摘要
分析了双极性SPWM调制下单相全桥逆变器产生共模噪声的机理,提出一种数字化闭环控制的共模电磁干扰抑制技术,指出控制系统的反馈量是一个既能快速反映共模噪声大小又方便计算的单值指标。研究了三种不同工作状态下共模电流频谱最大值、频谱平均值和共模电流能量三种评估指标与逆变器对管驱动脉冲延时之间的关系,并比较了三种评估指标的计算量。研究结果表明,共模电流能量的获得不需进行快速傅里叶变换,同时共模电流能量与对管驱动脉冲延时之间的关系在不同的工作状态下基本相同。说明了共模电流能量是一个理想的快速评估共模噪声干扰的指标。
Mechanism of common mode noise produced in single-phase full-bridge converter with bipolar SPWM is analyzed. Technology of the common-mode EMI suppression controlled by digital closed-loop is presented. The feedback of control system is a single-value indicator that can quickly reflect and calculate the size of common-mode noise. The paper studies the relationship between inverter-driven pulse delay of the tube and three evaluating index including com- mon-mode current spectrum maximum, the average spectrum and common mode current energy. It also compares computatianal complexity of the three types of indicators. The results show that the common mode current energy does not require achieving rapid Fourier transformation. Meanwhile, the relationship between common mode current energy and the pulse delay in different working states is basically the same. The paper reveals the common mode current energy is an ideal indicator of rapid assessing noise.
出处
《华东交通大学学报》
2009年第4期67-73,共7页
Journal of East China Jiaotong University
基金
江西省教育厅青年基金项目(GJJ09506)
华东交通大学校立科研基金项目(07DQ04)
关键词
单相全桥
评估方法
频谱最大值
频谱平均值
共模电流能量
single-phase full-bridge
evaluating method
maximal spectrum
average spectrum
common mode current energy
