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LED power supply of electromagnetic compatibility test time

Writer:www.turnmax-tech.comSource:东莞市腾茂电子有限公司 Date:2016-11-04
LED power points of electromagnetic compatibility test content: electromagnetic compatibility refers to: device or system in the common electromagnetic environment can work normally, and no any things in the environment can't afford to have the ability of electromagnetic interference.
There are generally two kinds of route of transmission, electromagnetic interference wave to evaluate by various means. One with a longer wavelength band to spread the power cord, to the launch pad to interfere with the way, generally below 30 MHZ. The longer wavelength frequency attached to electronic equipment within the scope of the power cord length less than one wavelength, the quantity of the radiation to the space is little, which can be master in LED power line voltage, which can fully assess interference, the size of the this kind of noise is called conduction.
When the frequency reaches more than 30 MHZ, shorter wavelength will follow. Adopted by directly determine the interference wave propagated to the space to evaluate the size of the noise, the noise is called radiation noise. There are three methods for determination of radiated noise of interference wave propagation space according to electric field intensity of direct measuring method and measuring leak to the method of power on the power cord.
Electromagnetic compatibility experiment includes the following contents:
(1) magnetic field sensitivity
The perturbation resistance () equipment, subsystem or system unwanted exposure to electromagnetic radiation response. The smaller the sensitivity level, the higher the sensitivity, interference resistance, the worse. Including fengfeng value of the fixed frequency, magnetic field test.
(2) the electrostatic discharge sensitivity
Objects close to each other with different electrostatic potential or direct contact with the charge transfer. 300 pf capacitor charging to - 15000 - v, through 500 Ω resistance discharge. Can be very bad, but after you put to normal. After testing, data transfer, storage cannot be lost.
(3) the LED power transient sensitivity
Including spike sensitivity (0.5, 10 mu mu s s 2 times), the transient voltage sensitivity (10% - 30%, 30 s recovery), frequency, transient sensitivity (5% - 10%, 30 s recovery).
(4) radiation sensitivity
Responsible for equipment relegation radiated interference field measurement. (14 KHZ - 1 GHZ, electric field intensity of 1 v/M).
(5) conduction sensitivity
When undesired response caused by equipment or cause the performance degradation, the jamming signal on power supply, control and signal lines or voltage measurement. (30 hz to 50 KHZ / 3 v, 50 KHZ to 400 MHZ / 1 v).
(6) non-work state interference magnetic field
Packing to 4.6 m, magnetic flux density is less than 0.525 mu T; 0.9 m, 0.525 mu T.
(7) working state interference magnetic field
Up, down, left, right, ac magnetic flux density is less than 0.5 mT.
(8) The interference was conducted interference propagation along a conductor. 10 KHZ to 30 MHZ, 60 dB mu V (48).
(9) Pet-name ruby radiated interference: through space in the form of electromagnetic wave propagation of electromagnetic interference. 10 KHZ - 1000 MHZ, 30 shielding room 60 mu V/m (54).

TypeInfo: Corporate News

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