The 12V2A power adapter manufacturer tells you that the power adapter may sometimes be interfered by external factors during use, so how should we solve this interference?

The 12V2A power adapter manufacturer tells you that the external interference to 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. On the one hand, it can enhance the design of the input/output filter circuit, improve the performance of the active power factor compensation (APFC) circuit, reduce the voltage and current change rates of the switching tube, rectifier and freewheeling diode, and adopt various soft switching circuit topology. On the other hand, strengthen the shielding effect of the chassis, improve the gap leakage of the chassis, and carry out good grounding treatment.
For external anti-interference capabilities, such as surges and lightning strikes, the lightning protection capabilities of the AC input and DC output ports should be optimized. The 12V2A power adapter manufacturer tells you that the lightning strike can be solved by a combination of zinc oxide varistor and gas discharge tube. For electrostatic discharge, use TVS tube and corresponding grounding protection, increase the distance between large and small signal circuits and the chassis, or select devices with anti-static interference to solve the problem.
To reduce the internal interference of the power adapter, you should start from the following aspects: 12V2A power adapter manufacturers tell you to pay attention to single-point grounding of digital circuits and analog circuits, single-point grounding of high-current circuits and small currents, especially current and voltage sampling circuits, to avoid single-point grounding of digital circuits and analog circuits. Reduce common resistance interference, reduce the influence of ground loop; pay attention to the spacing between adjacent lines and signal properties when wiring to avoid crosstalk; reduce ground wire impedance; reduce high-voltage and high-current lines, especially the primary side of the transformer and the switch tube , the area surrounded by the power supply filter capacitor circuit; reduce the area surrounded by the output rectifier circuit, the freewheeling diode circuit and the DC filter circuit; reduce the leakage inductance of the transformer and the distributed capacitance of the filter capacitor; use filter capacitors with high resonant frequency, etc. .
In terms of propagation paths, appropriately add components such as TUS with high anti-interference ability, high-frequency capacitors, ferrite beads, etc. to improve the anti-interference ability of small-signal circuits; small-signal circuits that are close to the chassis should be Add appropriate insulation and withstand voltage treatment, etc.; the radiator of the power device and the electromagnetic shielding layer of the main transformer should be properly grounded; the large-area grounding between each control unit should be shielded with a grounding plate; the 12V2A power adapter manufacturer tells you that on the rectifier rack , to consider the electromagnetic coupling between the rectifiers, the layout of the ground wire of the whole machine, etc., to improve the stability of the internal work of the power adapter.