EMC (Electro Magnetic Compatibility) refers to the ability of a device or system to operate as required in its electromagnetic environment without causing intolerable electromagnetic interference to any device in its environment.
The main research objects of electromagnetic compatibility (EMC): 1. Various man-made noises, such as corona noise of transmission lines, automobile noise, noise of the contactor itself and noise caused by discharge when the conductor is turned on, electrical locomotive noise, urban noise, etc.
2. The mutual influence of various public utility equipment (transmission lines, communications, railways, highways, petroleum metal pipelines, etc.) in the corridor.
3. Reflection problems caused by large buildings such as super high-rise buildings, transmission lines, and iron towers.
4. The effects of the electromagnetic environment on humans and various organisms.
These include the effects of power frequency fields such as strong wires, medium, short wave and microwave electromagnetic radiation.
5. The influence of nuclear electromagnetic pulse.
The electromagnetic pulse generated by a high-altitude nuclear explosion can destroy command, control, communications, computers and reporting systems on the ground in a large area.
6. TEMPEST technology.
Its essence is a series of research work carried out from the aspects of information reception and protection to address the problems of electromagnetic radiation and information leakage of information equipment.
Extended information: Basic principles of electromagnetic compatibility design (EMC): 1. Grounding is a very important issue for electronic equipment.
Grounding has three purposes: 1. Grounding enables all unit circuits in the entire circuit system to have a fair reference zero potential, ensuring that the circuit system can operate stably.
2. Prevent interference from external electromagnetic fields.
Grounding the casing allows a large amount of charges accumulated on the casing due to electrostatic induction to be discharged through the earth. Otherwise, the high voltage formed by these charges may cause spark discharges inside the equipment and cause interference.
3. Ensure safe work.
When direct electromagnetic induction of lightning occurs, damage to electronic equipment can be avoided; when the input voltage of the power frequency AC power supply is directly connected to the casing due to poor insulation or other reasons, electric shock accidents to operators can be avoided.
2. Screen 1. Shielding is the metal isolation between two spatial areas to control the induction and radiation of electric fields, magnetic fields and electromagnetic waves from one area to another.
2. Use shielding to surround the interference source of components, circuits, assemblies, cables or the entire system to prevent the interference electromagnetic field from spreading outward; use shielding to surround receiving circuits, equipment or systems to prevent them from being affected by external electromagnetic fields.
Impact.
3. Because the shielding body absorbs energy, reflects energy and offsets energy from external interference electromagnetic waves and internal electromagnetic waves from wires, cables, components, circuits or systems, etc., the shielding body has the function of weakening interference.