【摘要】：電感電流偽連續(xù)導(dǎo)電模式(Pseudo-Continuous Conduction Mode,PCCM)是開(kāi)關(guān)變換器的一種特殊工作模式,它兼顧了電感電流連續(xù)導(dǎo)電模式(Continuous Conduction Mode,CCM)和電感電流斷續(xù)導(dǎo)電模式(Discontinuous Conduction Mode,DCM)開(kāi)關(guān)變換器的優(yōu)點(diǎn),適用于寬負(fù)載或?qū)捁β史秶?且具有解耦控制和抗交叉影響能力強(qiáng)的特點(diǎn)。因此對(duì)PCCM開(kāi)關(guān)變換器進(jìn)行研究具有重要意義。為了提高PCCM開(kāi)關(guān)變換器的輕載效率,本論文提出了一種適用于PCCM開(kāi)關(guān)變換器的定關(guān)斷時(shí)間控制技術(shù)。在詳細(xì)分析定關(guān)斷時(shí)間控制PCCM Buck變換器工作原理的基礎(chǔ)上,通過(guò)仿真對(duì)比分析了傳統(tǒng)恒定參考電流(Constant Reference Current,CRC)控制和定關(guān)斷時(shí)間控制PCCM Buck變換器的穩(wěn)態(tài)性能、瞬態(tài)性能和寬負(fù)載范圍內(nèi)的效率。開(kāi)關(guān)電源的V~2(Voltage-Voltage,V~2)控制技術(shù)具有快速的負(fù)載瞬態(tài)響應(yīng)速度。結(jié)合V~2控制技術(shù),本論文提出一種適用于PCCM開(kāi)關(guān)變換器的V~2定續(xù)流時(shí)間控制技術(shù)。在詳細(xì)分析V~2-CRC控制和V~2定續(xù)流時(shí)間控制PCCM Buck變換器工作原理的基礎(chǔ)上,分別建立了 V~2-CRC控制和V~2定續(xù)流時(shí)間控制PCCM Buck變換器的小信號(hào)模型,得到了兩種控制方式下PCCMBuck變換器的"控制-輸出"、"輸入-輸出"、"輸出阻抗"傳遞函數(shù)。通過(guò)仿真對(duì)比分析了兩種控制下PCCMBuck變換器的頻域性能,并通過(guò)時(shí)域仿真驗(yàn)證了頻域分析的正確性。建立了傳統(tǒng)CRC控制PCCM Buck變換器的離散迭代映射模型,基于離散迭代映射模型,當(dāng)負(fù)載電阻、電感等效串聯(lián)電阻、輸入電壓、續(xù)流參考值、電感和輸出電容等電路參數(shù)發(fā)生變化時(shí),分析了 PCCM Buck變換器的動(dòng)力學(xué)行為。建立相應(yīng)的時(shí)域模型,得到對(duì)應(yīng)參數(shù)下變換器的輸出電壓和電感電流的時(shí)域波形,驗(yàn)證了離散建模的正確性。所得結(jié)論對(duì)于研究和控制PCCM Buck變換器具有重要意義。最后,搭建了不同控制方式下PCCM Buck變換器的實(shí)驗(yàn)平臺(tái),通過(guò)實(shí)驗(yàn)研究驗(yàn)證了理論分析和仿真分析的正確性。
[Abstract]:Inductance current pseudo-continuous conduction mode (Pseudo-Continuous Conduction Mode,PCCM) is a special mode of switching converter. It takes into account the advantages of inductance current continuous conduction mode (Continuous Conduction Mode,CCM) and inductance current intermittent conductive mode (Discontinuous Conduction Mode,DCM) switching converter. It is suitable for wide load or wide power range, and has strong ability of decoupling control and anti-cross effect. Therefore, it is of great significance to study the PCCM switching converter. In order to improve the light-load efficiency of PCCM switching converters, this paper presents a switching time control technique suitable for PCCM switching converters. Based on the detailed analysis of the working principle of the fixed turn-off time control (PCCM Buck) converter, the steady-state performance of the traditional constant reference current (Constant Reference Current,CRC) control and the turn-off time control (PCCM Buck) converter is analyzed by simulation. Transient performance and efficiency over a wide load range. Vt 2 (Voltage-Voltage,V~2) control technology of switching power supply has fast transient response speed of load. Combined with V2 control technology, this paper presents a V2 constant current time control technique for PCCM converter. Based on the detailed analysis of the principle of V~2-CRC control and PCCM Buck converter, the small signal models of PCCM Buck converter controlled by V~2-CRC control and VX 2 control are established, respectively. The "control-output", "input-output" and "output impedance" transfer functions of PCCMBuck converters under two control modes are obtained. The frequency domain performance of PCCMBuck converter under two kinds of control is analyzed by simulation, and the correctness of frequency domain analysis is verified by time domain simulation. The discrete iterative mapping model of traditional CRC controlled PCCM Buck converter is established. Based on the discrete iterative mapping model, when the load resistance, inductance equivalent series resistance, input voltage, continuous current reference value are obtained, The dynamic behavior of PCCM Buck converter is analyzed when the circuit parameters such as inductance and output capacitance change. The corresponding time-domain model is established and the output voltage and inductance current waveforms of the converter are obtained under the corresponding parameters, which verifies the correctness of the discrete modeling. The conclusions are of great significance for the study and control of PCCM Buck converters. Finally, the experimental platform of PCCM Buck converter with different control modes is built, and the correctness of theoretical analysis and simulation analysis is verified by experimental research.
【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(lèi)號(hào)】：TM46

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