宽输入Boost电路的参数正弦微扰调整与镇定

Adjustment and stability control for wide range input voltage Boost converter with small sinusoidal perturbation

宽输入范围的Boost电路会跨越稳定和不稳定工作区,产生的混沌现象导致电路工作异常.以连续电流传导模式为基础,讨论Boost电路的参数正弦扰动调整与镇定过程,分析稳定状态和不稳定状态在不同正弦扰动幅度下的相互转化过程,推导电路工作状态转化的临界条件,研究宽输入范围时电路的可稳定条件.数字仿真说明参数正弦扰动不仅可以抑制不稳定电路的混沌现象,也可以使本身稳定的电路进入不稳定状态.对宽输入电压范围的Boost电路,可在一定区域内选择合适的扰动幅度,保证电路稳定可靠地起动、调整和镇定.

The Boost converter with wide range input voltage,operating at both stable section and unstable section,the chaos phenomenon makes the system work unsteadily. Based on continuous current conduction mode,the adjustment and stability control with small sinusoidal parameter perturbation for Boost converter are discussed. The transition process between stable state and unstable state for different perturbation amplitudes are analyzed in detail,the critical transition conditions between stable state and unstable state are deduced,and the stability conditions are also determined. It is shown by digital simulation that sinusoidal parameter perturbation can not only suppress the chaos phenomenon,but also cause the converter originally in steady state to turn into unsteady chaos state. The consistent and appropriate perturbation amplitude range can be selected for the wide range input voltage,so as to ensure the Boost converter to start,be adjusted and operate steadily and reliably.