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The difference between EMI filter and EMC filter
Release time:
2025-04-15
EMI filter: capable of attenuating RF energy within the stopband range without attenuation or with minimal attenuation at the power frequency.
1、 Different functions
1. EMI filter: capable of attenuating RF energy within the stopband range without attenuation or with minimal attenuation at the power frequency.
2. EMC filter: connected in series to the relay control output terminal of instruments and automation control equipment, used to eliminate electromagnetic interference and spark interference generated during the on/off of various inductive loads such as contactors, solenoid valves, fans, water pumps, etc.
2、 Different functions
1. EMI filter: It is the preferred tool for electronic equipment design engineers to control conducted electromagnetic interference and radiated electromagnetic interference.
2. EMC filter: used in instruments and automation control systems to suppress and eliminate strong electromagnetic interference and electrical spark interference in industrial automation systems, calibrate on-site instruments and ensure the safe and reliable operation of automation control systems.
3、 Different characteristics
1. EMI filter: The metal shell of the filter must ensure good surface contact with the chassis shell, and the grounding wire must be properly connected; The input and output lines of the filter must be spaced apart and avoid parallelism to avoid reducing the efficiency of the filter; Twisted pair cables are preferred for connecting wires, which can effectively eliminate some high-frequency interference signals.
2. EMC filter: used to suppress power grid noise and high-frequency harmonics, as well as noise and high-frequency harmonics generated by switching power supplies. High performance price ratio and the ability to connect quickly. Higher insertion loss and lower leakage current.
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