本文選題：DC-DC變換器 + 環(huán)路增益��； 參考：《華中科技大學(xué)》2015年碩士論文

【摘要】：DC-DC變換器的環(huán)路增益可以用來優(yōu)化控制參數(shù),使DC-DC變換器具有良好的穩(wěn)定性和動態(tài)性能。利用網(wǎng)絡(luò)分析儀可以對DC-DC變換器的環(huán)路增益進行測試,測試方法主要有調(diào)制波擾動測試法和脈寬擾動測試法,它們的測試結(jié)果存在差異。本文研究這兩種測試方法測得的環(huán)路增益不同的原因,并分析哪種測試方法是準(zhǔn)確的,進而利用環(huán)路增益的理論測試結(jié)果,提出補償器的設(shè)計思路。第二章介紹調(diào)制波擾動測試法和脈寬擾動測試法的基本原理,然后分析PWM調(diào)制器的混疊效應(yīng)及其產(chǎn)生的邊帶頻率分量,在此基礎(chǔ)上推導(dǎo)調(diào)制波擾動測試法和脈寬擾動測試法的理論環(huán)路增益,并揭示這兩種環(huán)路增益存在差異的原因。提出兩種與脈寬擾動測試法等效的測試方法,即PWM調(diào)制測試法和采樣保持測試法,它們的電路實現(xiàn)更為簡潔。最后對三類基本的DC-DC變換進行實驗測試,測試結(jié)果驗證了以上分析及所提出的測試方法的正確性。第三章利用兩種測試方法所測得的環(huán)路增益對DC-DC變換器的穩(wěn)定性和跟隨性能、抗擾性能進行分析。分析表明,這兩種環(huán)路增益都是有效的,其中,脈寬擾動測試法測得的環(huán)路增益分析穩(wěn)定性時更方便,而調(diào)制波擾動測試法分析跟隨性能和抗擾性能時更加直觀。然后給出環(huán)路增益的計算方法,并對DC-DC變換器的穩(wěn)定性和跟隨性能進行實驗驗證,實驗結(jié)果驗證了本文分析的正確性。第四章針對采用后沿調(diào)制和前沿調(diào)制的三類基本DC-DC變換器,分析邊帶頻率分量對兩種環(huán)路增益的影響,指出它們均受到了邊帶頻率分量的影響,且使用脈寬擾動測試法測得的環(huán)路增益設(shè)計補償器更加方便。利用脈寬擾動測試法測得的環(huán)路增益,提出了考慮邊帶頻率分量影響的補償器設(shè)計思路,并進行了實例設(shè)計及實驗驗證,實驗結(jié)果驗證了提出的設(shè)計方法的有效性。
[Abstract]:The loop gain of DC-DC converter can be used to optimize the control parameters and make the DC-DC converter have good stability and dynamic performance. The loop gain of DC-DC converter can be tested by network analyzer. The main methods are modulation wave disturbance test method and pulse width perturbation test method. This paper studies the reasons why the loop gain measured by the two methods is different, and analyzes which test method is accurate, and then puts forward the design idea of the compensator based on the theoretical test results of the loop gain. In chapter 2, the basic principles of modulation wave perturbation test and pulse width perturbation measurement are introduced, and then the aliasing effect of PWM modulator and its sideband frequency component are analyzed. On this basis, the theoretical loop gain of the modulation wave perturbation testing method and the pulse width perturbation testing method are deduced, and the reasons for the differences between the two kinds of loop gains are revealed. Two kinds of test methods are presented, which are equivalent to the pulse width perturbation method, that is, the PWM modulation test method and the sample-and-hold test method. Their circuit implementation is more concise. Finally, three kinds of basic DC-DC transform are tested, and the test results verify the correctness of the above analysis and the proposed test methods. In chapter 3, the stability, following performance and immunity performance of DC-DC converter are analyzed by using the loop gain measured by two kinds of test methods. The analysis shows that the two kinds of loop gain are effective, in which the loop gain measured by the pulse width perturbation method is more convenient to analyze the stability, while the modulation wave disturbance test method is more intuitive in analyzing the following performance and the disturbance rejection performance. Then the calculation method of loop gain is given, and the stability and follow performance of DC-DC converter are verified by experiments. The experimental results verify the correctness of the analysis in this paper. In chapter 4, the influence of sideband frequency component on the gain of the two loops is analyzed for the three basic DC-DC converters using back-edge modulation and forward modulation, and it is pointed out that they are all affected by the sideband frequency component. And the loop gain design compensator obtained by pulse width disturbance test is more convenient. Based on the loop gain measured by the pulse width perturbation method, the design idea of the compensator considering the influence of sideband frequency component is proposed. An example is designed and the experimental results show that the proposed design method is effective.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM46

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本文編號：1954756