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What is the power adapter and what are the features of the power adapter?
time2007/01/08
- Power adapters have been widely used in people's lives, but a variety of power adapters of varying quality are also flowing to the market, but I don't know how much you know about the power adapter housing material.
Power adapter material
Power adapters have been widely used in people's lives, but a variety of power adapters of different quality are also flowing to the market, but I don't know how much you know about the power adapter housing material. Next, let me introduce the power adapter housing. Material differences, we can understand some of these related information, and can also avoid some security risks to a large extent!
The power adapter housing is generally made of a plastic material. Of course, some industrial power supplies use a metal casing. The materials of our common power adapter housings are mainly ABS material, ABS+PC material, and pure PC material. In general, we only use these three materials. Let's take a look at the differences between these materials.
PC material
Pure PC material has ultra-high strength and elastic coefficient, and has a wide temperature range. (ABS general material can only be used at -25 to 60 degrees), and PC material has high transparency and free dyeability. The power adapter is very good in various colors. In addition, this material is also resistant to fatigue, weather, odorless and odorless, and is hygienic and safe.
ABS material
ABS material features, first of all, low strength, not temperature, under normal circumstances, the maximum temperature can not exceed 60 degrees Celsius, which is a lot worse than PC material, ABS is generally used in household appliances.
ABS and PC synthetic materials
Taking the characteristics of the former two, it has excellent molding processing performance, good fluidity and high strength. ABS+PC material is easy to process, has good dimensional stability and surface gloss, is easy to apply, color, and can be used for secondary processing such as metal spraying, plating, welding and bonding. Because the characteristics of ABS combines 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 instrumentation.
In the selection of the power adapter housing material, basically based on pure PC material and PC + ABS, although the cost will increase before the comparison, the price of the power adapter will be different, but from the environmental protection and safety Said, ABS is increasingly not matching the current market demand! So the power adapter manufacturers remind, when you choose the power adapter, try to choose a large manufacturer to buy!
Power adapter features
1. Small size and light weight. The switching power adapter does not use a bulky power frequency transformer. Since the power dissipation on the switching MOS tube is greatly reduced, a large heat sink is omitted. For these two reasons, the switching power adapter is small in size and light in weight.
2. Low power consumption and high efficiency. In the switching power adapter circuit, the switching MOS transistor is excited under the excitation signal, and it alternately operates in the on-off and off-on-conduction state, the conversion speed is fast, the frequency is generally above 50 kHz, in some advanced switches. In the power line, it can be hundreds or nearly mega Hz. This makes the power consumption of the switching MOS transistor small, the efficiency of the power supply can be greatly improved, and the efficiency can reach 90%.
3. The efficiency of filtering is greatly improved, so that the capacity and volume of the filter capacitor are greatly reduced. The operating frequency of the switching power adapter is basically working above 50kHz, which is more than 1000 times that of the linear regulated power adapter. This makes the filtering efficiency after rectification almost 1000 times. Even after half-wave rectification and capacitor filtering, The efficiency has also increased by 500 times. At the same ripple output voltage, when using a switching power supply, the capacity of the filter capacitor is only 1/500 to 1/1000 of the filter capacitor in the linear regulated power supply.
4. Wide voltage regulation range. The output voltage of the switching power adapter is regulated by the duty cycle of the excitation signal, and the change in the input signal voltage can be compensated by frequency modulation or widening. In this way, when the voltage of the power frequency grid changes greatly, it can still ensure a relatively stable output voltage. Therefore, the switching power supply adapter has a wide voltage regulation range and the voltage regulation effect is very good. In addition, methods for changing the duty ratio include pulse width modulation type and frequency modulation type. The switching regulator power supply not only has the advantage of wide voltage regulation range, but also has many methods for realizing voltage regulation. Designers can flexibly select various types of switching power supply integrated circuit chip solutions according to the requirements of practical applications.