摘要
电压反馈型半桥DC-DC(VCHB DC-DC)变换器组成的开关电源系统是强非线性系统,为揭示其系统稳定性与电路参数之间的内在关系,对VCHB DC-DC变换器进行了研究.结合其实际闭环控制逻辑,利用VCHB DC-DC变换器精确状态方程,建立VCHB DC-DC变换器仿真模型,采用频闪映射对其状态变量进行离散迭代映射,推导其统一的离散数学模型.对不同参数下VCHB DC-DC变换器非线性特性进行仿真和数值分析,并进行相应实验验证.研究结果表明,变压器变比、滤波电容、储能电感和误差比例系数的改变对VCHB DC-DC变换器稳定性影响大,而误差积分系数和负载的变化对其影响较弱.研究成果可为VCHB DC-DC变换器实际应用时的电路参数选取提供指导.
Voltage-feedback half-bridge DC-DC converter,namely VCHB DC-DC,a dominant component of SMPS system,has rich dynamical characteristic.For revealing internal relation between system stability and circuit parameters,VCHB DC-DC converter was studied in detail.According to practical closed-loop control logic,the general simulation model was set up by using the exact state equations.And the general discrete mathematical model was deduced by stroboscopic maps.Nonlinearity characteristic of VCHB DC-DC converter under different parameters was simulated and analyzed by numerical method.Experimental results show that VCHB DC-DC converter is sensitive to transformer ratio,filter capacitor,inductive storage and error scale factor,while it is not sensitive to changes in error integral coefficient and load.The research results could serve as guidance for circuit parameters selection in VCHB DC-DC converter application.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2012年第9期791-797,共7页
Journal of Tianjin University(Science and Technology)
基金
国家自然科学基金资助项目(60874077)
质检公益性行业科研专项经费资助项目(200910097
201010057)
