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What are the hidden faults in the power adapter plugs?


With the development of the Internet, most power adapters are connected to many appliances. With the advent of the high-speed economic era, people's homes have been equipped with a lot of electrical appliances. These appliances, however, require a power adapter. Only a good use of power adapters, in order to better development. In today's economy, what we need to do is buy an efficient power adapter. People have a full understanding of the power adapter. Power adapter, however, is also a safety issue.


When we encounter safety issues with power adapters, we realize that having a qualified power adapter is more important. A good power adapter, you can play the running role of home appliances. When you have a remote control in your hand, you can use the power adapter more intelligently. A good power adapter can make your home life better. The safety of the power adapter is very important. If a power adapter is damaged, it should be replaced. A broken adapter can cause leakage from its power supply. Once there is leakage of electricity, it is very dangerous. Especially in the home of the power adapter, must choose a secure power adapter. An LED display with a power adapter fails to display. During the process of troubleshooting, the power indicator of the power adapter lights up and is confused by the phenomenon. After thorough investigation, the fault point was found at the power plug. Here is a summary of the power adapter plug hidden problems and solutions: 

1. Power adapter plug failure phenomenon


One of my colleagues had an LED monitor with a power adapter that had been working well until it suddenly stopped working one day. I see that the power indicator on the power board is on and the power adapter indicator on the monitor is on, indicating that both the power board and the power adapter are energized. The LED monitor, a year-old Samsung 22-inch model, is switched on and off by touch, which is normally less prone to problems. From the above signs, a preliminary judgment is that the display has an internal power module problem.


2. Troubleshooting of power adapter plugs


Rearrange your mind, unplug and reconnect all the cables. The power indicator in the lower right corner of the monitor lights up and goes out. Replace the 220V power socket, the display power indicator flickered once again. Is the internal contact of the board not good? Replace a new bull plug board, the power indicator at the lower right corner of the monitor still flashes, the fault is still the same. But strangely, the power adapter's power indicator is always on green, which means the monitor is powered up and the power indicator is on and there is nothing wrong with the plugboard. Unplug the DC output port again, but the display still does not respond. However, when I unplugged the ac power input, the monitor power indicator flickers to indicate that the monitor has been temporarily charged, so the problem can be basically identified on the power adapter.


3. Troubleshooting of power adapter plugs


Voltage instability is the display can not be normal power, the author measured the voltage on the bull plug board is 222V, indicating that there is a problem with this power line. Immediately the ac power line near the plug cut, plug into the 220V voltage, and then measure the other end of the voltage, the voltage is still by the change of large and small. There seems to be something wrong with the power plug. Cut a two-hole head from other electrical equipment and connect it. Measure the other end of the AC power line again. The voltage is stable at 221V.


The reason has been found. There is a problem with the ac power cord plug. Replace a 220V AC power cord plug with the power adapter, and the monitor will display normally. In this way, we can know that the ac power line quality of this power adapter is not good, especially the solder joint inside the plug is not in good contact, the resistance value is unstable, from small to large, leading to the voltage value changes from large to small.


Difference between power adapter and charger


Power adapter generally refers to transform our mains for laptops, mobile phones, indicator, routers, switches, and so on electrical appliances required for dc or low voltage ac power supply, power adapter for laptop and mobile phone charger, but for most of the other power adapter is just a power supply. Before introducing the difference between a charger and a power adapter, let's take a look at what a charger is and what a power adapter is. The power adapter manufacturers to give you a good analysis:


1. Charger:


A charger, usually a device that converts alternating current to low-voltage direct current, contains current limiting, voltage limiting and other control circuits to meet the charging characteristics. Charger is widely used in various fields, especially in the field of life is widely used in mobile phones, cameras and other common electrical appliances. It generally charges the battery directly, without going through any intermediary devices or devices. The process of charger is: constant current - constant pressure - trickling flow, third-order intelligent charging. The three-stage charging theory can greatly improve the charging efficiency, shorten the charging time and prolong the battery life. Three-stage charging adopts constant current charging, then constant voltage charging, and finally floating charging for maintenance charging.


2. Power adapter:


Most power adapters automatically detect 100 -- 240V ac (50/60 hz). Power adapter is a small portable electronic equipment and electronic electrical power supply transformation equipment, it puts the power supply outside, with a line and the host connected, so that the size and weight of the host can be reduced, only a few equipment and electrical power built in the host. It is composed of power transformer and rectifier circuit, according to its output type can be divided into AC output type and DC output type; According to the connection mode can be divided into wall type and desktop type. Each power adapter has a nameplate indicating power, input/output voltage, and current, with special attention to the range of input voltages.


With the development of science and technology, there are more and more electronic products. It is necessary for everyone to know the difference between charger and power adapter, and make sure to distinguish it before purchasing. It makes a big difference.