磁悬浮飞轮用电磁轴承低纹波开关功放的实现

针对磁悬浮飞轮用两电平脉宽调制开关功放输出电流纹波大的缺点,提出了一种新颖的三电平脉宽调制开关功放.通过对两种开关功放输出电流纹波的理论估算,得出三电平脉宽调制开关功放可以大大降低电流纹波,进而实现开关功放的低纹波损耗.提出了一种基于SIMULINK的电路原理性仿真方法,该方法所建模型能准确地反映实际系统的特性,为开关功放的设计和调试提供指导.通过对两种开关功放的仿真和实验进行对比,最终表明仿真和实验结果相吻合,仿真和实验均验证了三电平脉宽调制开关功放对减小输出电流纹波的可行性、有效性.

Implementation of low ripple switching power amplifier for magnetically suspended flywheel system

To reduce the ripple current of standard two-level pulse width modulation(PWM) switching power amplifier for magnetically suspended flywheel system,a novel three-level PWM switching power amplifier was proposed.The ripple current of the switching power amplifier using two different PWM techniques was computed.The analysis results of ripple current indicate that the three-level PWM switching power amplifier can be used to significantly reduce the ripple current and meet the requirement for low power consumption.A novel simulation method of three-level PWM switching power amplifier was presented,based on SIMULINK.The method can analyze the characteristics of the system accurately and so offer direction for designing and debugging actual switching power amplifier.The comparison of a concrete switching power amplifier working in different PWM techniques by using simulation and experimental method was made.The agreement of the final simulation results with the experimental results indicates the proposed method is effective and feasible.