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EnglishThree main points of power adapter insulation
Posted by Admin | 31 Dec
Many people have heard that in the process of developing new products for switching power adapters, it is not only necessary to comprehensively consider product packaging, circuit design, heat dissipation design, and anti-electromagnetic interference issues, but also insulation shielding design is also a very important one. Design link. The following power adapter manufacturers will carefully explain the three main points of power adapter insulation. Under normal circumstances, the more common insulation shielding technologies are generally divided into the following types:
First of all, the more common insulation technology is reinforced insulation technology. This technology is one of many insulation systems to avoid electric shock, and it is functionally equivalent to double insulation. When using reinforced insulation technology for circuit design, the minimum thickness of the single layer used inside is greater than or equal to 0.4mm, so that there can be several layers of insulation protection, but each layer cannot be tested independently.
The common insulation method in China is basic insulation. This technology is the most basic insulation method to avoid electric shocks for switching power supply adapters. It is also a relatively clear insulation technology introduced in various teaching materials. This article will not go into too much detail here. However, basic insulation alone is not absolutely safe. Engineers need to pass additional insulation and protective grounding to achieve safety requirements, such as coil insulation.
Different types of circuits require different types of insulation:
1. This type of equipment adopts protective grounding, that is, the metal case is connected to the protective ground as a level 1 shield. Only basic insulation is required between any risk voltage parts and the chassis, such as station communication power supply.
2. Use double insulation and reinforced insulation, no metal chassis and grounding screws, such as portable chargers.
3. It is powered by SELV source and an external power source without potential risk voltage generation, so only basic insulation is required, such as a circuit board power supply.
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