High-quality power adapter to ensure the safety of people's electricity

　　Nowadays, there are power adapters of various specifications and prices on the market, and the quality of the products is also uneven. Concerning the safety of power adapters, low-quality power supplies can even cause fires and explosions, seriously endangering people's lives. So how should we choose when purchasing a power adapter?

　　1. Today the power adapter manufacturer will analyze some quality problems of the power adapter:

　　1. The power plug of the 24V power adapter is not standardized:

　　my country stipulates that household single-phase power plugs have two-pole non-grounding and two-pole grounding. The power plug shown should be able to prevent single-pole insertion during use, that is, when any plug of the plug is inserted into the live socket of the socket, Other pins cannot be in an easily accessible state. In the spot check, it was found that the plug is too long, which increases the risk of electric shock for the user during the plugging and unplugging process. In addition, the shape of power plugs that do not meet the requirements is more common. Because these plugs are not compatible with the sockets used in our country, it is also very easy to cause electric shock to users.

　　2. Incomplete or irregular product marking:

　　The mark should contain important information that guides the user in the correct installation and use. Correctly marking the product's mark is one of the basic measures to ensure the user's personal and property safety. The mark shall be durable and eye-catching. The mark shall not fall off after normal use, and the content shall be clean and identifiable. Products sold in China are required to be marked in simplified Chinese and should contain at least the following information: the name, trademark or identification mark of the manufacturer or distributor; the model code or model specification; the nature of the power supply; the rated power supply voltage range. If the information is not complete, the consumer cannot be correctly guided to use it, and some may even be misused to damage the electronic equipment connected to it. The common problems are no Chinese logo, no factory name or trademark, model code or model specification, etc.

　　3. Heating under normal working conditions does not meet the requirements:

　　The function of the power adapter is to convert the voltage. In the process of voltage conversion, some electrical energy needs to be consumed due to losses. After the electrical energy is converted into heat energy, a part of the heat energy is dissipated to the surrounding environment through radiation, convection, and conduction, and the other part of the heat energy is dissipated by itself. Absorb, increase the temperature of the power adapter. The heat resistance law of insulating materials shows that when the internal temperature of the equipment rises to a certain temperature, it will cause the rapid aging of the insulating materials, shorten the test life of the product, and reduce the safety performance. Therefore, only when the temperature of the power adapter is controlled within an appropriate range during normal operation can it be guaranteed to work safely and normally. In the supervision and spot check, it was found that under normal working conditions of some products, the temperature rise of the printed circuit boards and transformer windings in the products is too high, which poses greater safety risks. As a consumer, you should pay close attention to the temperature rise of the product during use. The easiest way is to test the temperature rise of the product shell during use. The difference between the shell temperature of the power adapter and the ambient temperature cannot exceed 60°C, even in the hot In summer, the ambient temperature reaches 35°C, and the temperature of the shell cannot exceed 95°C. If the temperature rise of the product is found to be too high, we should stop using it in time.

　　4. The product has potential safety performance hazards during short circuit and overload:

　　Under the condition of output short circuit, short circuit of components such as capacitors or diodes, the internal loss of the power adapter increases sharply, causing the temperature rise of various parts to rise. The design and application of electronic circuits should ensure that under abnormal working and fault conditions, the temperature rise of each part of the product cannot exceed the specified requirements, and it should not cause the surrounding objects to have a fire hazard. The power adapter can be damaged under fault conditions, but it cannot Reduce the safety performance of the equipment.

　　Second, the difference between high-quality scanner power adapter and inferior power adapter

　　①. The difference between the above-mentioned high-quality power adapter and inferior power adapter is, for example, high-quality power adapter, internal electronic components are of good quality, high accuracy, output voltage, current accuracy, and stability.

　　②. Inferior power adapters are far worse, for example: component supply parameters are not standardized, output voltage and current are unstable, and so on.

　　Third, choose a power adapter, which is more important, price or quality

　　Although price is not necessarily directly proportional to quality, you get what you pay for. If the price is high, the design, processing, and materials of the product will naturally be better, and the low price will naturally have its costs secretly reduced. When an experienced buyer negotiates with a supplier, he will not over-press the price, because he knows that the price that is forcibly suppressed will eventually result in a product that cut corners. Except for power products with premium brands such as Apple power adapters, the prices of power adapters from most regular manufacturers are relatively transparent.

　　Combining the characteristics of power adapter products and the laws of the market, you will know how to choose when purchasing a power adapter. Should I choose a cheap knockoff product with unknown quality, or a more expensive power supply with guaranteed quality. Inferior power adapters bring not only endless after-sales problems, poor consumer experience, but also unknown safety hazards. Therefore, the power adapter would rather choose the expensive one than the bad one.

　　4. Which aspects are used to identify the quality of the power adapter?

　　We can quickly identify it from four aspects. First, take a domestic example. First, check whether the CCC certificate of the switching power supply is valid; second, carefully check the label of the power adapter; third, check the interface and plug of the power adapter.

　　The control of power adapters in our country belongs to the scope of the national compulsory certification catalog. Therefore, the regular power adapters circulating in the domestic market have passed the national compulsory certification. When we buy the power adapter, we first look at the nameplate indicating whether the CCC logo is printed. In addition, we can check the certificate model of the product online Wait, if the product has passed CCC certification, then we can choose this power adapter.

　　When the first step is completed, we look at the interface and plug of the power adapter. First, make sure that the size of the DC head is consistent with the device you are using. This is the most basic. If the size does not match, then there is no way to use it. Then See if the DC head is loose, because if the interface of the power adapter is unstable, the current of the whole machine will be unstable, which will damage the equipment and cause a safety accident.

　　The last point, look at the label of the switching power supply. In fact, this point is similar to the first point, but what we confirm is the parameter. All the information of a qualified power adapter will be indicated on the nameplate, such as voltage, current, energy efficiency, and safety. Description, manufacturer, etc. Of course, if you are only using it in China, it must be marked in Chinese, and the information will be very complete.

Read recommendations:

Dc Power Supply 12v 2A 5V 20A switching power supply pcb design

18W European standard Power Adapter

30W power amplifier power supply

Recommended Method for Switching Power Supply Problem

Power adapter manufacturers: Notes on charging the balance car.the power adapter