home > News > Industry News

How to solve the interference of the power adapter?

source:Industry News     Popular:adapter     release time:2021-07-27 10:51:45     Article author:sznbone    

  According to the elements of electromagnetic compatibility, solving the electromagnetic compatibility of the power adapter can start from three aspects:

  1, reduce the interference signal generated by the interference source

  2, cut off the propagation path of the interference signal

  3. Enhance the anti-interference ability of the interfered body

How to solve the interference of the power adapter?(图1)

  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 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 rate of change of the switch tube, rectifier, and freewheeling diode, and adopt various soft switching circuit extensions. Repair structure and control methods, etc.; on the other hand, strengthen the shielding effect of the case, improve the leakage of the gap of the case, and conduct a good grounding treatment.

  For external anti-interference capabilities, such as surges and lightning strikes, the lightning protection capabilities of 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 tubes and corresponding grounding protection, increase the distance between large and small signal circuits and the chassis, or select devices with anti-static interference. To reduce the internal interference of the power adapter, you should start with the following aspects: pay attention to the single-point grounding of the digital circuit and the analog circuit, the single-point grounding of the large current circuit and the small current circuit, especially the current and voltage sampling circuit, to reduce common resistance interference, Reduce the influence of the ground ring; pay attention to the distance between adjacent lines and the nature of the signal when wiring to avoid crosstalk; reduce the impedance of the ground line; reduce the high-voltage and large-current lines, especially the primary side of the transformer, the switch tube, and the power supply filter capacitor circuit. The area enclosed; 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 resonance frequency.

  In terms of transmission, appropriately increase TUS with high anti-interference ability, high-frequency capacitors, ferrite beads and other components to improve the anti-interference ability of small-signal circuits; small-signal circuits closer 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 the control units should be shielded with a grounding plate; on the rectifier rack, it should be considered between the rectifiers. Electromagnetic coupling, ground wire layout of the whole machine, etc., to improve the stability of the internal work of the power adapter.


Read recommendations:

EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter

MKS-1202000-36 Switching Power Supply

12W CAR CHARGER,12W USB CAR CHARGER,CAR CHARGER,12W CHARGER

Do you really understand mobile phone fast charging?

What should I do if the power adapter will get hot when summer is here?

Related Information

What are the unique advantages of high frequency switching power adapter

2022-04-20

General Mechanism Analysis of Switching Power Adapter.ac power adapter wholesaler

2022-04-19

Suppression method of low frequency ripple of switching power supply

2022-04-16

Why is the power adapter making noise?

2022-04-15

When the power adapter is in normal use, what is the normal temperature?

2022-04-14

90% of people use the car charger incorrectly, are you using it right?CAR POWER SUPPLY sales

2022-04-13

The difference between a power adapter and a voltage regulator

2022-04-12

Select the power adapter to determine these three adaptation conditions.SWITCHING POWER Vendor

2022-04-11

Why is the original power adapter better than the non-original one?TRANSFORMER Production

2022-04-09

What are the industries where the power adapter can be applied?CAR CHARGER wholesale

2022-04-08

What is the difference between high-end and low-end power adapters? How to check after playing,CAR P

2022-04-07

How to design a good power adapter,CAR CHARGER wholesaler

2022-04-07

Customized desktop power adapter

2022-04-06

The quality of the switching power supply determines the safety of electricity use,CAR CHARGER whole

2022-04-02

What are the advantages of wireless chargers?

2022-03-30

PD charger is a must-have at home

2022-03-29

What are the main materials of the power adapter shell?

2022-03-26

What is a PD power adapter? It can make charging ubiquitous

2022-03-25

Slow charging? Try a fast charger

2022-03-24

Do you understand the cause of abnormal noise in the power adapter?

2022-03-23

Reasons for abnormal noise of the power adapter

2022-03-22

Talking about the common problems of the power adapter

2022-03-19

General manufacturer power adapter reliability test items

2022-03-18

More energy efficient and safe power adapter

2022-03-17

Five ways to solve the power adapter overheating?

2022-03-16

What are the common connection faults of cottage shared chargers on the market?

2022-03-15

How to use the car charger and matters needing attention!

2022-03-14

Do you know the difference between a power adapter and a charger,CAR CHARGER Processor

2022-03-12

The power adapter has a very wide range of applications,Audio Transformer

2022-03-11

What is the development trend of the power adapter industry,AC ADAPTER

2022-03-10

Popular recommended products

500W Charger,Charger

2020-08-28

EI Power Transformer Power Transformer

2020-08-27

36-90W Charger,36W Charger,90W Charger,40W Charger,50W Charger

2020-08-27

24V21A LED Power Supply 24V Power Supply 21A Power Supply

2020-08-27

3-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply

2020-08-27

10-24W Charger,24W Charger,10W Charger

2020-08-27

MKS-120200EU-36 Switching Power Supply

2020-08-29

60W 6USB Charger,60W Charger,6USB Charger,Charger

2020-08-27

40W 4USB Charger,40W Charger,4USB Charger

2020-08-27

Inductance & Coil

2020-08-27

MKS-1203000EX Switching Power Supply

2020-08-29

30-500W LED Power Supply 30-500W Power Supply

2020-08-27

36-65W Switching Power Supply

2020-08-29

3-100W PCBA power supply 3-100W Customized power supply 3-100W power supply

2020-08-27

24W USB Charger,24W Charger,USB Charger

2020-08-27

EI-28 AC ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter Linear Adapter

2020-08-28

12W POWER SUPPLY,12W CAR POWER SUPPLY,POWER SUPPLY,CAR POWER SUPPLY

2020-08-27

12W CAR CHARGER,12W USB CAR CHARGER,CAR CHARGER,12W CHARGER

2020-08-27

19V2A 36W Switching Power Supply

2020-08-28

24W 2USB Charger,24W Charger ,2USB Charger

2020-08-27

12-36W POE POWER SUPPLY

2020-08-27

24-65W Switching Power Supply

2020-08-29

Transformer,Power Transformer,Ring Power Transformer

2020-08-27

30W PD Charger,30W Charger,PD Charger

2020-08-27

18-25W Switching Power Supply

2020-08-28

EI-57 ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter INTERCHANGEABLE ADAPTOR Li

2020-08-28

Transformer,High Frequency Transformer,Frequency Transformer

2020-08-27

MKS-1202000-36 Switching Power Supply

2020-08-29

EI-35 ADAPTER AC ADAPTER SWITCHING ADAPTOR Linear Power Adapter Linear Adapter

2020-08-28

12VDC8A 96W power supply

2020-08-28
Copyright 2020 © Merryking Technology Co., Ltd. All rights reserved