一种基于ARM单片机与CPLD的数字轴角转换方法  

A Method of Digital to Shaft-angle Converting Using ARM Series MCU&CPLD

作　　者：孔祥通[1] 王春平[1] 孙书鹰[1] 李军[1] 

机构地区：[1]军械工程学院光学与电子工程系,石家庄050003

出　　处：《计算机测量与控制》2013年第2期496-498,共3页Computer Measurement &Control

基　　金："十一五"国防装备预研(40405020204)

摘　　要：介绍一种基于ARM单片机和CPLD的数字-轴角转换实现方法,采用PWM调制波控制全桥驱动电路的方式实现DSC;MCU通过查表法计算调制波对应占空比,CPLD根据地址及占空比完成对应通道的PWM调制信号的产生,全桥驱动器根据PWM信号控制由4个互补MOS管组成的H桥电路产生对应轴角的正余弦旋转变压器驱动信号并经Scott变压器得到可驱动同步机的三相信号从而实现同步机的驱动;采用查表法计算调制信号占空比,可提高运算效率及系统实时性能;利用PWM控制全桥驱动方式具有效率高、发热低等优点;经实验测试,系统精度可达0.5密位(20:1粗精结合),此外,对比其它传统DSC实现方法,实现简单,效费比高,满足实际需要。A method of Digital to Shaft--angle Converting using the ARM series MCU and CPLD has been introduced in this paper. The MCU mostly takes on the data operation, the CPLD generate the PWM signals based on the data from the MCU. The H--Bridge consists of 4 Complementary--linked MOSFET. For the duty cycle of the PWM signal is computed on the Shaft--angle, so after the H--Bridge and the Scott transformer the synchronous motor will be drived to work. The sine part of the modulate wave is calculated by checking the tables saving the sine value, so the operation is simple and get the better real--time performance. Based on the experiment, the accuracy is 0. 5rail （20：1 coarse and fine shaft angle combination）. Besides, this method has the anvantages of great efficiency, lower heat and cheap cost over other DSC method and fully meet the practical use.

关 键 词：数字-轴角转换 ARM CPLD 查表法 PWM 全桥驱动 

分 类 号：TP368[自动化与计算机技术—计算机系统结构]