how to eliminate electromagnetic interference

Eahunt, as a power adapter manufacturer with many years of rich production experience, has a hand in solving the problem of electromagnetic interference in adapters, and will teach you a few tips below. We can start from these three aspects according to the elements generated according to the electromagnetic compatibility:

1, reduce the interference signal

3, enhance the anti-interference ability of the product

2, cut off the propagation of interference signals

The external interference generated within the power adapter, such as power line harmonic current, power line conduction interference, electromagnetic field radiation interference, etc., can only be solved by reducing the interference. For example, you can enhance the design of the input/output filtering circuit, reduce the voltage and current change rate of the switching tube and rectifier, renewal diode, and use a variety of soft-switching circuit topology and control methods. You can also strengthen the shielding effect of the chassis, improve the chassis gap leakage, and good grounding.

If external factors affect the power adapter to generate electromagnetic interference, such as surge, lightning strike, should optimize the AC input and DC output port lightning protection capabilities. Lightning strikes can be solved by using a combination of zinc oxide varistors and gas discharge tubes and other methods. Electrostatic discharge generates electromagnetic interference, power adapter manufacturers can use some anti-static ability of the components, or the use of TVS tubes and the corresponding grounding protection.

In terms of the propagation path, you can improve the anti-interference ability of small signal circuits, such as increasing the high anti-interference ability of the TUS and high-frequency capacitors, ferrite beads and other components, power device heat sinks, main transformer electromagnetic shielding layer should be properly grounded; large area grounding between the various control units shielded with grounding plates; in the rectifier frame, consider the electromagnetic coupling between the rectifiers, the whole machine ground layout, etc., to Improve the stability of the internal work of the power adapter.

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