摘要
提出了一种改进的Butterworth滤波方法,能够对逆变焊机副边反馈电流进行有效的滤波,使电流型PWM控制器能够在强干扰、高电压和大电流的恶劣环境下高速稳定地工作。首先对信号进行快速傅里叶变换,得到有用信号和噪声的频谱分布。在综合考虑了FPGA硬件实现处理速度后,设计了IIR Butterworth滤波器,结合移动中值平均滤波的方法改善了单纯Butterworth滤波器启动速度和给定变化较大时跟踪速度慢的缺点。仿真和实验结果表明,滤波器具有很好的滤波效果,较小的相移,动态响应快,能够保证逆变焊机精确可靠地工作。
A new method of improved Butterworth filter was proposed to denoise feedback vice-current of inverter effectively and make current-mode PWM controller work fast and steadily in the environment with strong interference,high voltage and large current.First,the signal was analyzed with fast fourier transformation to get the frequency spetrum of useful signal and noise.Then IIR Butterworth filter was designed after analysis of processing speed with FPGA realization.In order to improve the start and tracking speed,moving average median filter was proposed.The simulation and experiment results show the filter is characterized by small phase shift and fast dynamic response.All digital inverter can work accurately and reliably.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2009年第S2期311-314,共4页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(60374021)
山东省自然科学基金项目(Z2006F05)
