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Research on a High Frequency Active EMI Filter for Power Converters

功率变换器高频有源EMI滤波器的研究

基本信息

批准号：
09650311
负责人：
TAKAHASHI Isao
金额：
$ 1.86万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650311/
关键词：
Active Noise Filter Common Mode Noise EMI High Frequency Inverter Motor Leakage Current Noise Filter Switching Noise 漏れ電流補償電磁波用アクティブフィルタ高周波CT

项目摘要

This research is concerned to a high frequency active noise filter of electromagnetic interference (EMI) composed of active devices as transistors and a high frequency common mode current transformer(CT).The merits of this filter and the results obtained in this research are as follows ;1. Small size under 1 / 10 of volume and weight is obtained.2. Under 2% of the common mode current compared to the normal operation is realized. The result means the reduction of the common mode noise and leakage current.3. The common mode EMI noise can be reduced 35dB under the area of 3MHz. The active filter fits for low frequency area EMI filter under 1MHz. So combining a high frequency passive EMI filter upper 5MHz area, small size and high quality EMI filters can be realized.4. The filter is composed of a small ferrite CT and two complimentary transistors and a DC cut capacitor. Therefore, it can produce very economical price as under 1$.5. It needs no separate power source by feeding the power from DC link of the inverter.6. Low loss under 1W in 2kW PWM drive system is realized.7. The mechanism and the equivalent circuit of the leakage current of the inverter motor drive systems are cleared. Using the results, dv/dt of the inverrers and motor stray capacitance can be designed by simulation.8. The developed EMI active filter is already applied to industrial inverters and home air conditioner drive systems.

本文研究了一种由有源器件晶体管和高频共模电流互感器组成的高频电磁干扰有源滤波器。该滤波器的优点和本研究的结果如下：1。体积小，重量小于1 / 10。在2%的共模电流下实现正常工作。结果意味着共模噪声和漏电流的降低。在3MHz频段下，共模EMI噪声可降低35dB。有源滤波器适用于1MHz以下的低频区EMI滤波器。因此，结合5MHz以上频段的高频无源EMI滤波器，可以实现小尺寸、高质量的EMI滤波器。该滤波器由一个小型铁氧体CT和两个互补的晶体管和一个直流切断电容器组成。因此，它可以生产非常经济的价格低于1.5美元。它不需要单独的电源，由逆变器的直流链路供电。在2kW PWM驱动系统中实现了1W以下的低损耗。明确了逆变电机驱动系统漏电流产生的机理和等效电路。利用该结果，可以通过仿真设计逆变器和电机杂散电容的dv/dt值。所研制的电磁干扰有源滤波器已应用于工业逆变器和家用空调驱动系统中。