本文選題：紋波控制技術　切入點：穩(wěn)定性　出處：《合肥工業(yè)大學》2017年碩士論文

【摘要】：對于電壓調(diào)節(jié)模塊而言,輕載轉(zhuǎn)換效率和負載瞬態(tài)響應速度是其性能的重要衡量指標。在實際中,很多應用場合對這些指標的要求日益苛刻,這也促使基于輸出電壓紋波的控制技術越來越廣泛的被應用于電壓調(diào)節(jié)模塊中。雖然基于輸出電壓紋波的控制技術普遍具有瞬態(tài)響應速度快、輕載效率高的突出優(yōu)點,但是這類控制技術也存在著穩(wěn)定性易受輸出電容等效串聯(lián)電阻(Equivalent Series Resistance,ESR)的影響以及穩(wěn)態(tài)精度較差的問題。目前,針對基于輸出電壓紋波控制技術的穩(wěn)定性易受輸出電容ESR影響這一問題,主要的解決方案有斜坡補償技術、電感電流紋波反饋結構和電容電流反饋技術。斜坡補償技術將采樣電感電流得到的斜坡補償電壓引入至反饋控制回路中,但是這種方案會降低開關變換器的動態(tài)性能,而且會增大輸出電壓的穩(wěn)態(tài)偏差量;電感電流紋波反饋結構將電感電流紋波信息引入至反饋控制回路中,該方案實現(xiàn)簡單,但很難兼顧系統(tǒng)穩(wěn)定性和輸出電壓穩(wěn)態(tài)偏差;電容電流反饋技術將電容電流引入至反饋控制回路中,由于需要檢測電容電流,導致成本相對較高,而且誤差放大器的加入,增加了控制電路的復雜程度和設計難度。針對基于輸出電壓紋波的控制技術存在的穩(wěn)定性問題,以及現(xiàn)有解決方案的不足,本文提出了仿輸出電壓紋波(Simulated Output Voltage Ripple,SOVR)的解決方案,并將其應用于固定導通時間(Constant On-Time,COT)控制和電壓型滯環(huán)控制這兩種典型的基于輸出電壓紋波控制的Buck變換器中。詳細闡述了SOVR結構的工作原理,并分析了其在電感電流連續(xù)導電模式(Continuous Conduction Mode,CCM)以及斷續(xù)導電模式(Discontinuous Conduction Mode,DCM)下的工作特性。通過仿真結果,對比了已有的穩(wěn)定性改善方案和SOVR解決方案在CCM和DCM情形下的穩(wěn)態(tài)性能。仿真結果表明SOVR和電感電流紋波反饋結構都可以較好的解決紋波控制技術存在的穩(wěn)定性問題,但相比之下,SOVR結構具有更好的穩(wěn)態(tài)性能。為驗證理論分析和仿真結果的正確性,在實驗室搭建了相應的實驗樣機。實驗結果表明:SOVR和電感電流紋波反饋結構均可以消除輸出電容ESR對系統(tǒng)穩(wěn)定性的影響,但電感電流紋波反饋結構會對穩(wěn)態(tài)誤差產(chǎn)生影響,SOVR結構具有更好的穩(wěn)態(tài)性能。
[Abstract]:For voltage regulation module, the efficiency of light load conversion and the transient response speed of load are important indicators of its performance.In practice, the requirements of these parameters are increasingly demanding in many applications, which makes the output voltage ripple based control technology more and more widely used in voltage regulation modules.Although the control technology based on output voltage ripple generally has the outstanding advantages of high transient response speed and high light load efficiency,However, the stability of this kind of control technology is easy to be affected by the equivalent series resistance of output capacitance and the problem of poor steady-state accuracy.At present, the stability based on output voltage ripple control technology is easily affected by output capacitance ESR. The main solutions are slope compensation, inductance current ripple feedback structure and capacitive current feedback technology.The slope compensation technique introduces the slope compensation voltage from the sampling inductance current into the feedback control circuit, but this scheme will reduce the dynamic performance of the switching converter and increase the steady-state deviation of the output voltage.The inductance current ripple feedback structure introduces the inductance current ripple information into the feedback control loop. The scheme is simple, but it is difficult to give consideration to the stability of the system and the steady-state deviation of the output voltage.Capacitive current feedback technology introduces capacitor current into feedback control circuit. Because of the need to detect capacitance current, the cost is relatively high, and the addition of error amplifier increases the complexity and design difficulty of the control circuit.In view of the stability problem of output voltage ripple based control technology and the shortcomings of existing solutions, this paper proposes a solution of imitating output voltage ripple Output Voltage ripplette so VRR.It is applied to two typical Buck converters based on output voltage ripple control, which are constant on-time control and voltage hysteresis control.The working principle of SOVR structure is described in detail, and its working characteristics under continuous Conduction mode (CCM) and discontinuous Conduction mode (DCM) are analyzed.Based on the simulation results, the steady-state performance of existing stability improvement schemes and SOVR solutions in CCM and DCM cases are compared.The simulation results show that both SOVR and inductor current ripple feedback structure can solve the stability problem of ripple control technology, but the structure has better steady-state performance.In order to verify the correctness of theoretical analysis and simulation results, a corresponding experimental prototype was built in the laboratory.The experimental results show that both the output capacitance ESR and the inductor current ripple feedback structure can eliminate the influence of the output capacitance ESR on the stability of the system, but the inductance current ripple feedback structure will affect the steady-state error of the system.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN86

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