CAJ | 학술논문

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.
연구료전통맥관조제(PWM)공제개관변환기중일개중요현상:폐배조절기적수출신호여거치파비교신호발생다차절교도치개관빈솔승고차불능획득항정공제빈솔,심지계통불능은정수출공작.이상견적Buck、Boost개관변환기설계위례,연구료기우PWM-준활모공제이론적개관변환기대신호은정성조건,최종소득결론여경전“사파필배”이론상문합.방진결과험증료소제출이론적정학성.
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.