有源医疗器械浪涌抗扰度分析

Analysis of Surge Immunity of Powered Medical Devices

随着我国医疗事业的发展,有源医疗器械愈发先进,现代化医院对于电子信息设备的依赖,使医院电磁环境问题日趋复杂。文章主要介绍浪涌对有源医疗器械的危害,浪涌是低压电路最频繁发生的电流波动和过电压现象,是影响医疗器械正常工作的最常见瞬态干扰,浪涌干扰的特点是干扰能量高、持续时间长,因此会对有源医疗器械造成不可恢复的损坏;浪涌干扰能量频率主要集中在低频(<1MHz),因而浪涌主要是通过传导的方式传播。研究浪涌现象要分析它的电压幅值以及电流和能量。有源医疗器械浪涌抑制要考虑电磁兼容和电压保护,通过讨论浪涌的波形和频谱,以数学模型为基础分析浪涌对有源医疗器械干扰的原因,最后结合具体案例得出相应的电磁兼容浪涌抑制(保护)措施。

With the development of Chinese medical industry, powered medical devices are becoming more and more advanced. The dependence of modern hospitals on electronic information equipment makes the problem of hospital electromagnetic environment more and more complex. This paper mainly introduces the harm of surge to powered medical devices. Surge is the most frequent current fluctuation and overvoltage phenomenon in low-voltage circuit and the most common transient interference affecting the normal operation of medical devices. Surge interference is characterized by high interference energy and long duration, so it will cause unrecoverable damage to active medical devices;The frequency of surge interference energy is mainly concentrated in low frequency(less than 1MHz), so the surge is mainly transmitted by conduction. To study the surge phenomenon, we should analyze its voltage amplitude, current and energy. Electromagnetic compatibility and voltage protection should be considered in the surge suppression of powered medical devices. This paper discusses the waveform and spectrum of surge, analyzes the causes of the interference of surge to powered medical devices based on the mathematical model, and finally obtains the corresponding electromagnetic compatibility surge protection measures combined with specific cases.