Principle of power converter

Power converter, also known as AC converter, is a kind of transformer. Due to the different power environment of countries and regions all over the world, there are also differences in civil voltage, and the voltage application scope of electrical appliances in various countries is also different. There are two common types: 220V voltage and 110V voltage. With the rapid progress of world science and technology, folk exchanges are becoming more and more frequent, AC converter has become a necessary article for people going abroad, which brings great convenience to people’s work and life, saves money and reduces the waste of energy

Power converter is a scientific name, that is, plug-in board, also known as row plug-in board, plug-in board, wiring board, and so on. Pick up the patch panel we usually use. In addition to the product name of the power converter, there are also some electrical parameters, such as maximum voltage, maximum current, frequency, etc. When using the power converter, we should use it according to these parameters. If it is not used properly, especially when using low-quality power converter, unsafe accidents such as electric shock and fire will occur. Early domestic power converters were produced by state-owned enterprises. With the promotion of market economy, private enterprises also began to enter the power converter industry, which made the power converter industry contend.

Precautions for power converter

There are two points to note:

1. Different power products have different conversion efficiency;

2. The conversion efficiency of the same power product also changes under different working conditions.

The conversion efficiency of common AC converters is between 70% – 90%. Therefore, when purchasing AC converters, in addition to paying attention to the power of supporting appliances, the conversion efficiency of the AC converter itself should be included in the calculation. The AC converter selected according to the data obtained from this is safe to use

{gb2099.3-2008 / iec60884-2-5:1995, mod plugs and sockets for household and similar purposes Part 2: special requirements for converters}:

Converter: a mobile electrical accessory composed of a plug part and one or more socket parts as an integral unit.

Fused converter: a converter with replaceable fuses in one or more current carrying poles.

Note: the standard name of row plug with plug is converter, which belongs to power converter

Safe use of power converter

Poor quality of plugs, sockets and converters is an important cause of electrical fire. The quality problems of small plugs, sockets and converters will pose a serious harm to the personal and property safety of consumers. Therefore, when purchasing plugs, sockets, converters and switches, consumers should focus on the safety of products, and the main factors affecting their safety are the following performance indicators:


The sign is an important basis to instruct people to install, use and maintain correctly, and is an extremely important safety standard to ensure the safety of personal and property. Plug and socket products shall be marked with rated current, rated voltage, power supply nature, etc. in an obvious position. In addition, the converter (the converter refers to a mobile electrical accessory with only one plug part and one or more socket parts) product shall use the “Max” symbol to mark the rated current and / or power, so as to guide users to avoid overload. Signs or symbols shall be durable and legible. Silk screen printing and paper stickers that can be easily erased shall not be used.


The rated value is the most basic electrical exchange and coordination parameter to ensure the normal, safe and cooperative use of plugs, sockets, converters and connected electrical appliances. For example, the rated current of the converter shall not be greater than the rated value of the plug part. Otherwise, it may cause danger due to over-current heating of the plug when users select electrical appliances according to the rated current of the socket; The minimum rating of converter with fuse and overload protector shall be equal to the rating marked on fuse and overload protector. Otherwise, product damage may occur.


Size is an important technical requirement related to whether the plug, socket and converter can be used safely and meet the general interchangeability requirements to avoid misinsertion. Unqualified size will affect the user’s use or produce hidden dangers such as poor contact and misinsertion. At least, the equipment will be damaged, and at worst, fire and electric shock accidents will occur.

electric-shock safeguard

Anti electric shock protection is a key safety index to ensure that the plug, socket and converter will not cause electric shock accidents to users and others under normal use or even some accidents. When the plug and socket are fully or partially inserted, the live part of the plug shall not be accessible; Any pin of the plug shall not be connected with the live socket of the socket when other pins are accessible. Plugs, sockets and converters with protective doors shall be able to prevent single pole or probe insertion.


The socket assembly shall have enough elasticity to ensure sufficient contact pressure on the plug pin. The plug sleeve shall be corrosion-resistant and wear-resistant to ensure good contact between the plug and socket; The plug pin of the plug shall be locked and cannot rotate, otherwise it will affect the insertion performance and produce unsafe factors; The converter is equipped with a flexible wire fixing device to ensure that the flexible wire is fixed and can withstand normal tension and torque; When the plug and socket are inserted, the insertion surfaces shall be basically tight to prevent electric shock accidents.

power cord

The power line shall have sufficient cross-sectional area to ensure that the power line will not generate heat, cause insulation damage, cause short circuit, fire and leakage, and cause accidents. For example, the cross-sectional area of the power line of the common 250V, 10a converter shall be greater than or equal to 0.75mm2.

mechanical strength

The plug and socket shall have sufficient mechanical strength to withstand various mechanical stresses caused by drop, impact and extrusion during installation and use; Sockets with protective doors shall prevent single pole insertion.

Heat and flame resistance

High temperature has a great impact on various properties of insulating materials. Under high temperature conditions, the structure and characteristics of insulating materials will change essentially. This change determines the reliability of materials. Some materials will gradually become soft and the mechanical strength will decrease at high temperature, which will affect the quality of plug and socket and the safety in use. In addition, the insulation material of plug and socket shall have certain flame retardant performance. Otherwise, the product will be out of control in case of fire during use.

Understand the safety performance of plugs and sockets. When purchasing and using, grasp the following points to ensure the safety of your family and property:

First choice: choose regular shopping malls, supermarkets or specialty stores, and choose brand products; Select corresponding (matching) products according to the power of electrical appliances, such as 16A plugs and sockets for air conditioners, high-power showers and other products, and 10A plugs and sockets for other low-power household appliances.

Second, check whether the product marks are complete and whether there is CCC certification mark.

Third, check: check the certificate of conformity and the inspection report issued by the legal department. If the converter product is not included in the compulsory certification, you should check the inspection report issued by the legal inspection organization when purchasing.

Four tests: conduct a simple plug-in experiment. The plug should be in good contact after being inserted into the socket, without feeling loose, and can be pulled out without too much force.

V. attention: do not buy plugs with rotatable pins or artificially change the shape of plugs; Do not use two high-power appliances on one socket at the same time; If the temperature of the plug, socket or power cord is too high or there is ignition, it shall be stopped and replaced.

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