基于混沌理论的无极灯电路特性研究

发布时间：2019-05-17 17:06

【摘要】：混沌现象是非线性电路中的一种固有的运动形式,在系统中如果出现混沌运动就会导致系统稳定性受到影响,因此为了更好地避免、控制和利用混沌,需要充分了解混沌系统的混沌行为和混沌形成机理。开关变换器作为一种用途广泛的具有非线性特性的电路,现已成为国内外科研的研究热点。本文在混沌理论的基础上,对开关变换器的混沌动力学特性进行深入分析,并对满足无极灯使用要求的升压变换器进行仿真与实验验证。首先,利用传统混沌分析方法对典型混沌电路进行分析,从对典型混沌电路特性的验证过程中突出了混沌理论用于分析非线性电路的优势。并且对于无极灯电路进行整体介绍,提取无极灯电路中的非线性部分,即升压电路。其次,将混沌理论用于开关变换器的非线性电路特性研究。在传统熵理论的基础上提出多尺度熵理论,将其应用于DCMBuck变换器进行电路特性分析,验证其正确性与可行性。之后运用多尺度熵理论对DCM Boost变换器内部混沌特性进行分析,并同信息熵与相对熵两种传统熵理论进行比较,得出多尺度熵虽与前两种的分析方法不同,但其作用具有异曲同工之妙,而且相比于某些新型熵理论,多尺度熵理论所包含人为因素很少,实验结果更为客观。通过实验可得,多尺度熵可以区分系统工作状态,而且系统多尺度熵值大小随反馈参数的增大而增大,与系统初值无关。再次,对Boost变换器进行CCM模式下的离散建模,提出相邻数据依赖性分析方法,与CCM模式下不同参数产生的系统相图相结合,分析得到系统混沌现象的产生受到不同参数影响的敏感程度。最后,针对无极灯通常使用升压电路,对Boost变换器进行Simulink建模,分析电路中升压电感与储能电容对系统输出的影响。升压电感更多的决定了输出电压的大小,而储能电感则更多的影响电路的纹波电压与到达稳态所需时间的长短,无极灯适用的开关频率范围为15KHz-35KHz。升压电路性能与电路各参数之间的关系的研究,为无极灯升压电路参数的选取提供一定的理论依据。
[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，

本文编号：2479272