摘要
Buck-Boost变换器中存在着电磁干扰过大,以及电感电流与输出电压的波纹过大的问题,通过引入随机扩频技术减小这些问题的方法已经得到广泛应用,但引入该方法后仍存在复杂的分岔与混沌现象。在对随机扩频技术进行分析后与建立了基于随机扩频技术的Buck-Boost变换器的精确离散迭代映射模型;研究了采用随机扩频技术后的Buck-Boost变换器中的非线性现象,通过运用MATLAB软件进行编程绘制了电感电流随电路参数变化的分岔图,证实了其中存在复杂的非线性行为,研究了随机扩频技术中各电路参数对Buck-Boost变换器中非线性行为的影响规律;研究表明运用参数微扰法可以抑制其中的分岔与混沌现象。为Buck-Boost变换器电路设计提供了理论基础。
The random spread-spectrum technology is widely used in the Buck-Boost converter to reduce electromagnetic interference and the output voltage and current ripple, but it still exists complex bifurcation and chaos phenomena. This paper analyzes the random spread-spectrum technology and the accurate discrete iterative model of Buck- Boost converter, and explores the nonlinear phenomena of the Buck-Boost converter with random spread-spectrum technology. The bifurcation diagrams of the inductance current as the circuit parameter changes are drawn through the MATLAB software, which proves that it has the plentiful nonlinear phenomena. It analyzes that the influence law of circuit parameters in spread-spectrum technology on nonlinear phenomena of Buck-Boost converter. It restrains the bifurcation and chaos phenomena by perturbation method. It provides theoretical foundation for circuit design of Buck-Boost converter.
出处
《电测与仪表》
北大核心
2017年第11期19-25,共7页
Electrical Measurement & Instrumentation
