What is the power adapter made of? What are the features of the power adapter?
Power adapters have been widely used in people's life, but a variety of different quality power adapters are also a large number of market, but I do not know how much you know about the power adapter shell material? Next to introduce the power adapter shell material differences, we know more about some of the relevant information, but also to a large extent to avoid some security risks!
The power adapter shell is generally made of
plastic material, of course, some industrial power USES a metal shell. We
generally common material of the power adapter shell, mainly ABS material,
ABS+PC material, pure PC material. In general, we only use these three
materials, let's introduce the difference between these materials.
The power adapter shell is generally made of plastic material, of course, some industrial power USES a metal shell. We generally common material of the power adapter shell, mainly ABS material, ABS+PC material, pure PC material. In general, we only use these three materials, let's introduce the difference between these materials.
Composite material of ABS and PC
Take the characteristics of the above two, with excellent molding performance, good fluidity, high strength. ABS+PC material is easy to process, the processing size stability and the surface gloss is good, easy to paint, coloring, can also be sprayed metal, plating, welding and bonding and other secondary processing performance. Because the characteristics of ABS are combined with the characteristics of its three components, it has excellent comprehensive performance and becomes one of the preferred plastics for electrical components, home appliances, computers and instruments.
In the choice of the material of the power adapter shell, it is basically based on pure PC material and PC+ABS. Although there will be a rise in the cost compared with before, the price of the power adapter will be different, but from the point of view of environmental protection and safety, ABS is less and less matched to the current market demand! So power adapter manufacturers remind, when you choose the power adapter, as far as possible to choose a large manufacturer to buy!
Power adapter features
2. Low power consumption and high efficiency. In the switching power adapter circuit, the switching MOS tube is excited by the excitation signal, and it works alternately in the on-off and stop-off switching states. The switching speed is very fast, and the frequency is generally more than 50kHz. This makes the power consumption of the switching MOS tube very small, and the efficiency of the power supply can be greatly improved, the efficiency can reach 90%.
3. The efficiency of filtering is greatly improved, and the capacity and volume of filtering capacitor are greatly reduced. At present, the working frequency of the switching power adapter is basically more than 50kHz, which is more than 1000 times that of the linear voltage regulator power adapter. Even with half - wave rectification and capacitor filtering, the efficiency is increased by 500 times. At the same ripple output voltage, the capacity of the filter capacitor is only 1/500 ~ 1/1000 of that of the filter capacitor in the linear stabilized power supply when the switching power supply is used.
4. Wide range of voltage regulation. The output voltage of the switching power adapter is regulated by the duty cycle of the excitation signal. In this way, when the power frequency network voltage changes greatly, it can still ensure a more stable output voltage. So the switching power adapter voltage range is very wide, voltage regulation effect is very good. In addition, there are two methods to change duty cycle: pulse width modulation and frequency modulation. Switching voltage stabilizing power supply not only has the advantages of wide voltage stabilizing range, but also has many methods to achieve voltage stabilizing, designers can flexibly choose various types of switching power supply IC chip schemes according to the requirements of practical applications.