What is electromagnetic interference (EMI)?

Electromagnetic interference (EMI) is the generation of electromagnetic interference (EMI) from man-made sources (such as electrical and electronic equipment) or natural sources (such as lightning, solar glare, etc.).

Unwanted electromagnetic energy/signals (such as spots) may interfere with the operation of nearby electrical and electronic equipment.

Electromagnetic noise (EMI) is a common noise in motor drive inverters, DC-DC converters, SMPS, power supplies, etc.

It is generated or emitted during the operation of power supplies, electronic controls, inverters, microprocessors, clock circuits and other equipment, and is also from natural sources.

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Conducted EMI and radiated EMI are two types of EMI. Conducted EMI is high-frequency noise generated by electrical and electronic equipment during operation.

Electric current that flows through electrical conductors such as wires, PCB traces, or cables and can affect other connected devices on the same line

Radiated EMI is unwanted electromagnetic signals/waves that are emitted from the structure of a device and propagate through the air and interfere with/affect other nearby devices.

EMI/EMC filters only provide protection against conducted EMI, so they are often used in conjunction with shields that block radiated EMI.

Unshielded EMI filters can still transmit noise through the air, potentially interfering with or damaging equipment.

Adding a shield around the filter’s mounting point can effectively suppress all types of EMI. However, if there is

If the conductor length is short, the filter alone is sufficient. Often this filter is used in conjunction with a protective shield and other types of protection.

use.