EMI, EMS and EMC - Knowledge

Today's power supply adapter manufacturers to do a little science, the power supply industry friends of EMI, EMS and EMC these three words can be said to be often heard, but the layman's friends may not know what to do, it does not matter, today to do a little science, respectively, to give you a talk about EMI, EMS and EMC.

EMI (Electro Magnetic Interference) direct translation is electromagnetic interference. This is a synthetic word, we should consider "electromagnetic" and "interference". The so-called "interference", refers to the equipment is interfered with after the performance degradation as well as the equipment to produce interference with the interference source of the two layers of meaning. The first layer of meaning, such as lightning to produce radio noise, motorcycle driving in the vicinity of the TV screen appeared after the snow, pick up the phone to hear the radio sound and so on.　　

So EMI standards and EMI testing is which part of the EMI? Of course, the second level of meaning, that is, the source of the interference, but also includes the electromagnetic energy before being interfered with. Next is "electromagnetic". If an electric charge is stationary, it is called static electricity. When different potentials move in unison, an electrostatic discharge occurs, generating a current around which a magnetic field is generated. If the direction and size of the current changes continuously, electromagnetic waves are generated. Electricity exists in a variety of states, and we collectively refer to all of these states as electromagnetic. So EMI standard and EMI testing is to determine the state of the electricity handled, decide how to detect, how to evaluate.

　EMS (Electro Magnetic Susceptibility) is directly translated as "Electromagnetic Sensitivity". It means the ease of performance degradation due to electromagnetic energy. In order to make it easy to understand, we compare electronic equipment to a human being, and electromagnetic energy to a cold virus, and sensitivity is whether or not it is easy to catch a cold. If it is not easy to catch a cold, it means that the immunity is strong, that is, the English word Immunity, that is, strong resistance to electromagnetic interference.

EMC (Electro Magnetic Compatibility) is directly translated as "Electromagnetic Compatibility". Meaning that the electromagnetic energy generated by the equipment neither to other equipment to produce interference, but also not other equipment electromagnetic energy interference ability. Like a blind man feeling an elephant, there is a big difference between what you feel and what is actually there. In particular, electromagnetic phenomena that are contrary to the design intent should be regarded as EMC problems.

Development and manufacturing of power supplies

Detection of electromagnetic energy, anti-electromagnetic interference test, statistical processing of test results, electromagnetic energy radiation suppression technology, natural electromagnetic phenomena such as lightning and geomagnetism, the impact of electric and magnetic fields on the human body, international standards of electric field strength, electromagnetic energy transmission paths, related standards and restrictions are included in EMC. These are the power adapter manufacturers today to talk about things, want to know more about the power adapter knowledge? Welcome to pay attention to the Eahunt power supply.

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