本文選題：諧振變換器 + 斷續(xù)電流模式�。� 參考：《華中科技大學(xué)》2014年博士論文

【摘要】：高頻化運(yùn)行是電力電子變換器實(shí)現(xiàn)高功率密度和高集成度的重要途徑。諧振變換器具有良好的軟開(kāi)關(guān)優(yōu)勢(shì),可以借助自身電路環(huán)境實(shí)現(xiàn)器件的零電壓開(kāi)關(guān)或零電流開(kāi)關(guān),有利于降低變換器的損耗。而LCC諧振變換器兼顧了二元件諧振變換器各自的優(yōu)點(diǎn),具有抵抗負(fù)載開(kāi)路和短路、兼容變壓器寄生參數(shù)的能力,是一種常見(jiàn)的用來(lái)實(shí)現(xiàn)高壓直流電源的電路結(jié)構(gòu)。本文分析比較了當(dāng)前建模方法應(yīng)對(duì)變換器非線性特性的不足和精確建模所需要解決的關(guān)鍵性問(wèn)題,提出了利用狀態(tài)空間法迭代求解實(shí)現(xiàn)變換器不同電流模式下精確建模及開(kāi)關(guān)特性分析的思路,為變換器的設(shè)計(jì)和控制提供了較精確的模型基礎(chǔ),主要工作如下： 針對(duì)LCC諧振變換器在不同頻率下的響應(yīng)特點(diǎn),分析給出了以逆變橋和整流橋?qū)ǚ较驗(yàn)橐罁?jù)的諧振變換器拓?fù)涞刃У囊话阈圆襟E,推導(dǎo)在不同拓?fù)湎孪到y(tǒng)的狀態(tài)方程和狀態(tài)變量的表達(dá)式,分析了逆變橋不同結(jié)構(gòu)和諧振元件初始儲(chǔ)能對(duì)狀態(tài)變量響應(yīng)軌跡的影響；分析了開(kāi)關(guān)周期內(nèi)能量傳遞的過(guò)程,并在穩(wěn)態(tài)電壓恒定的基礎(chǔ)上提出了諧振回路與負(fù)載側(cè)能量平衡的數(shù)學(xué)描述。 針對(duì)較低開(kāi)關(guān)頻率下的零電流開(kāi)關(guān)運(yùn)行,研究了LCC諧振變換器在斷續(xù)電流模式下的工作過(guò)程及數(shù)學(xué)描述：提出了根據(jù)輸出電壓范圍判斷變換器等效拓?fù)浣惶嫘蛄械囊罁?jù)。在等效拓?fù)涞臓顟B(tài)空間方程基礎(chǔ)上,利用迭代法推導(dǎo)了諧振電流、諧振電壓及負(fù)載側(cè)整流電流與輸出電壓間的解析表達(dá)式。根據(jù)該表達(dá)式分別推導(dǎo)了諧振電流正負(fù)半波持續(xù)時(shí)間及總響應(yīng)時(shí)長(zhǎng),并提出了滿足零電流開(kāi)關(guān)的最優(yōu)驅(qū)動(dòng)脈寬概念及相應(yīng)的配置原則；建立了負(fù)載與開(kāi)關(guān)頻率對(duì)輸出電壓的共同作用關(guān)系,分析了串并聯(lián)電容比對(duì)輸出電壓增益的影響。通過(guò)數(shù)字仿真和實(shí)驗(yàn)的方式驗(yàn)證了解析模型的正確性。 針對(duì)較高開(kāi)關(guān)頻率下的零電壓開(kāi)關(guān)運(yùn)行,研究了LCC諧振變換器在連續(xù)電流模式下的工作過(guò)程及數(shù)學(xué)描述：通過(guò)驅(qū)動(dòng)信號(hào)閉鎖時(shí)刻與負(fù)載整流器導(dǎo)通時(shí)刻的相互關(guān)系,確定了變換器等效拓?fù)涞慕惶嫘蛄?推導(dǎo)了不同序列下諧振電流和諧振電壓的相互作用關(guān)系；針對(duì)穩(wěn)定感性運(yùn)行兩種特解情況,求得了開(kāi)關(guān)頻率、負(fù)載、輸出電壓增益三者的映射關(guān)系,將特解推廣到一般情況分別得到了不同交替順序下變換器的約束方程,給出了以虛擬角度定義域分析為基礎(chǔ)的方程求解過(guò)程；分析指出了變換器出現(xiàn)連續(xù)電流容性運(yùn)行的原因及條件,提出了嚴(yán)格意義上滿足變換器連續(xù)電流感性運(yùn)行的開(kāi)關(guān)頻率和負(fù)載變化范圍；總結(jié)歸納了連續(xù)電流模式變換器穩(wěn)態(tài)求解的一般性過(guò)程,得到了變換器在連續(xù)電流模式不同序列下的精確電壓增益曲線,分析了開(kāi)關(guān)頻率和負(fù)載品質(zhì)因數(shù)對(duì)增益的影響趨勢(shì),驗(yàn)證了所得數(shù)學(xué)模型具有較高精確度的特點(diǎn)；提出了滿足開(kāi)關(guān)器件零電壓開(kāi)關(guān)的驅(qū)動(dòng)信號(hào)占空比范圍,分析了開(kāi)關(guān)頻率和負(fù)載電阻變化對(duì)功率因數(shù)的影響。
[Abstract]:High frequency operation is an important way to realize high power density and high integration of power electronic converters. The resonant converter has good soft switching advantages. It can realize the zero voltage switch or zero current switch of the device by its own circuit environment, which is beneficial to reduce the loss of the converter. The LCC resonant converter takes into account the resonant variation of two elements. The advantages of the converter, which have the ability to resist the open and short circuit of the load and the parasitic parameters of the transformer, are a common circuit structure for the high voltage DC power supply. This paper compares and compares the shortcomings of the current modeling method to the nonlinear characteristics of the converter and the key problems to be solved in the precise model building. The state space method is used to solve the precise modeling and switching characteristics analysis in different current modes of the converter, which provides a more accurate model base for the design and control of the converter. The main work is as follows:
In view of the response characteristics of the LCC resonant converter at different frequencies, the general steps of the topology equivalence of the resonant converter based on the direction of the inverter bridge and the rectifier bridge are given. The expressions of state equations and state variables are derived under different topologies, and the initial energy storage of the different structural and harmonious components of the inverter bridge is analyzed. The influence of the state variable response path, the process of energy transfer in the switch period is analyzed, and the mathematical description of the energy balance of the resonant circuit and the load side is put forward on the basis of steady state voltage.
In view of the zero current switching operation under low switching frequency, the working process and mathematical description of the LCC resonant converter in intermittent current mode are studied. The basis for judging the equivalent topological alternating sequence of the converter based on the output voltage range is proposed. On the basis of the state space path of the equivalent topology, the resonant electricity is derived by the iterative method. The analytical expression between the current and the output voltage of the resonant voltage and the load side of the current and the output voltage is derived. According to this expression, the positive and negative half wave duration and the total response time of the resonant current are derived respectively. The concept of the optimal width of the drive width and the corresponding configuration principle for the zero current switch are proposed, and the output voltage of the load and the switching frequency is established. The influence of series parallel capacitance ratio on output voltage gain is analyzed. The correctness of the analytical model is verified by digital simulation and experiment.
In view of the zero voltage switching operation under high switching frequency, the working process and mathematical description of the LCC resonant converter in the continuous current mode are studied. The alternating sequence of the equivalent topology of the converter is determined by the relationship between the time of the driving signal locking and the conduction time of the load rectifier, and the resonant current under different sequences is derived. The relationship between the resonant voltage and the interaction of the resonant voltage is obtained. The mapping relation between the switching frequency, the load and the output voltage gain is obtained for the two special solutions of the stable inductive operation. The special solution is generalized to the general case, and the constraint equations of the converter under the different alternation order are obtained, and Fang Chengqiu based on the domain analysis of the virtual angle is given. The cause and the condition of the continuous current capacitive operation of the converter are pointed out. The switching frequency and the load change range of the continuous current in the converter are strictly satisfied. The general process of steady state solution of the continuous current mode converter is summarized, and the continuous current mode is obtained. The influence trend of the switching frequency and the load quality factor on the gain is analyzed under the precise voltage gain curves under different sequences, and the high precision of the mathematical model is verified. The duty cycle of the driving signal to meet the switching device zero voltage switch is proposed, and the change of the switching frequency and the load resistance change to the power cause is analyzed. The influence of number.

【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM46

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本文編號(hào)：1856491