摘要
研究了传统脉宽调制(PWM)控制开关变换器中一个重要现象:闭环调节器的输出信号与锯齿波比较信号发生多次截交导致开关频率升高且不能获得恒定控制频率,甚至系统不能稳定输出工作.以常见的Buck、Boost开关变换器设计为例,研究了基于PWM-准滑模控制理论的开关变换器大信号稳定性条件,最终所得结论与经典"斜波匹配"理论相吻合.仿真结果验证了所提出理论的正确性.
The switch-mode power supply(SMPS) using a pulse width modulation(PWM) control method shows a potential unstable phenomenon that the output signal from the closed-loop compensation transfers the compared triangle signal several times in a switching cycle. Therefore, the quasi-sliding-mode control(SMC) theory is used to analysis the large-signal stability condition for the PWM controlled SMPS, such as the Buck and Boost converters. Finally, the simulation results show the correction of the proposed theory.
出处
《控制与决策》
EI
CSCD
北大核心
2013年第4期637-640,共4页
Control and Decision
基金
南京邮电大学科研启动基金项目(NY211019)
关键词
大信号稳定
斜波匹配
开关变换器
large-signal stability
slope matching
switch-mode power supply