VMIVME-7700-111000 整流电路会产生谐波电流，这种谐波电流在供电系统的阻抗上产生电压降，导致电压波型发生畸变，这种畸变的电压对于许多电子设备形成干扰（因为大部分电子设备仅能工作在正弦波电压条件下），常见的电压畸变是正弦波的顶部变平。谐波电流一定时，电压畸变在弱电源的情况下更加严重，这种干扰的特征是会对使用同一个电网的设备形成干扰，而与设备与变频器之间的距离无关；由于负载电压为脉冲状，因此变频器从电网吸取电流也是脉冲状，这种脉冲电流中包含了大量的高频成分，形成射频干扰，这种干扰的特征是会对使用同一个电网的设备形成干扰，而与设备与变频器之间的距离无关；射频辐射干扰来自变频器的输入电缆和输出电缆。在上述的射频传导发射干扰的情形中，变频器的输入输出电缆上有射频干扰电流时，由于电缆相当于天线，必然会产生电磁波辐射，产生辐射干扰。
VMIVME-7700-110000
变频器输出电缆上传输的PWM电压，同样包含丰富的高频的成分，会产生电磁波辐射，形成辐射干扰。辐射干扰的特征是，当其他电子设备靠近变频器时，干扰现象变得严重。根据电磁学的基本原理，形成电磁干扰必须具备三要素：电磁干扰源、电磁干扰途径、对电磁干扰敏感的系统。为防止干扰，可采用硬件抗干扰和软件抗干扰。其中，硬件抗干扰是*基本和*重要的抗干扰措施，一般从抗和放两方面入手来抑制干扰，其总体原则是抑制和消除干扰源、切断干扰对系统的耦合通道、降低系统干扰信号的敏感性。具体措施在工程上可采用隔离、滤波、屏蔽、接地等方法。
VMIVME-7700-110000
The VMIVME-7700-111000 rectifier circuit generates harmonic currents, which generate voltage drops on the impedance of the power supply system, leading to voltage waveform distortion. This distorted voltage causes interference to many electronic devices (as most electronic devices can only operate under sine wave voltage conditions), and the common voltage distortion is the flattening of the top of the sine wave. When the harmonic current is constant, voltage distortion is more severe in the case of weak power sources. The characteristic of this interference is that it will form interference on equipment using the same power grid, regardless of the distance between the equipment and the frequency converter; Due to the pulse like load voltage, the current drawn by the frequency converter from the power grid is also pulse like. This pulse current contains a large amount of high-frequency components, forming radio frequency interference. The characteristic of this interference is that it will cause interference to equipment using the same power grid, regardless of the distance between the equipment and the frequency converter; RF radiation interference comes from the input and output cables of the frequency converter. In the case of RF conducted emission interference mentioned above, when there is RF interference current on the input and output cables of the frequency converter, as the cable acts as an antenna, electromagnetic wave radiation will inevitably be generated, resulting in radiation interference.
VMIVME-7700-110000
The PWM voltage transmitted on the output cable of the frequency converter also contains rich high-frequency components, which can generate electromagnetic wave radiation and form radiation interference. The characteristic of radiation interference is that when other electronic devices are close to the frequency converter, the interference phenomenon becomes severe. According to the basic principles of electromagnetics, the formation of electromagnetic interference must have three elements: electromagnetic interference sources, electromagnetic interference pathways, and systems sensitive to electromagnetic interference. To prevent interference, hardware anti-interference and software anti-interference can be used. Among them, hardware anti-interference is a basic and important anti-interference measure, which generally starts from the aspects of anti-interference and amplification to suppress interference. The overall principle is to suppress and eliminate interference sources, cut off the coupling channel of interference to the system, and reduce the sensitivity of system interference signals. Specific measures can be taken in engineering, such as isolation, filtering, shielding, grounding, etc.
VMIVME-7700-110000
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