source:Industry News Popular:adapter release time:2022-03-23 09:17:07 Article author:sznbone
The power adapter is a power supply conversion device for small portable electronic equipment and electronic appliances. It is generally composed of shells, transformers, inductors, capacitors, control ICs, PCB boards and other components. Its working principle is to convert AC input to DC output; press the connection The way can be divided into wall type and desktop type. Widely used in security cameras, set-top boxes, routers, light bars, massagers and other equipment. The adapter is essentially a switching power supply, so the EMC problem has attracted more and more attention. Next, we will focus on analyzing the causes and treatment measures of radiation interference.
The test of radiated interference includes electric field emission and magnetic field emission, the electric field emission is produced by du/dt, and the magnetic field emission is produced by di/dt. Note: Spatial capacitance is a channel for electric field emissions, and common mode currents can generate considerable electric field emissions.
1. Electric field emission is mainly generated in the following parts:
(1) The primary and secondary voltage changes, in which the amplitude of the primary winding voltage change is large, which plays a leading role in the electric field emission.
(2) The magnetic core is also an electric field emission source.
2. Solution
Laying a copper sheet on the bottom layer of the PCB of the system or adding a copper sheet or a single panel at the forehead can effectively reduce the electric field emission and common mode current.
(2) Magnetic field emission
1. Magnetic field emission analysis 1
The loop with high di/dt generates magnetic field emission through the parasitic inductance of the loop, and the current on the secondary side changes with a large amplitude, which plays a leading role in the magnetic field emission.
Solution:
The parasitic inductance of a high di/dt loop increases with loop area, so magnetic field emissions are critical to PCB design. The current loop area on the secondary side should be as small as possible, and the wiring should be as short and thick as possible.
Read recommendations:
Principle characteristics and classification of switching power supply
The latest article
S series S1000 energy storage mobile power supply
2021-03-18S series S900 energy storage mobile power supply
2021-03-18New ABS Fire Shell Gigabit ESD Protection POE Powered Adapter Power Supply 90W POE Injector
2021-03-18ShenZhen Factory OEM ODM AC DC Open Frame Switching Power Supply Manufacturer
2021-03-18130W bare board power supply
2021-03-1880W bare board power supply
2021-03-1872W bare board power supply
2021-03-1872W bare board power supply
2021-03-1860W bare board power supply (54V)
2021-03-1836W Open Frame Power Supply
2021-03-1836W Open Frame Power Supply
2021-03-1830W Open Frame Power Supply
2021-03-1810W Open Frame Power Supply
2021-03-187W Open Frame Power Supply
2021-03-187W Open Frame Power Supply
2021-03-18Amplifier + power supply
2021-03-1060W single power supply
2021-03-10Amplifier + power supply
2021-03-1027W single power supply
2021-03-10Amplifier + power supply
2021-03-1030W power amplifier power supply
2021-03-10144W power amplifier power supply
2021-03-1048W desktop
2021-03-1048W desktop
2021-03-1024W U.S. regulations
2021-03-1018W U.S. regulations 18W Wall-Mounted Power Adapter
2021-03-1018W U.S. regulations18W Wall-Mounted Power Adapter
2021-03-1018W European standard Power Adapter
2021-03-1018W European standard Power Adapter
2021-03-1018W U.S. regulations18W Wall-Mounted Power Adapter
2021-03-10The latest article
What are the types of mobile phone chargers and their functions?
2022-05-21Advantages of switching power adapters
2022-05-21Five core functions that the power adapter can achieve.adapter manufacture
2022-05-20Analysis of the importance of power adapters for notebooks.adapter Processor
2022-05-20Details of switching power supply in maintenance
2022-05-19Understand the precautions of the power adapter and be an expert in electricity safety
2022-05-19This is how the EMC interference of the switching power supply is generated.adapter wholesaler
2022-05-18The relationship between the nominal voltage and current of the power adapter.power adapter price
2022-05-18Five basic functions of notebook power adapters.adapter wholesaler
2022-05-17Lightning surge immunity test method.power adapter price
2022-05-17Switching power supply ripple source and control
2022-05-16Level 6 energy efficiency standard power adapter T series
2022-05-16Children sleeping with pacifiers are prone to tooth decay
2022-05-16Six methods to deal with the heating problem of switching power supply transformer
2022-05-14The principle of flyback switching power supply
2022-05-14Types of thermal protection for power adapters.adjustable power adapter
2022-05-13Summary of common faults of LED switching power supply
2022-05-13The power transistor should be used like this in the power adapter
2022-05-124 modulation methods of switching power supply
2022-05-12Some little knowledge about switching power supply
2022-05-11Laptop Power Adapter Troubleshooting Steps
2022-05-119 classification methods of switching power supply
2022-05-10Advantages and disadvantages of switching power supply current mode
2022-05-10Advantages and disadvantages of switching power supply current mode
2022-05-099 classification methods of switching power supply
2022-05-09Characteristics and working methods of PFC regulated switching power supply
2022-05-07Six maintenance rules for drone lithium batteries.manual charger power adapter
2022-05-07Reasons for Inrush Current in Switching Power Supply Design.adjustable power adapter
2022-05-06The optimal solution of drone power management solution!12w acdc power adapter
2022-05-06Characteristics of Switching Power Adapter Transient Loads
2022-05-05About
Product
Process
News
Recruitment
中文
Online consultation
Online map
中
