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Solve the power adapter interference problem, use the following solutions!

Solve the power adapter interference problem, use the following solutions!

[Abstract]:
Thepoweradaptermaysometimesbedisturbedbyexternalfactorsduringuse.Howcanwesolvethisinterference?Externaldisturbancesgeneratedbythepoweradapter,suchasthepowerlineharmoniccurrent,powerlineconductioninter
The power adapter may sometimes be disturbed by external factors during use. How can we solve this interference?
External disturbances generated by the power adapter, such as the power line harmonic current, power line conduction interference, electromagnetic field radiation interference, etc., can only be solved by reducing interference. On the one hand, the design of the input/output filter circuit can be enhanced, the performance of the active power factor compensation (APFC) circuit can be improved, and the voltage and current change rate of the switch tube and the rectifying and freewheeling diode can be reduced. Various soft-switching circuit designs are used. Supplementary structure and control methods; on the other hand, to strengthen the shielding effect of the chassis, improve the gap leakage of the casing, and conduct a good grounding treatment.

 

For external anti-jamming capabilities, such as surges and lightning strikes, the lightning protection capability of the AC input and DC output ports should be optimized. Lightning strikes can be solved by a combination of zinc oxide varistors and gas discharge tubes. For electrostatic discharge, use TVS tube and corresponding grounding protection, increase the distance between the signal circuit of the size and the chassis, or use the device with anti-static interference to solve.
To reduce the internal interference of the power adapter, we should start from the following aspects: Note that the single-point grounding of the digital circuit and the analog circuit, the high-current circuit and the small current, especially the single-point grounding of the current and voltage sampling circuit, to reduce the common-resistance interference, Reduce the influence of the ground loop; Pay attention to the distance between the adjacent lines and the signal properties when wiring, to avoid crosstalk; Reduce the impedance of the ground wire; Reduce the high voltage and large current lines, especially the transformer primary and switch, power supply filter capacitor circuit Enclosed area; reduce the area enclosed by the output rectifier circuit and 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 a filter capacitor with a high resonant frequency.
In terms of transmission methods, TUS and high-frequency capacitors, ferrite beads, and other components with high anti-jamming capability should be appropriately increased to improve the anti-jamming ability of small-signal circuits; small-signal circuits that are closer to the chassis should be used. Add appropriate insulation withstand voltage processing; radiator of power device, electromagnetic shielding layer of main transformer should be properly grounded; large-area grounding between each control unit should be shielded by grounding plate; in the rack of rectifier, each rectifier should be considered Electromagnetic coupling, overall ground layout, etc., to improve the stability of the internal work of the power adapter.
More power adapter information, please pay attention to the power adapter, charger manufacturers, Shenzhen Cable Source Technology Co., Ltd.!
(The above information is collected from the network)