber circuit. High efficiency isolated PFC converter. The switching current peak envelope of the traditional Peak Current controlled PFC (PFC) flyback PFC converter follows the input sinusoidal half-wave voltage. The input current is not a standard sinusoidal wave. In this paper, a sine squared compensated peak current control Square Compensated Peak Current controlled S2C-PCCCmethod is proposed to compensate a sinusoidal squared term in the switching tube peak current envelope of the PCC-CRM flyback PFC converter. The coefficient is determined by the amplitude of the input voltage, the output voltage and the turn ratio of the primary secondary coil of the transformer. The peak value of the switching current is controlled by the compensated peak current envelope. In order to reduce the energy loss of transformer leakage inductance in CRM flyback PFC converter, the unit power factor is realized in the full input voltage range. Finally, the correctness of theoretical analysis is verified by simulation and experiment. In order to reduce the energy loss of transformer leakage inductance in CRM flyback PFC converter, the efficiency of converter is improved. In this paper, a resonant network composed of resonant capacitor, transformer leakage inductance and diode is introduced into the transformer side of CRM flyback PFC converter for the first time. The leakage inductance energy of the converter is transferred to the load and the efficiency of the converter is improved. The voltage stress of the switch and diode is reduced. At the same time, the constant on time control method is used to make the input current of the converter more sinusoidal. The correctness of the theoretical analysis is verified by simulation and experiment. Similarly, the resonant network is introduced into discontinuous Conduction mode flyback PFC converter, which solves the problem of low efficiency of DCM flyback PFC converter. However, the original standard sinusoidal input current is seriously distorted. Therefore, in order to eliminate the adverse effects of the resonant network on the DCM flyback PFC converter, In this paper, the VOT control method is applied to the DCM single-switch resonant isolation PFC converter. By introducing input voltage and output voltage to adjust the switching on time together, the VOT-DCM single-switch resonant isolation PFC converter has a high working efficiency. At the same time, it can maintain the same high power factor as the COT-DCM flyback PFC converter. Finally, the correctness of the theoretical analysis is verified by simulation and experiment.
【學(xué)位授予單位】：西南交通大學(xué)
【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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本文編號(hào)：1554606