When in a certain environment, there must be electric leakage. Of course, static electricity of electronic products is inevitable. Just as our human body will carry static electricity in autumn and winter, when we remove chemical fibers from the body, when you wear a sweater, you often hear a "snap". If you are in the dark, you can still see small sparks on your clothes. If the power outlet is grounded, the basic power adapter or other electronic products will not have static electricity. Let's talk about several situations of electronic products with static electricity:
1、 A small amount of current inside the electronic product is conducted through the metal shell, and the human body feels that there is leakage at that time. This situation has been well solved in advanced technology. A circuit will be formed inside the electronic products, and static electricity will be well released. Therefore, it will hardly occur in special cases.
2、 The AC plug of the power adapter of the electronic product is not well grounded. If electric leakage occurs when contacting electronic products, you can also do a simple test yourself. It connects wires to the earth. Of course, you can also find an indoor drain pipe and connect a wire from the drain pipe to the shell of the metal part of the electronic product, so that the static electricity on the shell of the electronic product can be effectively introduced to the ground and released. When replacing electronic accessories, touching the floor card by hand may damage the accessories. Static electricity of human body will cause abnormal operation of display or printer. Therefore, it is best to mold the surrounding metal objects to release the static electricity on your hands. It is best to wear something that is not easy to generate static electricity. Shoes and clothes.
3、 In fact, when you touch the positive part of the DC power supply of the power adapter with wet hands and the human body also touches the wet ground, the greater the DC voltage, the more obvious the numb electric shock Under normal circumstances, this situation will not be encountered, and the ground and hands will not be particularly wet And also barefoot on the wet ground to contact the positive part of the DC power output from the power adapter And even if it is safe, it must be prompted, do not imitate!
What we mentioned above is the electrostatic phenomenon of ordinary power adapter, not ac shock. In addition to static electricity, there is another technical parameter in the terminology of electronic technology, namely leakage current, also known as leakage current.
In household appliances, leakage current refers to the safe current between the operating electrical part and the insulated metal. The leakage current of the appliance used for 220V AC is 0.25ma. This safety leakage current is very small. Leakage current refers to the current formed by surrounding medium or insulating surface between mutually insulated metal parts or between live parts and grounding parts when voltage is applied to the fault in the absence of voltage, which is called leakage current. There are four types of leakage current., They are: semiconductor component leakage current, power supply leakage current, capacitor leakage current and filter leakage current.
If the power adapter or other electronic products have unsafe static electricity, electric shock beyond the safe leakage voltage, or feel unsafe leakage current, yongletong suggests that it should stop using and contact the manufacturer to find out the specific reasons for the situation that ordinary consumers cannot identify.
In addition to the static electricity and leakage current within the scope of the charger safety standards described above, there is also AC leakage caused by non safety power adapter, which is very dangerous. In order to save cost, many safety components are removed from the non safety power adapter. Equipment, such power adapter will conduct radiation, and many other safety standards are completely inconsistent. Non safety products have potential safety hazards. Non safety switching power supply is dusty, humid, high temperature and lightning. Short circuit is easy to occur under vibration, vibration and other conditions. Once short circuit occurs, non safety power supply is very easy to cause electric shock and fire; It is strongly recommended that customers carefully select non safety power supply for their own brand reputation and the personal and property safety of end customers, so as to avoid irreparable losses
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