摘要
工频干扰存在于各种数据采集系统中，直接影响被测信号的测量精度．针对电网频率波动的实际情况，基于双T型阻容有源陷波电路，设计了可以滤除频带在49．5～50．5也之间工频干扰的陷波电路．详细地分析了所设计陷波电路的陷波深度与被测信号失真的关系，并给出了其幅相特性．提出的陷波电路信噪比可达60dB以上．通过仿真试验验证了设计的陷波电路具有较好的滤波效果．
Power interference exists in diversified data acquisition system. It directly affects the precision of measured signal. Aiming at actual instance that the frequency of electric network is waving, based on twin- T resistance- capacitance active- trap filter, a trap filter which can filter the power interference between 49.5Hz and 50. 5Hz is designed. The relation between the depth of the notch and the distortion of measured signal is amply analyzed. The amplitude- frequency character and phase- frequency character is given. The signal- to- noise ratio of the designed trap filter is more than 60dB. The emultional experimentation proves that the desigr can reach good filter effect.
出处
《佳木斯大学学报（自然科学版）》
CAS
2007年第1期5-6,13,共3页
Journal of Jiamusi University：Natural Science Edition
关键词
信号采集
工频干扰
陷波电路
signal acquisition
power interference
trap filter
作者简介
任洪林（1961-），男，河北故城人，哈尔滨工业大学电气工程系副教授，主要从事电力系统分析与仿真及故障诊断研究．
