What material is the power adapter? What are the characteristics of the power adapter?

The power adapter shell is usually made of plastic materials, of course, some industrial power supplies use metal shells. The materials of our common power adapter shells are mainly ABS materials, ABS + PC materials, and pure PC materials. In general, we only use these three materials. Let's introduce one by one the differences between these materials.

PC material
Pure PC material has ultra-high strength and elasticity coefficient, and a wide temperature range (ABS general materials can only be used at -25 degrees to 60 degrees). In addition, PC materials have high transparency and free dyeability. It is very good to make the power adapter in various colors. In addition, this material has fatigue resistance, weather resistance, tasteless and odorless, which is harmless to the human body and is in line with hygiene and safety.

ABS material
ABS material characteristics, first of all, low strength and temperature resistance, under normal circumstances, the maximum temperature can not exceed 60 degrees Celsius, which is much worse than PC materials, ABS is generally used in household appliances.

ABS and PC composite material
Taking the characteristics of the former two, it has excellent molding performance, good fluidity and high strength. The ABS + PC material is easy to process, and has good dimensional stability and surface gloss. It is easy to paint and color, and it can also be used for secondary processing such as metal spraying, electroplating, welding and bonding. Due to the characteristics of ABS combined with the characteristics of its three components, it has excellent comprehensive performance and has become one of the preferred plastics for electrical components, home appliances, computers and instruments.

The choice of the power adapter shell material is basically based on pure PC materials and PC + ABS. Although the cost will increase compared with before, the power adapter price will also be different, but from the environmental protection and safety Say, ABS is more and more unmatched with the current market demand! Therefore, power adapter manufacturers remind you that when you choose a 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 bulky power frequency transformers. Since the dissipated power on the switching MOS tube is greatly reduced, a larger heat sink is omitted. For these two reasons, the switching power adapter is small and light.

2. Low power consumption and high efficiency. In the Switching Power Supply adapter circuit, under the excitation of the excitation signal, the switching MOS tube works alternately in the on-off and off-on switching state, the conversion speed is very fast, and the frequency is generally above 50kHz. In some advanced switches In the power line, it can be several hundred or nearly trillion Hz. This makes the power consumption of the switching MOS tube very small, the efficiency of the Power Supply can be greatly improved, and its efficiency can reach 90%.

3. The efficiency of filtering is greatly improved, and the capacity and volume of the filtering capacitor are greatly reduced. The working frequency of the switching power supply adapter is basically working above 50kHz, which is more than 1000 times that of the linear regulated power supply adapter, which makes the filtering efficiency after rectification almost increased by 1000 times; The efficiency has also increased by 500 times. Under the same ripple output voltage, the capacity of the filter capacitor is only 1/500 ~ 1/1000 of the filter capacitor in the linear regulated power supply when the switching power supply is used.

4. Wide voltage range. The output voltage of the switching power supply adapter is adjusted by the duty cycle of the excitation signal, and the change of the input signal voltage can be compensated by frequency modulation or width adjustment. In this way, when the power frequency grid voltage changes greatly, it can still guarantee a more stable output voltage. Therefore, the voltage stabilizing range of the switching power adapter is wide, and the voltage stabilizing effect is very good. In addition, there are two methods of changing the duty ratio: pulse width modulation type and frequency modulation type. The switching power supply not only has the advantages of a wide range of voltage regulation, but also has many methods to achieve voltage regulation. Designers can flexibly choose various types of switching power supply integrated circuit chip solutions according to the requirements of actual applications.

Best regards,

Ada Zheng