【摘要】：混沌現(xiàn)象是非線性電路中的一種固有的運動形式,在系統(tǒng)中如果出現(xiàn)混沌運動就會導致系統(tǒng)穩(wěn)定性受到影響,因此為了更好地避免、控制和利用混沌,需要充分了解混沌系統(tǒng)的混沌行為和混沌形成機理。開關變換器作為一種用途廣泛的具有非線性特性的電路,現(xiàn)已成為國內外科研的研究熱點。本文在混沌理論的基礎上,對開關變換器的混沌動力學特性進行深入分析,并對滿足無極燈使用要求的升壓變換器進行仿真與實驗驗證。首先,利用傳統(tǒng)混沌分析方法對典型混沌電路進行分析,從對典型混沌電路特性的驗證過程中突出了混沌理論用于分析非線性電路的優(yōu)勢。并且對于無極燈電路進行整體介紹,提取無極燈電路中的非線性部分,即升壓電路。其次,將混沌理論用于開關變換器的非線性電路特性研究。在傳統(tǒng)熵理論的基礎上提出多尺度熵理論,將其應用于DCMBuck變換器進行電路特性分析,驗證其正確性與可行性。之后運用多尺度熵理論對DCM Boost變換器內部混沌特性進行分析,并同信息熵與相對熵兩種傳統(tǒng)熵理論進行比較,得出多尺度熵雖與前兩種的分析方法不同,但其作用具有異曲同工之妙,而且相比于某些新型熵理論,多尺度熵理論所包含人為因素很少,實驗結果更為客觀。通過實驗可得,多尺度熵可以區(qū)分系統(tǒng)工作狀態(tài),而且系統(tǒng)多尺度熵值大小隨反饋參數(shù)的增大而增大,與系統(tǒng)初值無關。再次,對Boost變換器進行CCM模式下的離散建模,提出相鄰數(shù)據(jù)依賴性分析方法,與CCM模式下不同參數(shù)產生的系統(tǒng)相圖相結合,分析得到系統(tǒng)混沌現(xiàn)象的產生受到不同參數(shù)影響的敏感程度。最后,針對無極燈通常使用升壓電路,對Boost變換器進行Simulink建模,分析電路中升壓電感與儲能電容對系統(tǒng)輸出的影響。升壓電感更多的決定了輸出電壓的大小,而儲能電感則更多的影響電路的紋波電壓與到達穩(wěn)態(tài)所需時間的長短,無極燈適用的開關頻率范圍為15KHz-35KHz。升壓電路性能與電路各參數(shù)之間的關系的研究,為無極燈升壓電路參數(shù)的選取提供一定的理論依據(jù)。
[Abstract]:Chaos is an inherent form of motion in nonlinear circuits. If chaotic motion occurs in the system, the stability of the system will be affected, so in order to better avoid, control and utilize chaos, It is necessary to fully understand the chaotic behavior and chaos formation mechanism of chaotic systems. As a widely used circuit with nonlinear characteristics, switching converter has become a hot research topic at home and abroad. In this paper, based on the chaos theory, the chaotic dynamic characteristics of the switching converter are deeply analyzed, and the boost converter which meets the requirements of the induction lamp is simulated and verified by experiments. Firstly, the traditional chaotic analysis method is used to analyze the typical chaotic circuits, and the advantages of chaos theory in analyzing nonlinear circuits are highlighted in the process of verifying the characteristics of typical chaotic circuits. The induction lamp circuit is introduced as a whole, and the nonlinear part of the induction lamp circuit is extracted, that is, the boost circuit. Secondly, chaos theory is applied to the study of nonlinear circuit characteristics of switching converters. Based on the traditional entropy theory, the multi-scale entropy theory is proposed and applied to the circuit characteristic analysis of DCMBuck converter to verify its correctness and feasibility. Then the chaos characteristics of DCM Boost converter are analyzed by using multi-scale entropy theory, and compared with the two traditional entropy theories of information entropy and relative entropy, it is concluded that although the multi-scale entropy is different from the first two analysis methods, However, its effect is different, and compared with some new entropy theories, multi-scale entropy theory contains few human factors, and the experimental results are more objective. The experimental results show that the multi-scale entropy can distinguish the working state of the system, and the multi-scale entropy value of the system increases with the increase of feedback parameters, which is independent of the initial value of the system. Thirdly, the discrete modeling of Boost converter in CCM mode is carried out, and the method of adjacent data dependence analysis is proposed, which is combined with the system phase diagram generated by different parameters in CCM mode. The sensitivity of chaotic phenomena to different parameters is obtained. Finally, the Simulink model of Boost converter is carried out by using boost circuit for induction lamp, and the influence of boost inductance and energy storage capacitance on the output of the system is analyzed. The boost inductor determines the output voltage more, while the energy storage inductor affects the ripple voltage of the circuit and the time needed to reach the steady state more. The switching frequency range of the induction lamp is 15KHz 鈮，

本文編號：2479272