News

Home  -  News  -  Industry News

Lightning surge immunity test method.power adapter price

source:Industry News Popular:adapter release time:2022-05-17 10:44:53 Article author:yu

  The national standard for the lightning surge immunity test of switching power adapters is GB/T17626.5, and two versions were released in China in 1999 and 2008, which are respectively the same as the international standards IEC61000-4-5:1995 and IEC61000-4-5. :2001 is the same. Since most domestic product standards have not been revised, the two standards GB/T17626.5-1999 and GB/T17626.5-2008 coexist in China.

Lightning surge immunity test method.power adapter price(图1)

  Lightning strikes are an extremely common natural phenomenon. According to statistics, there are more than 40,000 thunderstorm centers around the world, and there are 8 million lightning strikes every day, which means that there are about 100 lightning strikes every second on the earth. Therefore, the lightning surge resistance test of the switching power supply adapter can establish a common basis for evaluating the switching power supply when it is subjected to high-energy pulse interference.

  The standard mainly simulates indirect lightning strikes (switching power supplies usually cannot withstand direct lightning strikes), such as: ① the lightning strikes the outdoor power grid lines, and a large amount of current flows into the external lines or grounding resistance, resulting in interference voltage; ② indirect lightning strikes (such as between clouds or clouds (3) Lightning strikes the nearby objects, and the strong electromagnetic field established around them induces voltage on the external lines; 4) The lightning strikes the nearby ground, and the ground current passes through Interference introduced when a common ground system is used.

  In addition to simulating lightning strikes in nature, the power adapter's surge immunity test standard also mentions the interference introduced by the switching action in substations and other occasions, such as: ① the interference when the main power system is switched; ② the same power grid, in the The interference caused by the beating of some small switches near the switching power adapter; ③ switching thyristor equipment with resonant lines; ④ various systemic faults, such as short circuits and arcing faults between equipment grounding networks or grounding systems.

  1. Lightning surge immunity test method:

  ⑴ Layout and configuration according to the actual use and installation conditions of the test product, including some standards that will change the additional resistance that reflects the internal resistance of the waveform generator signal source.

  ⑵According to product requirements to determine the level of test voltage and test location.

  (3) On each selected test site, the positive and negative interferences should be added at least 5 times each, and the maximum repetition rate of each surge is 1 time/min. Because the protection devices used in most systems have a recovery period between surges, there is a problem with the maximum repetition rate when the equipment is tested for lightning surges.

  ⑷ Whether the injection of the surge wave should be synchronized with the input voltage of the switching power adapter. If there is no special provision, it is usually required to superimpose the lightning surge signal on the zero-crossing point and the positive and negative peak positions of the voltage waveform of the switching power adapter.

  ⑸ Considering the non-linearity of the voltage-current conversion characteristics of the equipment under test, the test voltage should be gradually increased to the specified value of the product standard to avoid possible artifacts in the test (at high test voltages, because there may be some A weak device breaks down, bypassing the test voltage, so that the test can pass. However, when the test voltage is low, since the weak device is not broken down, the test voltage is applied to the test equipment at full voltage, but the test fails.) .

  ⑹ Lightning surge signal should be added between line-line or line-ground. If the wire-to-ground test is to be carried out, and there is no special provision, the test voltage shall be applied between each wire and the ground in turn. But it should be noted that when doing the line-to-ground test, sometimes the standard requires the interference to be superimposed on two or more lines to the ground at the same time. At this time, the duration of the pulse is allowed to be reduced.


Read recommendations:

Low power Indian hot selling power adapter 5W

24 months warranty power supply 36 ~ 75VDC dc power supply

Customize 90 - 264Vac Input To 54V 2.77A Output Constant Voltage Ac To Dc Power Supply

Design of high-power and high-stability power adapter

How to Pick Reliable Power Supplies? (1)

Previous:Five basic functions of notebook power adapters.adapter wholesaler Back to list Next:This is how the EMC interference of the switching power supply is generated.adapter wholesaler

The latest article

Related Products

The latest article

2003-2004

2025-03-25

2004-2006

2025-03-25

2006-2008

2025-03-25

2009-2011

2025-03-25

2012-2014

2025-03-25

2014-2017

2025-03-25

2018-2022

2025-03-25

2022-2024

2025-03-25

2024-2025

2025-03-25

What are the types of mobile phone chargers and their functions?

2022-05-21

Advantages of switching power adapters

2022-05-21

Five core functions that the power adapter can achieve.adapter manufacture

2022-05-20

Analysis of the importance of power adapters for notebooks.adapter Processor

2022-05-20

Details of switching power supply in maintenance

2022-05-19

Understand the precautions of the power adapter and be an expert in electricity safety

2022-05-19

This is how the EMC interference of the switching power supply is generated.adapter wholesaler

2022-05-18

The relationship between the nominal voltage and current of the power adapter.power adapter price

2022-05-18

Five basic functions of notebook power adapters.adapter wholesaler

2022-05-17

Lightning surge immunity test method.power adapter price

2022-05-17

Switching power supply ripple source and control

2022-05-16

Level 6 energy efficiency standard power adapter T series

2022-05-16

Children sleeping with pacifiers are prone to tooth decay

2022-05-16

Six methods to deal with the heating problem of switching power supply transformer

2022-05-14

The principle of flyback switching power supply

2022-05-14

Types of thermal protection for power adapters.adjustable power adapter

2022-05-13

Summary of common faults of LED switching power supply

2022-05-13

The power transistor should be used like this in the power adapter

2022-05-12

4 modulation methods of switching power supply

2022-05-12

Some little knowledge about switching power supply

2022-05-11

Laptop Power Adapter Troubleshooting Steps

2022-05-11