Product EMC electromagnetic compatibility

EMC test mainly includes: spatial radiation, conduction, power radiation, magnetic field radiation, harmonics, voltage fluctuations, electrostatic, anti-radiation, fast pulse group, lightning strike, anti-conductive, power frequency magnetic field, voltage drop, low frequency transmission harassment. EMC rectification method: Electromagnetic interference: less than 30 MHz is propagated in a conduction manner, which is higher than 30 MHz to propagate in radiation. CE (conducted harassment) 1. In the frequency 9kHz-1 MHz, the power input is plus X capacitance and inductance (common mode, differential mode) or the parameter of the replacement capacitor and inductance. 2. In the frequency 500kHz-10MHz, the transformer is shielded; changing the parameters of the Y capacitor between the initial secondary stage of the transformer, or the contact inductive mode is adjusted. 3. In the frequency 10MHz-30 MHz, the magnetic beads or adjustment of the pin sleeve of the MOS tube and field effect tube. Be MOS tube is generally called the field effect tube. Different from the diode and the triode, the diode can only pass forward current, reverse cutoff, can not control, the triode is popular in small current, MOS tube, small voltage control The current, the input resistance of the MOS tube is very large, and the megapometh, it is easy to drive, but the price is higher than the triode, which is generally suitable for the case where the small voltage is controlled by the high voltage. The field effect of 20A or 25A is usually used in the inductor. Tube. RE (radiation harass) Audio and video products. 1. The crystal pins are paired with the capacitance and the two feet; on the clock signal line according to the corresponding frequency string magnetic beads. 2. On the data cable, the magnetic ring. 3. Mask the decoding board grounding or shield the source of interference. 4. Signal grounding method. (Multi-ground, serial, concurrent) Home appliances 1. Replace the motor carbon brush or motor inductor. 2. Motor carbon brush, plus Y capacitors or replace the capacitance parameters. 3. Power cord or control line cover magnetic ring. ESD 1. Shield IC ground. 2. Circuit components are safe distance. 3. Blocking the discharge path. 4. I / O PORT pin is connected to the housing. 5. Growth discharge path. EFT 1. A magnetic ring on the power cord. 2. Power input adds a co-mode inductor. 3. The capacitance is added to the test function on its abnormal circuit.

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