Power adapter is a small portable electronic devices and electronic Power supply Power transformation equipment, generally consists of shell, transformer, inductance, capacitance, control components such as IC, PCB, it works by converting ac input dc output;According to the connection mode can be divided into the plug wall and desktop type.Used in security cameras, set-top boxes, routers, article lamp, massager, and other equipment.
Power adapter, also called external power supply, a small portable electronic devices and electronic power supply voltage transformation equipment, common in mobile phones, LCD display,laptop computers and other small electronic products.
Directions for use
As shown in the figure, in the power adapter (hereinafter referred to as adapter) above the label usually need to pay attention to several items.The first is the adapter model, such as the adapter model is IVF-120100, it tells us a few information,that is, its manufacturer, the main parameters, XVE at the beginning of the general # # company code, 120100 is to explain this adapter is 12W, 050200 is 10W; the second is the adapter INPUT, generally in China is 100-240V ~ 50-60Hz, which shows that the adapter can be 100V-240V voltage below the normal work; The third is the adapter OUTPUT (output), the two figures can be very fast to calculate the wattage of the adapter, such as the adapter, voltage 12V * current 1A = 12W (power), indicating that the power is 12W adapter.
Most laptop power adapters can be used for 100 ~ 240V AC (50 / 60Hz). Basically, most of the notebook computers are external power supply, with a power cord and the host connection, which can reduce the size and weight of the host, only a very small number of models built in the host power. In the power adapter has a nameplate, marked above the power, input and output voltage and current and other indicators, with particular attention to the input voltage range, which is the so-called "travel power adapter", if the city voltage to only 110V country , This feature is very useful, and some parallel notebook computers are sold only in the origin, there is no such compatible voltage design, or even only a single 110V input voltage, in our 220V mains voltage will be burned
First, the power adapter (hereinafter referred to as the power) of the nominal voltage and current What does this mean? First of all, the general power of the nominal voltage, refers to the open circuit output voltage, that is, do not take any load outside, there is no current output voltage, it can be understood that this voltage is the upper limit of the power output voltage.
For the internal use of the active power regulator components, even if the mains voltage fluctuates, the output is also a constant value, like the market generally small transformers, such as portable with the type of power supply, if the electricity fluctuations, The output of the power supply will not fluctuate.
Generally speaking, the true no-load voltage of the ordinary power adapter is not necessarily the same as the nominal voltage, because the characteristics of electronic components can not be completely consistent, so there is a certain error, the smaller the error, the higher the consistency of electronic components , The cost of production is high, so the price is more expensive.
In addition, the nominal current value, regardless of any power supply has a certain internal resistance, so when the power output current, the internal pressure drop will occur, resulting in two things, one is to generate heat, so the power will be hot, and the other One is to cause the output voltage to drop, which is equivalent to the internal consumption.
Second, are the same nominal voltage power supply, the output current is different, can not be used in the same laptop?
Power supply voltage is same, the output current is different, can not be used in the same laptop. The basic principle is that the large nominal current supply can replace the small nominal current supply. It is estimated that some people would like to think that a large nominal current power will burn laptop, because of the big current. Real circumstances depends on the load, Oh, think of junior high school physics will know. When the laptop of high-load operated, the current is larger, the laptop came into the standby time, the current is smaller, large current power supply has enough current margin. On the contrary, some people use 56w power supply instead of 72w with no problem, because the power adapter is usually designed to leave a certain margin, the load power should be less than the power supply, so this replacement is generally feasible in the general use, But the remaining power supply power margin is very small, once your laptop took a lot of peripherals, such as two usb hard drive, and then cpu full speed operation, and then a base, above a CD-ROM to read the disk at full speed, plus at the same time to charge the battery, it is estimated that the danger, and at any time to touch your power is not already boiled eggs. So it is best not to use a small current instead of high current power supply.
Three, exactly the same machine, others power are warm, and It always hot, why?
First of all,it is known that the power supply to the laptop and the battery power supply to the notebook is different.
Battery-powered, the battery output is pure DC, very clean, the battery voltage is neither possible nor need to design a high, lithium battery chemical properties determine a cell output voltage can only be about 3.6V, so many batteries are used in three cascade way, 10.8V also became very popular battery voltage. Some batteries are slightly larger than the integer value of 3.6V, such as 3.7V or 11.2V, etc., in fact, to protect the battery.
Power supply, the situation is more complex, first of all need to add voltage to further regulation filter to ensure that the power performance is not very good in the case of stable operation, the voltage regulator is divided into two parts, all the way to the work of the power supply, The other way to charge the battery to the part of the power supply to the battery when the same power supply, and to charge the battery that part of the need to charge the battery through the battery control circuit can be added to the battery, the control circuit can be very complex, so the power supply voltage Must be greater than the cell voltage to have sufficient capacity to supply the charge control circuit to the unit. Finally the voltage actually added to the cell will never be the nominal voltage of your power supply. Rest assured.
A suitable power adapter is required to have safety certification, safety certification of the power adapter can protect the safety of the person. Play to prevent electric shock, fire and other hazards
Power Supply Purpose
Switching power supply products are widely used in industrial automation and control, military equipment, scientific research equipment, LED lighting, industrial equipment, communications equipment, electrical equipment, instrumentation, medical equipment, semiconductor refrigeration heating, air purifier, electronic refrigerator, Lighting, communications equipment, audio-visual products, security, computer chassis, digital products and equipment, and other fields.