基于DSP56F807内部A/D实现交流采样的抗干扰设计  

AC sampling anti-interference design based on inner A/D of DSP56 F807

作　　者：景展[1] 

机构地区：[1]河海大学电气工程学院,江苏南京210098

出　　处：《电力自动化设备》2006年第1期83-85,共3页Electric Power Automation Equipment

摘　　要：描述了应用DSP56F807及其内部A/D实现交流采样的方法,对于出现的电磁干扰下的零漂问题,利用PSpice电路分析软件,对电路中使用的多种二阶滤波方案(无源二阶滤波,滤波电容接Uos或接地,无源二阶滤波加运放跟随,滤波电容接地以及有源二阶滤波电路中相应电路)进行分析,给出在该类应用中可行的无源二阶滤波、滤波电容一端接地方案,并解决了干扰下的零漂问题。分析基准电压回路的电路设计,通过增大并联电容或供电电源的容量,解决了动态工作下的零漂问题。A method of AC sampling applying DSP56F807 and its inner A/D converter is described. To solve the zero drift problem appeared in electromagnetic disturbance ,several 2 nd order filtering schemes are analyzed with PSpice ,including passive or active 2 nd order filter with or without amplifier and follow-up circuits while filtering capacitor connected to UOS or ground. A feasible scheme of passive 2nd order filter with one end of filtering capacitor grounded is presented. Based on the analysis of benchmark voltage circuit design,the zero drift in dynamic condition is solved by increasing capacitance of the parallel capacitor or the power supply.

关 键 词：DSP 单极性A/D 交流采样 抗干扰 二阶滤波 

分 类 号：TM930[电气工程—电力电子与电力传动] TN47[电子电信—微电子学与固体电子学]