伽马能谱仪中开关功率变换器非线性动力学行为

Study of Nonline Dynamical Behavior of Switching Power Converters in Gamma Spectrometer

为提高伽马能谱仪中开关功率变换器的工作稳定性,研究了开关功率变换器非线性行为的分析方法,其中包括数值仿真、理论分析和电路实验研究方法。以电压控制模式的Buck变换器为例,分析该变换器的工作过程,建立相应的数学模型,对该模型进行数值仿真,观察到该变换器的非线性行为。从理论上分析该现象的本质原因,通过电路实验来验证。最后,证明这3种方法对研究开关功率变换器非线性行为的可行性和准确性,为伽马能谱仪中开关功率变换器的设计提供理论指导。

The switching power converter is widely used in power conversion circuit,and the Gamma spectrometer provides power by switching power converter. This paper studies the analysis methods for complex behaviors of switching power converters,including numerical simulation method,theoretical analysis method,circuit experimental method to improve the operation stability of switching power converter in Gamma spectrometer. The work process of the converter is analyzed and the corresponding mathematical model is built up and simulated by taking voltage mode controlled Buck converter as an example. The nonlinear behavior can be found in the converter. The essence reason for the instability is obtained by theoretical analysis and the phenomenon can be verified by circuit. Finally,it can prove that three research methods of nonlinear behaviors to switching power converter are feasibility and accuracy. The result of study will provide theoretical guidance for the design of switching power converter in Gamma spectrometer.