一种适用于PWM驱动的滤波方法  

Filter method for pulse width modulation drive

作　　者：刘长亮[1] 邓益 王自成 蒲培培 李超[1] 吴玉敬[1] 张璟玥[1] LIU Changliang;DENG Yi;WANG Zicheng;PU Peipei;LI Chao;WU Yujing;ZHANG Jingyue(Xi'an Institute of Applied Optics,Xi'an 710065,China;Xi'an Institute of Modern Control,Xi'an 710061,China;Xi'an Daoyin Technology Co.,Ltd.,Xi'an 710076,China)

机构地区：[1]西安应用光学研究所,陕西西安710065 [2]西安现代控制研究所,陕西西安710061 [3]西安导引科技有限责任公司,陕西西安710076

出　　处：《应用光学》2022年第5期859-863,共5页Journal of Applied Optics

基　　金：国防专项任务(201906)。

摘　　要：脉冲宽度调制(pulse width modulation,PWM)驱动是现有伺服控制系统的关键构成,因此在直流电机前端对脉宽信号进行差模滤波与共模滤波尤为重要。以某光电惯性稳定平台WSA38M功放模块为标的搭建滤波电路,分析PWM驱动开关频率导致电机发热和产生电磁耦合干扰的原因,运用公式计算LC滤波电路的电气参数,并进行优化仿真。测试和电磁兼容实验结果表明:优化后的电路性能优良,尤其是在22 kHz~53 kHz频段对系统干扰较小,容易满足整体指标要求,为控制系统设计提供了可靠的依据。The pulse width modulation(PWM) drive plays a pivotal part in the servo driving system.Therefore, the filters become more important in differential mode and common mode for pulse width signal ahead of direct current motors. The filter circuit was built with the WSA38M power amplifier module in a photoelectric inertial stabilized turret. The PWM drive switch frequency was analyzed, which caused motor heating and electromagnetic coupling interference. The electric parameter of LC filter was calculated and the optimization simulation was carried out. The results of test and electromagnetic compatibility experiments show that the optimized electrical performance is excellent, especially the 22 kHz~53 kHz frequency band has less interference to the system, which is easy to meet the overall index requirements, and provides a reliable basis for the control system design.

关 键 词：PWM驱动 差模滤波 开关频率 耦合干扰 

分 类 号：TN702[电子电信—电路与系统]