source:Industry News Popular:adapter release time:2022-05-05 09:39:01 Article author:yu
The choice of accessories for the power adapter is an important link that is directly related to product quality and sales. However, in the safety design of the product, how should the key components of the power adapter be selected to take into account cost and quality? This article will interpret the key component selection requirements of Class II and Class I power adapters.
No matter what type of power adapter it is, the three key components of power source transformer, isolation capacitor and optocoupler need to be treated carefully. These three components will be connected across the primary circuit and the secondary circuit, which can directly affect the safety performance of the power adapter. For Class II power adapters, power transformers, isolation capacitors and optocouplers should meet the requirements of reinforced insulation, that is, the creepage distance and clearance between the primary and secondary (or between the primary circuit and the secondary circuit) It should reach more than 6.0mm, and the insulation penetration distance should reach more than 0.4mm, so that the safety of the whole system can be fully guaranteed. Moreover, the experiment between the primary and secondary can withstand the dielectric strength of 3000VAC or 4242VDC without breakdown or arcing, which is a rigid requirement for the stability of the system. Therefore, power transformers, isolation capacitors and optocouplers are best used. Related products that have undergone national safety certification to ensure that they meet the requirements.
For Class I power adapters, although grounding can provide safety protection, and components such as power transformers can meet the requirements of basic insulation, from the actual situation, it is still recommended to select components that meet the requirements of reinforced insulation. Moreover, from an economic point of view, selecting components that meet the requirements will not cause a significant increase in product cost, and meets the cost control requirements.
In addition to the above suggestions for the selection of the key components of the two power adapters, the plastic shell is also one of the important components of the power adapter. Its safety is mainly reflected in the fire performance, and it should be tested through the relevant combustion test whether it meets the standard requirements. .
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