基于医疗设备的辐射EMI噪声诊断与抑制技术研究

Research on noise diagnosis and suppression technology of radiation EMI based on medical equipment

针对电子信息系统在空间中以电磁波的形式产生辐射EMI噪声的问题,提出了两种抑制该噪声的理论模型,并给出了模型分别简化出的等效电路。该方法分别通过对基于电路传输线和时钟信号管脚引起的EMI噪声的理论模型进行了分析,并提出了噪声抑制的方法。通过在某医疗设备中对粉碎机的实验验证,结果表明对于由信息系统产生的EMI噪声通过抑制提高了10 d B/m,证明了该方法的可行性及正确性。

In this paper, we put forward two theoretical models to suppress the noise in the form of electromagnetic wave in the space of electronic information system, and put forward theoretical models to suppress the noise. The proposed method is based on the theoretical model of EMI noise caused by the circuit transmission line and the clock signal pin,and the method of noise suppression is proposed. Through is feasible and correct by the experimental verification of the crusher in a medical device,the results show that the method suppressing the EMI noise generated by the information system through the suppression of10dB V/m